1 /* ldexp.h - 2 Copyright (C) 1991-2018 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 hidden; 70 } assign; 71 struct { 72 node_type type; 73 union etree_union *child; 74 } unary; 75 struct { 76 node_type type; 77 const char *name; 78 } name; 79 struct { 80 node_type type; 81 bfd_vma value; 82 char *str; 83 } value; 84 struct { 85 node_type type; 86 asection *section; 87 bfd_vma value; 88 } rel; 89 struct { 90 node_type type; 91 union etree_union *child; 92 const char *message; 93 } assert_s; 94 } etree_type; 95 96 /* Expression evaluation control. */ 97 typedef enum 98 { 99 /* Parsing linker script. Will only return "valid" for expressions 100 that evaluate to a constant. */ 101 lang_first_phase_enum, 102 /* Prior to section sizing. */ 103 lang_mark_phase_enum, 104 /* During section sizing. */ 105 lang_allocating_phase_enum, 106 /* During assignment of symbol values when relaxation in progress. */ 107 lang_assigning_phase_enum, 108 /* Final assignment of symbol values. */ 109 lang_final_phase_enum 110 } lang_phase_type; 111 112 union lang_statement_union; 113 114 enum phase_enum { 115 /* We step through the first four states here as we see the 116 associated linker script tokens. */ 117 exp_seg_none, 118 exp_seg_align_seen, 119 exp_seg_relro_seen, 120 exp_seg_end_seen, 121 /* The last three states are final, and affect the value returned 122 by XXX_SEGMENT_ALIGN. */ 123 exp_seg_relro_adjust, 124 exp_seg_adjust, 125 exp_seg_done 126 }; 127 128 enum relro_enum { 129 exp_seg_relro_none, 130 exp_seg_relro_start, 131 exp_seg_relro_end, 132 }; 133 134 typedef struct { 135 enum phase_enum phase; 136 137 bfd_vma base, relro_offset, relro_end, end, pagesize, maxpagesize; 138 139 enum relro_enum relro; 140 141 union lang_statement_union *relro_start_stat; 142 union lang_statement_union *relro_end_stat; 143 } seg_align_type; 144 145 struct ldexp_control { 146 /* Modify expression evaluation depending on this. */ 147 lang_phase_type phase; 148 149 /* Principally used for diagnostics. */ 150 bfd_boolean assigning_to_dot; 151 152 /* Set if the current expression used "dot", SEGMENT_START or 153 ORIGIN, but not ABSOLUTE or combined symbols in a way that forces 154 an absolute result. Used in tracking symbols assigned from dot 155 outside of output section statements, in order to later convert 156 them from absolute. */ 157 bfd_boolean rel_from_abs; 158 159 /* If evaluating an assignment, the destination. Cleared if an 160 etree_name NAME matches this, to signal a self-assignment. 161 Note that an etree_name DEFINED does not clear this field, nor 162 does the false branch of a trinary expression. */ 163 const char *assign_name; 164 165 /* If evaluating an assignment, the source if it is an expression 166 referencing single etree_name NAME, or a trinary expression where 167 the true branch references a single etree_name NAME. */ 168 struct bfd_link_hash_entry *assign_src; 169 170 /* Working results. */ 171 etree_value_type result; 172 bfd_vma dot; 173 174 /* Current dot and section passed to ldexp folder. */ 175 bfd_vma *dotp; 176 asection *section; 177 178 /* State machine and results for DATASEG. */ 179 seg_align_type dataseg; 180 }; 181 182 extern struct ldexp_control expld; 183 184 /* A maps from a segment name to a base address. */ 185 typedef struct segment_struct { 186 /* The next segment in the linked list. */ 187 struct segment_struct *next; 188 /* The name of the sgement. */ 189 const char *name; 190 /* The base address for the segment. */ 191 bfd_vma value; 192 /* True if a SEGMENT_START directive corresponding to this segment 193 has been seen. */ 194 bfd_boolean used; 195 } segment_type; 196 197 /* The segments specified by the user on the command-line. */ 198 extern segment_type *segments; 199 200 typedef struct _fill_type fill_type; 201 202 etree_type *exp_intop 203 (bfd_vma); 204 etree_type *exp_bigintop 205 (bfd_vma, char *); 206 etree_type *exp_relop 207 (asection *, bfd_vma); 208 void exp_fold_tree 209 (etree_type *, asection *, bfd_vma *); 210 void exp_fold_tree_no_dot 211 (etree_type *); 212 etree_type *exp_binop 213 (int, etree_type *, etree_type *); 214 etree_type *exp_trinop 215 (int,etree_type *, etree_type *, etree_type *); 216 etree_type *exp_unop 217 (int, etree_type *); 218 etree_type *exp_nameop 219 (int, const char *); 220 etree_type *exp_assign 221 (const char *, etree_type *, bfd_boolean); 222 etree_type *exp_defsym 223 (const char *, etree_type *); 224 etree_type *exp_provide 225 (const char *, etree_type *, bfd_boolean); 226 etree_type *exp_assert 227 (etree_type *, const char *); 228 void exp_print_tree 229 (etree_type *); 230 bfd_vma exp_get_vma 231 (etree_type *, bfd_vma, char *); 232 int exp_get_value_int 233 (etree_type *, int, char *); 234 fill_type *exp_get_fill 235 (etree_type *, fill_type *, char *); 236 bfd_vma exp_get_abs_int 237 (etree_type *, int, char *); 238 void ldexp_init (void); 239 void ldexp_finalize_syms (void); 240 void ldexp_finish (void); 241 242 #endif 243