1 /* This file is tc-arm.h 2 Copyright 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 3 2004, 2005, 2006, 2007, 2008, 2009, 2012 Free Software Foundation, Inc. 4 Contributed by Richard Earnshaw (rwe@pegasus.esprit.ec.org) 5 Modified by David Taylor (dtaylor@armltd.co.uk) 6 7 This file is part of GAS, the GNU Assembler. 8 9 GAS is free software; you can redistribute it and/or modify 10 it under the terms of the GNU General Public License as published by 11 the Free Software Foundation; either version 3, or (at your option) 12 any later version. 13 14 GAS is distributed in the hope that it will be useful, 15 but WITHOUT ANY WARRANTY; without even the implied warranty of 16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 GNU General Public License for more details. 18 19 You should have received a copy of the GNU General Public License 20 along with GAS; see the file COPYING. If not, write to the Free 21 Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA 22 02110-1301, USA. */ 23 24 #define TC_ARM 1 25 26 #ifndef TARGET_BYTES_BIG_ENDIAN 27 #define TARGET_BYTES_BIG_ENDIAN 0 28 #endif 29 30 #define WORKING_DOT_WORD 31 32 #define COFF_MAGIC ARMMAGIC 33 #define TARGET_ARCH bfd_arch_arm 34 35 #define DIFF_EXPR_OK 36 37 #ifdef LITTLE_ENDIAN 38 #undef LITTLE_ENDIAN 39 #endif 40 41 #ifdef BIG_ENDIAN 42 #undef BIG_ENDIAN 43 #endif 44 45 #define LITTLE_ENDIAN 1234 46 #define BIG_ENDIAN 4321 47 48 struct fix; 49 50 #if defined OBJ_AOUT 51 # if defined TE_RISCIX 52 # define TARGET_FORMAT "a.out-riscix" 53 # elif defined TE_LINUX 54 # define ARM_BI_ENDIAN 55 # define TARGET_FORMAT "a.out-arm-linux" 56 # elif defined TE_NetBSD 57 # define TARGET_FORMAT "a.out-arm-netbsd" 58 # else 59 # define ARM_BI_ENDIAN 60 # define TARGET_FORMAT (target_big_endian ? "a.out-arm-big" : "a.out-arm-little") 61 # endif 62 #elif defined OBJ_AIF 63 # define TARGET_FORMAT "aif" 64 #elif defined OBJ_COFF 65 # define ARM_BI_ENDIAN 66 # if defined TE_PE 67 # if defined TE_EPOC 68 # define TARGET_FORMAT (target_big_endian ? "epoc-pe-arm-big" : "epoc-pe-arm-little") 69 # elif defined TE_WINCE 70 # define TARGET_FORMAT (target_big_endian ? "pe-arm-wince-big" : "pe-arm-wince-little") 71 # else 72 # define TARGET_FORMAT (target_big_endian ? "pe-arm-big" : "pe-arm-little") 73 # endif 74 # else 75 # define TARGET_FORMAT (target_big_endian ? "coff-arm-big" : "coff-arm-little") 76 # endif 77 #elif defined OBJ_ELF 78 # define ARM_BI_ENDIAN 79 # define TARGET_FORMAT elf32_arm_target_format () 80 #endif 81 82 /* We support double slash line-comments for compatibility with the ARM AArch64 Assembler. */ 83 #define DOUBLESLASH_LINE_COMMENTS 84 85 #define tc_symbol_chars arm_symbol_chars 86 extern const char arm_symbol_chars[]; 87 88 #define TC_FORCE_RELOCATION(FIX) arm_force_relocation (FIX) 89 90 extern unsigned int arm_frag_max_var (struct frag *); 91 #define md_frag_max_var arm_frag_max_var 92 93 #define md_relax_frag(segment, fragp, stretch) \ 94 arm_relax_frag (segment, fragp, stretch) 95 extern int arm_relax_frag (asection *, struct frag *, long); 96 97 #define md_optimize_expr(l,o,r) arm_optimize_expr (l, o, r) 98 extern int arm_optimize_expr (expressionS *, operatorT, expressionS *); 99 100 #define md_cleanup() arm_cleanup () 101 102 #define md_start_line_hook() arm_start_line_hook () 103 104 #define tc_frob_label(S) arm_frob_label (S) 105 106 /* We also need to mark assembler created symbols: */ 107 #define