1 /* This file is tc-arm.h 2 Copyright (C) 1994-2014 Free Software Foundation, Inc. 3 Contributed by Richard Earnshaw (rwe (at) pegasus.esprit.ec.org) 4 Modified by David Taylor (dtaylor (at) armltd.co.uk) 5 6 This file is part of GAS, the GNU Assembler. 7 8 GAS 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 3, or (at your option) 11 any later version. 12 13 GAS 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. 17 18 You should have received a copy of the GNU General Public License 19 along with GAS; see the file COPYING. If not, write to the Free 20 Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA 21 02110-1301, USA. */ 22 23 #define TC_ARM 1 24 25 #ifndef TARGET_BYTES_BIG_ENDIAN 26 #define TARGET_BYTES_BIG_ENDIAN 0 27 #endif 28 29 #define WORKING_DOT_WORD 30 31 #define COFF_MAGIC ARMMAGIC 32 #define TARGET_ARCH bfd_arch_arm 33 34 #define DIFF_EXPR_OK 35 36 #ifdef LITTLE_ENDIAN 37 #undef LITTLE_ENDIAN 38 #endif 39 40 #ifdef BIG_ENDIAN 41 #undef BIG_ENDIAN 42 #endif 43 44 #define LITTLE_ENDIAN 1234 45 #define BIG_ENDIAN 4321 46 47 struct fix; 48 49 #if defined OBJ_AOUT 50 # if defined TE_RISCIX 51 # define TARGET_FORMAT "a.out-riscix" 52 # elif defined TE_LINUX 53 # define ARM_BI_ENDIAN 54 # define TARGET_FORMAT "a.out-arm-linux" 55 # elif defined TE_NetBSD 56 # define TARGET_FORMAT "a.out-arm-netbsd" 57 # else 58 # define ARM_BI_ENDIAN 59 # define TARGET_FORMAT (target_big_endian ? "a.out-arm-big" : "a.out-arm-little") 60 # endif 61 #elif defined OBJ_AIF 62 # define TARGET_FORMAT "aif" 63 #elif defined OBJ_COFF 64 # define ARM_BI_ENDIAN 65 # if defined TE_PE 66 # if defined TE_EPOC 67 # define TARGET_FORMAT (target_big_endian ? "epoc-pe-arm-big" : "epoc-pe-arm-little") 68 # elif defined TE_WINCE 69 # define TARGET_FORMAT (target_big_endian ? "pe-arm-wince-big" : "pe-arm-wince-little") 70 # else 71 # define TARGET_FORMAT (target_big_endian ? "pe-arm-big" : "pe-arm-little") 72 # endif 73 # else 74 # define TARGET_FORMAT (target_big_endian ? "coff-arm-big" : "coff-arm-little") 75 # endif 76 #elif defined OBJ_ELF 77 # define ARM_BI_ENDIAN 78 # define TARGET_FORMAT elf32_arm_target_format () 79 #endif 80 81 /* We support double slash line-comments for compatibility with the ARM AArch64 Assembler. */ 82 #define DOUBLESLASH_LINE_COMMENTS 83 84 /* We conditionally support labels without a colon. */ 85 #define LABELS_WITHOUT_COLONS codecomposer_syntax 86 extern bfd_boolean codecomposer_syntax; 87 88 #define tc_symbol_chars arm_symbol_chars 89 extern const char arm_symbol_chars[]; 90 91 #define TC_FORCE_RELOCATION(FIX) arm_force_relocation (FIX) 92 93 extern unsigned int arm_frag_max_var (struct frag *); 94 #define md_frag_max_var arm_frag_max_var 95 96 #define md_relax_frag(segment, fragp, stretch) \ 97 arm_relax_frag (segment, fragp, stretch) 98 extern int arm_relax_frag (asection *, struct frag *, long); 99 100 #define md_optimize_expr(l,o,r) arm_optimize_expr (l, o, r) 101 extern int arm_optimize_expr (expressionS *, operatorT, expressionS *); 102 103 #define md_cleanup() arm_cleanup () 104 105 #define md_start_line_hook() arm_start_line_hook () 106 107 #define TC_START_LABEL_WITHOUT_COLON(c, l) tc_start_label_without_colon (c, l) 108 extern bfd_boolean tc_start_label_without_colon (char, const