1 /* This file is tc-arm.h 2 Copyright (C) 1994-2016 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(NUL_CHAR, NEXT_CHAR) \ 108 tc_start_label_without_colon () 109 extern bfd_boolean tc_start_label_without_colon (void); 110 111 #define tc_frob_label(S) arm_frob_label (S) 112 113 /* We also need to mark assembler created symbols: */ 114 #define tc_frob_fake_label(S) arm_frob_label (S) 115 116 #ifdef OBJ_ELF 117 #define md_end arm_md_end 118 extern void arm_md_end (void); 119 bfd_boolean arm_is_eabi (void); 120 121 #define md_post_relax_hook aeabi_set_public_attributes () 122 extern void aeabi_set_public_attributes (void); 123 #endif 124 125 /* NOTE: The fake label creation in stabs.c:s_stab_generic() has 126 deliberately not been updated to mark assembler created stabs 127 symbols as Thumb. */ 128 129 #define TC_FIX_TYPE int 130 #define TC_INIT_FIX_DATA(FIX) ((FIX)->tc_fix_data = 0) 131 132 /* We need to keep some local information on symbols. */ 133 134 #define TC_SYMFIELD_TYPE unsigned int 135 #define ARM_GET_FLAG(s) (*symbol_get_tc (s)) 136 #define ARM_SET_FLAG(s,v) (*symbol_get_tc (s) |= (v)) 137 #define ARM_RESET_FLAG(s,v) (*symbol_get_tc (s) &= ~(v)) 138 139 #define ARM_FLAG_THUMB (1 << 0) /* The symbol is a Thumb symbol rather than an Arm symbol. */ 140 #define ARM_FLAG_INTERWORK (1 << 1) /* The symbol is attached to code that supports interworking. */ 141 #define THUMB_FLAG_FUNC (1 << 2) /* The symbol is attached to the start of a Thumb function. */ 142 143 #define ARM_IS_THUMB(s) (ARM_GET_FLAG (s) & ARM_FLAG_THUMB) 144 #define ARM_IS_INTERWORK(s) (ARM_GET_FLAG (s) & ARM_FLAG_INTERWORK) 145 146 #ifdef OBJ_ELF 147 148 /* For ELF objects THUMB_IS_FUNC is inferred from 149 ARM_IS_THUMB and the function type. */ 150 #define THUMB_IS_FUNC(s) \ 151 ((s) != NULL \ 152 && ((arm_is_eabi () \ 153 && (ARM_IS_THUMB (s)) \ 154 && (symbol_get_bfdsym (s)->flags & BSF_FUNCTION)) \ 155 || (ARM_GET_FLAG (s) & THUMB_FLAG_FUNC))) 156 157 #define ARM_IS_FUNC(s) \ 158 (((s) != NULL \ 159 && arm_is_eabi () \ 160 && !(ARM_IS_THUMB (s)) \ 161 /* && !(THUMB_FLAG_FUNC & ARM_GET_FLAG (s)) \ */ \ 162 && (symbol_get_bfdsym (s)->flags & BSF_FUNCTION))) 163 164 165 #else 166 167 #define THUMB_IS_FUNC(s) ((s) && ARM_GET_FLAG (s) & THUMB_FLAG_FUNC) 168 #define ARM_IS_FUNC(s) (!THUMB_IS_FUNC (s) \ 169 && (s) && (symbol_get_bfdsym (s)->flags & BSF_FUNCTION)) 170 #endif 171 172 #define ARM_SET_THUMB(s,t) ((t) ? ARM_SET_FLAG (s, ARM_FLAG_THUMB) : ARM_RESET_FLAG (s, ARM_FLAG_THUMB)) 173 #define ARM_SET_INTERWORK(s,t) ((t) ? ARM_SET_FLAG (s, ARM_FLAG_INTERWORK) : ARM_RESET_FLAG (s, ARM_FLAG_INTERWORK)) 174 #define THUMB_SET_FUNC(s,t) ((t) ? ARM_SET_FLAG (s, THUMB_FLAG_FUNC) : ARM_RESET_FLAG (s, THUMB_FLAG_FUNC)) 175 176 void arm_copy_symbol_attributes (symbolS *, symbolS *); 177 178 #ifndef TC_COPY_SYMBOL_ATTRIBUTES 179 #define TC_COPY_SYMBOL_ATTRIBUTES(DEST, SRC) \ 180 (arm_copy_symbol_attributes (DEST, SRC)) 181 #endif 182 183 #define TC_START_LABEL(STR, NUL_CHAR, NEXT_CHAR) \ 184 (NEXT_CHAR == ':' || (NEXT_CHAR == '/' && arm_data_in_code ())) 185 #define tc_canonicalize_symbol_name(str) arm_canonicalize_symbol_name (str); 186 #define obj_adjust_symtab() arm_adjust_symtab () 187 188 #define LISTING_HEADER "ARM GAS " 189 190 #define OPTIONAL_REGISTER_PREFIX '%' 191 192 #define LOCAL_LABEL(name) (name[0] == '.' && name[1] == 'L') 193 #define LOCAL_LABELS_FB 1 194 195 /* This expression evaluates to true if the relocation is for a local 196 object for which we still want to do the relocation at runtime. 