tc_frob_fake_label(S) arm_frob_label (S) 108 109 #ifdef OBJ_ELF 110 #define md_end arm_md_end 111 extern void arm_md_end (void); 112 bfd_boolean arm_is_eabi (void); 113 #endif 114 115 /* NOTE: The fake label creation in stabs.c:s_stab_generic() has 116 deliberately not been updated to mark assembler created stabs 117 symbols as Thumb. */ 118 119 #define TC_FIX_TYPE int 120 #define TC_INIT_FIX_DATA(FIX) ((FIX)->tc_fix_data = 0) 121 122 /* We need to keep some local information on symbols. */ 123 124 #define TC_SYMFIELD_TYPE unsigned int 125 #define ARM_GET_FLAG(s) (*symbol_get_tc (s)) 126 #define ARM_SET_FLAG(s,v) (*symbol_get_tc (s) |= (v)) 127 #define ARM_RESET_FLAG(s,v) (*symbol_get_tc (s) &= ~(v)) 128 129 #define ARM_FLAG_THUMB (1 << 0) /* The symbol is a Thumb symbol rather than an Arm symbol. */ 130 #define ARM_FLAG_INTERWORK (1 << 1) /* The symbol is attached to code that supports interworking. */ 131 #define THUMB_FLAG_FUNC (1 << 2) /* The symbol is attached to the start of a Thumb function. */ 132 133 #define ARM_IS_THUMB(s) (ARM_GET_FLAG (s) & ARM_FLAG_THUMB) 134 #define ARM_IS_INTERWORK(s) (ARM_GET_FLAG (s) & ARM_FLAG_INTERWORK) 135 136 #ifdef OBJ_ELF 137 138 /* For ELF objects THUMB_IS_FUNC is inferred from 139 ARM_IS_THUMB and the function type. */ 140 #define THUMB_IS_FUNC(s) \ 141 ((s) != NULL \ 142 && ((arm_is_eabi () \ 143 && (ARM_IS_THUMB (s)) \ 144 && (symbol_get_bfdsym (s)->flags & BSF_FUNCTION)) \ 145 || (ARM_GET_FLAG (s) & THUMB_FLAG_FUNC))) 146 147 #define ARM_IS_FUNC(s) \ 148 (((s) != NULL \ 149 && arm_is_eabi () \ 150 && !(ARM_IS_THUMB (s)) \ 151 /* && !(THUMB_FLAG_FUNC & ARM_GET_FLAG (s)) \ */ \ 152 && (symbol_get_bfdsym (s)->flags & BSF_FUNCTION))) 153 154 155 #else 156 157 #define THUMB_IS_FUNC(s) ((s) && ARM_GET_FLAG (s) & THUMB_FLAG_FUNC) 158 #define ARM_IS_FUNC(s) (!THUMB_IS_FUNC (s) \ 159 && (s) && (symbol_get_bfdsym (s)->flags & BSF_FUNCTION)) 160 #endif 161 162 #define ARM_SET_THUMB(s,t) ((t) ? ARM_SET_FLAG (s, ARM_FLAG_THUMB) : ARM_RESET_FLAG (s, ARM_FLAG_THUMB)) 163 #define ARM_SET_INTERWORK(s,t) ((t) ? ARM_SET_FLAG (s, ARM_FLAG_INTERWORK) : ARM_RESET_FLAG (s, ARM_FLAG_INTERWORK)) 164 #define THUMB_SET_FUNC(s,t) ((t) ? ARM_SET_FLAG (s, THUMB_FLAG_FUNC) : ARM_RESET_FLAG (s, THUMB_FLAG_FUNC)) 165 166 void arm_copy_symbol_attributes (symbolS *, symbolS *); 167 168 #ifndef TC_COPY_SYMBOL_ATTRIBUTES 169 #define TC_COPY_SYMBOL_ATTRIBUTES(DEST, SRC) \ 170 (arm_copy_symbol_attributes (DEST, SRC)) 171 #endif 172 173 #define TC_START_LABEL(C,S,STR) (C == ':' || (C == '/' && arm_data_in_code ())) 174 #define tc_canonicalize_symbol_name(str) arm_canonicalize_symbol_name (str); 175 #define obj_adjust_symtab() arm_adjust_symtab () 176 177 #define LISTING_HEADER "ARM GAS " 178 179 #define OPTIONAL_REGISTER_PREFIX '%' 180 181 #define LOCAL_LABEL(name) (name[0] == '.' && name[1] == 'L') 182 #define LOCAL_LABELS_FB 1 183 184 /* This expression evaluates to true if the relocation is for a local 185 object for which we still want to do the relocation at runtime. 186 False if we are willing to perform this relocation while building 187 the .o file. GOTOFF does not need to be checked here because it is 188 not pcrel. I am not sure if some of the others are ever used with 189 pcrel, but it is easier to be safe than sorry. */ 190 191 #define TC_FORCE_RELOCATION_LOCAL(FIX) \ 192 (!