char *); 109 110 #define tc_frob_label(S) arm_frob_label (S) 111 112 /* We also need to mark assembler created symbols: */ 113 #define tc_frob_fake_label(S) arm_frob_label (S) 114 115 #ifdef OBJ_ELF 116 #define md_end arm_md_end 117 extern void arm_md_end (void); 118 bfd_boolean arm_is_eabi (void); 119 #endif 120 121 /* NOTE: The fake label creation in stabs.c:s_stab_generic() has 122 deliberately not been updated to mark assembler created stabs 123 symbols as Thumb. */ 124 125 #define TC_FIX_TYPE int 126 #define TC_INIT_FIX_DATA(FIX) ((FIX)->tc_fix_data = 0) 127 128 /* We need to keep some local information on symbols. */ 129 130 #define TC_SYMFIELD_TYPE unsigned int 131 #define ARM_GET_FLAG(s) (*symbol_get_tc (s)) 132 #define ARM_SET_FLAG(s,v) (*symbol_get_tc (s) |= (v)) 133 #define ARM_RESET_FLAG(s,v) (*symbol_get_tc (s) &= ~(v)) 134 135 #define ARM_FLAG_THUMB (1 << 0) /* The symbol is a Thumb symbol rather than an Arm symbol. */ 136 #define ARM_FLAG_INTERWORK (1 << 1) /* The symbol is attached to code that supports interworking. */ 137 #define THUMB_FLAG_FUNC (1 << 2) /* The symbol is attached to the start of a Thumb function. */ 138 139 #define ARM_IS_THUMB(s) (ARM_GET_FLAG (s) & ARM_FLAG_THUMB) 140 #define ARM_IS_INTERWORK(s) (ARM_GET_FLAG (s) & ARM_FLAG_INTERWORK) 141 142 #ifdef OBJ_ELF 143 144 /* For ELF objects THUMB_IS_FUNC is inferred from 145 ARM_IS_THUMB and the function type. */ 146 #define THUMB_IS_FUNC(s) \ 147 ((s) != NULL \ 148 && ((arm_is_eabi () \ 149 && (ARM_IS_THUMB (s)) \ 150 && (symbol_get_bfdsym (s)->flags & BSF_FUNCTION)) \ 151 || (ARM_GET_FLAG (s) & THUMB_FLAG_FUNC))) 152 153 #define ARM_IS_FUNC(s) \ 154 (((s) != NULL \ 155 && arm_is_eabi () \ 156 && !(ARM_IS_THUMB (s)) \ 157 /* && !(THUMB_FLAG_FUNC & ARM_GET_FLAG (s)) \ */ \ 158 && (symbol_get_bfdsym (s)->flags & BSF_FUNCTION))) 159 160 161 #else 162 163 #define THUMB_IS_FUNC(s) ((s) && ARM_GET_FLAG (s) & THUMB_FLAG_FUNC) 164 #define ARM_IS_FUNC(s) (!THUMB_IS_FUNC (s) \ 165 && (s) && (symbol_get_bfdsym (s)->flags & BSF_FUNCTION)) 166 #endif 167 168 #define ARM_SET_THUMB(s,t) ((t) ? ARM_SET_FLAG (s, ARM_FLAG_THUMB) : ARM_RESET_FLAG (s, ARM_FLAG_THUMB)) 169 #define ARM_SET_INTERWORK(s,t) ((t) ? ARM_SET_FLAG (s, ARM_FLAG_INTERWORK) : ARM_RESET_FLAG (s, ARM_FLAG_INTERWORK)) 170 #define THUMB_SET_FUNC(s,t) ((t) ? ARM_SET_FLAG (s, THUMB_FLAG_FUNC) : ARM_RESET_FLAG (s, THUMB_FLAG_FUNC)) 171 172 void arm_copy_symbol_attributes (symbolS *, symbolS *); 173 174 #ifndef TC_COPY_SYMBOL_ATTRIBUTES 175 #define TC_COPY_SYMBOL_ATTRIBUTES(DEST, SRC) \ 176 (arm_copy_symbol_attributes (DEST, SRC)) 177 #endif 178 179 #define TC_START_LABEL(C,S,STR) (C == ':' || (C == '/' && arm_data_in_code ())) 180 #define tc_canonicalize_symbol_name(str) arm_canonicalize_symbol_name (str); 181 #define obj_adjust_symtab() arm_adjust_symtab () 182 183 #define LISTING_HEADER "ARM GAS " 184 185 #define OPTIONAL_REGISTER_PREFIX '%' 186 187 #define LOCAL_LABEL(name) (name[0] == '.' && name[1] == 'L') 188 #define LOCAL_LABELS_FB 1 189 190 /* This expression evaluates to true if the relocation is for a local 191 object for which we still want to do the relocation at runtime. 