197 False if we are willing to perform this relocation while building 198 the .o file. GOTOFF does not need to be checked here because it is 199 not pcrel. I am not sure if some of the others are ever used with 200 pcrel, but it is easier to be safe than sorry. */ 201 202 #define TC_FORCE_RELOCATION_LOCAL(FIX) \ 203 (!(FIX)->fx_pcrel \ 204 || (FIX)->fx_r_type == BFD_RELOC_ARM_GOT32 \ 205 || (FIX)->fx_r_type == BFD_RELOC_32 \ 206 || ((FIX)->fx_addsy != NULL && S_IS_WEAK ((FIX)->fx_addsy)) \ 207 || TC_FORCE_RELOCATION (FIX)) 208 209 /* Force output of R_ARM_REL32 relocations against thumb function symbols. 210 This is needed to ensure the low bit is handled correctly. */ 211 #define TC_FORCE_RELOCATION_SUB_SAME(FIX, SEG) \ 212 (THUMB_IS_FUNC ((FIX)->fx_addsy) \ 213 || !SEG_NORMAL (SEG)) 214 215 #define TC_FORCE_RELOCATION_ABS(FIX) \ 216 (((FIX)->fx_pcrel \ 217 && (FIX)->fx_r_type != BFD_RELOC_32 \ 218 && (FIX)->fx_r_type != BFD_RELOC_ARM_GOT32) \ 219 || TC_FORCE_RELOCATION(FIX)) 220 221 #define TC_CONS_FIX_NEW cons_fix_new_arm 222 223 #define MAX_MEM_ALIGNMENT_BYTES 6 224 #define MAX_MEM_FOR_RS_ALIGN_CODE ((1 << MAX_MEM_ALIGNMENT_BYTES) - 1) 225 226 /* For frags in code sections we need to record whether they contain 227 ARM code or THUMB code. This is that if they have to be aligned, 228 they can contain the correct type of no-op instruction. */ 229 struct arm_frag_type 230 { 231 int thumb_mode; 232 #ifdef OBJ_ELF 233 /* If there is a mapping symbol at offset 0 in this frag, 234 it will be saved in FIRST_MAP. If there are any mapping 235 symbols in this frag, the last one will be saved in 236 LAST_MAP. */ 237 symbolS *first_map, *last_map; 238 #endif 239 }; 240 241 static inline int 242 arm_min (int am_p1, int am_p2) 243 { 244 return am_p1 < am_p2 ? am_p1 : am_p2; 245 } 246 247 #define TC_FRAG_TYPE struct arm_frag_type 248 /* NOTE: max_chars is a local variable from frag_var / frag_variant. */ 249 #define TC_FRAG_INIT(fragp) arm_init_frag (fragp, max_chars) 250 #define TC_ALIGN_ZERO_IS_DEFAULT 1 251 #define HANDLE_ALIGN(fragp) arm_handle_align (fragp) 252 /* PR gas/19276: COFF/PE segment alignment is already handled in coff_frob_section(). */ 253 #ifndef TE_PE 254 #define SUB_SEGMENT_ALIGN(SEG, FRCHAIN) \ 255 ((!(FRCHAIN)->frch_next && subseg_text_p (SEG)) \ 256 ? arm_min (2, get_recorded_alignment (SEG)) : 0) 257 #endif 258 259 #define md_do_align(N, FILL, LEN, MAX, LABEL) \ 260 if (FILL == NULL && (N) != 0 && ! need_pass_2 && subseg_text_p (now_seg)) \ 261 { \ 262 arm_frag_align_code (N, MAX); \ 263 goto LABEL; \ 264 } 265 266 #define DWARF2_LINE_MIN_INSN_LENGTH 2 267 268 /* The lr register is r14. */ 269 #define DWARF2_DEFAULT_RETURN_COLUMN 14 270 271 /* Registers are generally saved at negative offsets to the CFA. */ 272 #define DWARF2_CIE_DATA_ALIGNMENT (-4) 273 274 /* State variables for IT block handling. */ 275 enum it_state 276 { 277 OUTSIDE_IT_BLOCK, MANUAL_IT_BLOCK, AUTOMATIC_IT_BLOCK 278 }; 279 struct current_it 280 { 281 int mask; 282 enum it_state state; 283 int cc; 284 int block_length; 285 char *insn; 286 int state_handled; 287 int warn_deprecated; 288 int insn_cond; 289 }; 290 291 #ifdef OBJ_ELF 292 # define obj_frob_symbol(sym, punt) armelf_frob_symbol ((sym), & (punt)) 293 # define md_elf_section_change_hook() arm_elf_change_section () 294 # define md_elf_section_type(str, len) arm_elf_section_type (str, len) 295 # define GLOBAL_OFFSET_TABLE_NAME "_GLOBAL_OFFSET_TABLE_" 296 # define TC_SEGMENT_INFO_TYPE struct arm_segment_info_type 297 298 /* This is not really an alignment operation, but it's something we 299 need to do at the same time: whenever we are figuring out the 300 alignment for data, we should check whether a $d symbol is 301 necessary. */ 302 # define md_cons_align(nbytes) mapping_state (MAP_DATA) 303 304 enum mstate 305 { 306 MAP_UNDEFINED = 0, /* Must be zero, for seginfo in new sections. */ 307 MAP_DATA, 308 MAP_ARM, 309 MAP_THUMB 310 }; 311 312 void mapping_state (enum mstate); 313 314 struct arm_segment_info_type 315 { 316 enum mstate mapstate; 317 318 /* Bit N indicates that an R_ARM_NONE relocation has been output for 319 __aeabi_unwind_cpp_prN already if set. This enables dependencies to be 320 emitted only once per section, to save unnecessary bloat. */ 321 unsigned int marked_pr_dependency; 322 323 struct current_it current_it; 324 }; 325 326 /* We want .cfi_* pseudo-ops for generating unwind info. */ 327 #define TARGET_USE_CFIPOP 1 328 329 /* CFI hooks. */ 330 #define tc_regname_to_dw2regnum tc_arm_regname_to_dw2regnum 331 #define tc_cfi_frame_initial_instructions tc_arm_frame_initial_instructions 332 333 #else /* Not OBJ_ELF. */ 334 #define GLOBAL_OFFSET_TABLE_NAME "__GLOBAL_OFFSET_TABLE_" 335 #endif 336 337 #if defined OBJ_ELF || defined OBJ_COFF 338 339 # define EXTERN_FORCE_RELOC 1 340 # define tc_fix_adjustable(FIX) arm_fix_adjustable (FIX) 341 #endif 342 343 #ifdef OBJ_ELF 344 /* Values passed to md_apply_fix don't include the symbol value. */ 345 # define MD_APPLY_SYM_VALUE(FIX) arm_apply_sym_value (FIX, this_segment) 346 #endif 347 348 #ifdef OBJ_COFF 349 # define TC_VALIDATE_FIX(FIX, SEGTYPE, LABEL) arm_validate_fix (FIX) 350 /* Values passed to md_apply_fix don't include the symbol value. */ 351 # define MD_APPLY_SYM_VALUE(FIX) 0 352 #endif 353 354 #define MD_PCREL_FROM_SECTION(F,S) md_pcrel_from_section(F,S) 355 356 extern long md_pcrel_from_section (struct fix *, segT); 357 extern void arm_frag_align_code (int, int); 358 extern void arm_validate_fix (struct fix *); 359 extern const char * elf32_arm_target_format (void); 360 extern void arm_elf_change_section (void); 361 extern int arm_force_relocation (struct fix *); 362 extern void arm_cleanup (void); 363 extern void arm_start_line_hook (void); 364 extern void arm_frob_label (symbolS *); 365 extern int arm_data_in_code (void); 366 extern char * arm_canonicalize_symbol_name (char *); 367 extern void arm_adjust_symtab (void); 368 extern void armelf_frob_symbol (symbolS *, int *); 369 extern void cons_fix_new_arm (fragS *, int, int, expressionS *, 370 bfd_reloc_code_real_type); 371 extern void arm_init_frag (struct frag *, int); 372 extern void arm_handle_align (struct frag *); 373 extern bfd_boolean arm_fix_adjustable (struct fix *); 374 extern int arm_elf_section_type (const char *, size_t); 375 extern int tc_arm_regname_to_dw2regnum (char *regname); 376 extern void tc_arm_frame_initial_instructions (void); 377 378 #ifdef TE_PE 379 380 #define O_secrel O_md1 381 382 #define TC_DWARF2_EMIT_OFFSET tc_pe_dwarf2_emit_offset 383 void tc_pe_dwarf2_emit_offset (symbolS *, unsigned int); 384 385 #endif /* TE_PE */ 386 387 #ifdef OBJ_ELF 388 #define CONVERT_SYMBOLIC_ATTRIBUTE(name) arm_convert_symbolic_attribute (name) 389 extern int arm_convert_symbolic_attribute (const char *); 390 extern int arm_apply_sym_value (struct fix *, segT); 391 #endif 392 393 #define tc_comment_chars arm_comment_chars 394 extern char arm_comment_chars[]; 395 396 #define tc_line_separator_chars arm_line_separator_chars 397 extern char arm_line_separator_chars[]; 398 399 #define TC_EQUAL_IN_INSN(c, s) arm_tc_equal_in_insn ((c), (s)) 400 extern bfd_boolean arm_tc_equal_in_insn (int, char *); 401