192 False if we are willing to perform this relocation while building 193 the .o file. GOTOFF does not need to be checked here because it is 194 not pcrel. I am not sure if some of the others are ever used with 195 pcrel, but it is easier to be safe than sorry. */ 196 197 #define TC_FORCE_RELOCATION_LOCAL(FIX) \ 198 (!(FIX)->fx_pcrel \ 199 || (FIX)->fx_r_type == BFD_RELOC_ARM_GOT32 \ 200 || (FIX)->fx_r_type == BFD_RELOC_32 \ 201 || ((FIX)->fx_addsy != NULL && S_IS_WEAK ((FIX)->fx_addsy)) \ 202 || TC_FORCE_RELOCATION (FIX)) 203 204 /* Force output of R_ARM_REL32 relocations against thumb function symbols. 205 This is needed to ensure the low bit is handled correctly. */ 206 #define TC_FORCE_RELOCATION_SUB_SAME(FIX, SEG) \ 207 (THUMB_IS_FUNC ((FIX)->fx_addsy) \ 208 || !SEG_NORMAL (SEG)) 209 210 #define TC_FORCE_RELOCATION_ABS(FIX) \ 211 (((FIX)->fx_pcrel \ 212 && (FIX)->fx_r_type != BFD_RELOC_32 \ 213 && (FIX)->fx_r_type != BFD_RELOC_ARM_GOT32) \ 214 || TC_FORCE_RELOCATION(FIX)) 215 216 #define TC_CONS_FIX_NEW cons_fix_new_arm 217 218 #define MAX_MEM_ALIGNMENT_BYTES 6 219 #define MAX_MEM_FOR_RS_ALIGN_CODE ((1 << MAX_MEM_ALIGNMENT_BYTES) - 1) 220 221 /* For frags in code sections we need to record whether they contain 222 ARM code or THUMB code. This is that if they have to be aligned, 223 they can contain the correct type of no-op instruction. */ 224 struct arm_frag_type 225 { 226 int thumb_mode; 227 #ifdef OBJ_ELF 228 /* If there is a mapping symbol at offset 0 in this frag, 229 it will be saved in FIRST_MAP. If there are any mapping 230 symbols in this frag, the last one will be saved in 231 LAST_MAP. */ 232 symbolS *first_map, *last_map; 233 #endif 234 }; 235 236 #define TC_FRAG_TYPE struct arm_frag_type 237 /* NOTE: max_chars is a local variable from frag_var / frag_variant. */ 238 #define TC_FRAG_INIT(fragp) arm_init_frag (fragp, max_chars) 239 #define HANDLE_ALIGN(fragp) arm_handle_align (fragp) 240 241 #define md_do_align(N, FILL, LEN, MAX, LABEL) \ 242 if (FILL == NULL && (N) != 0 && ! need_pass_2 && subseg_text_p (now_seg)) \ 243 { \ 244 arm_frag_align_code (N, MAX); \ 245 goto LABEL; \ 246 } 247 248 #define DWARF2_LINE_MIN_INSN_LENGTH 2 249 250 /* The lr register is r14. */ 251 #define DWARF2_DEFAULT_RETURN_COLUMN 14 252 253 /* Registers are generally saved at negative offsets to the CFA. */ 254 #define DWARF2_CIE_DATA_ALIGNMENT (-4) 255 256 /* State variables for IT block handling. */ 257 enum it_state 258 { 259 OUTSIDE_IT_BLOCK, MANUAL_IT_BLOCK, AUTOMATIC_IT_BLOCK 260 }; 261 struct current_it 262 { 263 int mask; 264 enum it_state state; 265 int cc; 266 int block_length; 267 char *insn; 268 int state_handled; 269 int warn_deprecated; 270 int insn_cond; 271 }; 272 273 #ifdef OBJ_ELF 274 # define obj_frob_symbol(sym, punt) armelf_frob_symbol ((sym), & (punt)) 275 # define md_elf_section_change_hook() arm_elf_change_section () 276 # define md_elf_section_type(str, len) arm_elf_section_type (str, len) 277 # define GLOBAL_OFFSET_TABLE_NAME "_GLOBAL_OFFSET_TABLE_" 278 # define TC_SEGMENT_INFO_TYPE struct arm_segment_info_type 279 280 /* This is not really an alignment operation, but it's something we 281 need to do at the same time: whenever we are figuring out the 282 alignment for data, we should check whether a $d symbol is 283 necessary. */ 284 # define md_cons_align(nbytes) mapping_state (MAP_DATA) 285 286 enum mstate 287 { 288 MAP_UNDEFINED = 0, /* Must be zero, for seginfo in new sections. */ 289 MAP_DATA, 290 MAP_ARM, 291 MAP_THUMB 292 }; 293 294 void mapping_state (enum mstate); 295 296 struct arm_segment_info_type 297 { 298 enum mstate mapstate; 299 300 /* Bit N indicates that an R_ARM_NONE relocation has been output for 301 __aeabi_unwind_cpp_prN already if set. This enables dependencies to be 302 emitted only once per section, to save unnecessary bloat. */ 303 unsigned int marked_pr_dependency; 304 305 struct current_it current_it; 306 }; 307 308 /* We want .cfi_* pseudo-ops for generating unwind info. */ 309 #define TARGET_USE_CFIPOP 1 310 311 /* CFI hooks. */ 312 #define tc_regname_to_dw2regnum tc_arm_regname_to_dw2regnum 313 #define tc_cfi_frame_initial_instructions tc_arm_frame_initial_instructions 314 315 #else /* Not OBJ_ELF. */ 316 #define GLOBAL_OFFSET_TABLE_NAME "__GLOBAL_OFFSET_TABLE_" 317 #endif 318 319 #if defined OBJ_ELF || defined OBJ_COFF 320 321 # define EXTERN_FORCE_RELOC 1 322 # define tc_fix_adjustable(FIX) arm_fix_adjustable (FIX) 323 #endif 324 325 #ifdef OBJ_ELF 326 /* Values passed to md_apply_fix don't include the symbol value. */ 327 # define MD_APPLY_SYM_VALUE(FIX) arm_apply_sym_value (FIX) 328 #endif 329 330 #ifdef OBJ_COFF 331 # define TC_VALIDATE_FIX(FIX, SEGTYPE, LABEL) arm_validate_fix (FIX) 332 /* Values passed to md_apply_fix don't include the symbol value. */ 333 # define MD_APPLY_SYM_VALUE(FIX) 0 334 #endif 335 336 #define MD_PCREL_FROM_SECTION(F,S) md_pcrel_from_section(F,S) 337 338 extern long md_pcrel_from_section (struct fix *, segT); 339 extern void arm_frag_align_code (int, int); 340 extern void arm_validate_fix (struct fix *); 341 extern const char * elf32_arm_target_format (void); 342 extern void arm_elf_change_section (void); 343 extern int arm_force_relocation (struct fix *); 344 extern void arm_cleanup (void); 345 extern void arm_start_line_hook (void); 346 extern void arm_frob_label (symbolS *); 347 extern int arm_data_in_code (void); 348 extern char * arm_canonicalize_symbol_name (char *); 349 extern void arm_adjust_symtab (void); 350 extern void armelf_frob_symbol (symbolS *, int *); 351 extern void cons_fix_new_arm (fragS *, int, int, expressionS *, 352 bfd_reloc_code_real_type); 353 extern void arm_init_frag (struct frag *, int); 354 extern void arm_handle_align (struct frag *); 355 extern bfd_boolean arm_fix_adjustable (struct fix *); 356 extern int arm_elf_section_type (const char *, size_t); 357 extern int tc_arm_regname_to_dw2regnum (char *regname); 358 extern void tc_arm_frame_initial_instructions (void); 359 360 #ifdef TE_PE 361 362 #define O_secrel O_md1 363 364 #define TC_DWARF2_EMIT_OFFSET tc_pe_dwarf2_emit_offset 365 void tc_pe_dwarf2_emit_offset (symbolS *, unsigned int); 366 367 #endif /* TE_PE */ 368 369 #ifdef OBJ_ELF 370 #define CONVERT_SYMBOLIC_ATTRIBUTE(name) arm_convert_symbolic_attribute (name) 371 extern int arm_convert_symbolic_attribute (const char *); 372 extern int arm_apply_sym_value (struct fix *); 373 #endif 374 375 #define tc_comment_chars arm_comment_chars 376 extern char arm_comment_chars[]; 377 378 #define tc_line_separator_chars arm_line_separator_chars 379 extern char arm_line_separator_chars[]; 380