(FIX)->fx_pcrel \ 193 || (FIX)->fx_r_type == BFD_RELOC_ARM_GOT32 \ 194 || (FIX)->fx_r_type == BFD_RELOC_32 \ 195 || ((FIX)->fx_addsy != NULL && S_IS_WEAK ((FIX)->fx_addsy)) \ 196 || TC_FORCE_RELOCATION (FIX)) 197 198 /* Force output of R_ARM_REL32 relocations against thumb function symbols. 199 This is needed to ensure the low bit is handled correctly. */ 200 #define TC_FORCE_RELOCATION_SUB_SAME(FIX, SEG) \ 201 (THUMB_IS_FUNC ((FIX)->fx_addsy) \ 202 || !SEG_NORMAL (SEG)) 203 204 #define TC_FORCE_RELOCATION_ABS(FIX) \ 205 (((FIX)->fx_pcrel \ 206 && (FIX)->fx_r_type != BFD_RELOC_32 \ 207 && (FIX)->fx_r_type != BFD_RELOC_ARM_GOT32) \ 208 || TC_FORCE_RELOCATION(FIX)) 209 210 #define TC_CONS_FIX_NEW cons_fix_new_arm 211 212 #define MAX_MEM_ALIGNMENT_BYTES 6 213 #define MAX_MEM_FOR_RS_ALIGN_CODE ((1 << MAX_MEM_ALIGNMENT_BYTES) - 1) 214 215 /* For frags in code sections we need to record whether they contain 216 ARM code or THUMB code. This is that if they have to be aligned, 217 they can contain the correct type of no-op instruction. */ 218 struct arm_frag_type 219 { 220 int thumb_mode; 221 #ifdef OBJ_ELF 222 /* If there is a mapping symbol at offset 0 in this frag, 223 it will be saved in FIRST_MAP. If there are any mapping 224 symbols in this frag, the last one will be saved in 225 LAST_MAP. */ 226 symbolS *first_map, *last_map; 227 #endif 228 }; 229 230 #define TC_FRAG_TYPE struct arm_frag_type 231 /* NOTE: max_chars is a local variable from frag_var / frag_variant. */ 232 #define TC_FRAG_INIT(fragp) arm_init_frag (fragp, max_chars) 233 #define HANDLE_ALIGN(fragp) arm_handle_align (fragp) 234 235 #define md_do_align(N, FILL, LEN, MAX, LABEL) \ 236 if (FILL == NULL && (N) != 0 && ! need_pass_2 && subseg_text_p (now_seg)) \ 237 { \ 238 arm_frag_align_code (N, MAX); \ 239 goto LABEL; \ 240 } 241 242 #define DWARF2_LINE_MIN_INSN_LENGTH 2 243 244 /* The lr register is r14. */ 245 #define DWARF2_DEFAULT_RETURN_COLUMN 14 246 247 /* Registers are generally saved at negative offsets to the CFA. */ 248 #define DWARF2_CIE_DATA_ALIGNMENT (-4) 249 250 /* State variables for IT block handling. */ 251 enum it_state 252 { 253 OUTSIDE_IT_BLOCK, MANUAL_IT_BLOCK, AUTOMATIC_IT_BLOCK 254 }; 255 struct current_it 256 { 257 int mask; 258 enum it_state state; 259 int cc; 260 int block_length; 261 char *insn; 262 int state_handled; 263 int warn_deprecated; 264 int insn_cond; 265 }; 266 267 #ifdef OBJ_ELF 268 # define obj_frob_symbol(sym, punt) armelf_frob_symbol ((sym), & (punt)) 269 # define md_elf_section_change_hook() arm_elf_change_section () 270 # define md_elf_section_type(str, len) arm_elf_section_type (str, len) 271 # define GLOBAL_OFFSET_TABLE_NAME "_GLOBAL_OFFSET_TABLE_" 272 # define TC_SEGMENT_INFO_TYPE struct arm_segment_info_type 273 274 /* This is not really an alignment operation, but it's something we 275 need to do at the same time: whenever we are figuring out the 276 alignment for data, we should check whether a $d symbol is 277 necessary. */ 278 # define md_cons_align(nbytes) mapping_state (MAP_DATA) 279 280 enum mstate 281 { 282 MAP_UNDEFINED = 0, /* Must be zero, for seginfo in new sections. */ 283 MAP_DATA, 284 MAP_ARM, 285 MAP_THUMB 286 }; 287 288 void mapping_state (enum mstate); 289 290 struct arm_segment_info_type 291 { 292 enum mstate mapstate; 293 294 /* Bit N indicates that an R_ARM_NONE relocation has been output for 295 __aeabi_unwind_cpp_prN already if set. This enables dependencies to be 296 emitted only once per section, to save unnecessary bloat. */ 297 unsigned int marked_pr_dependency; 298 299 struct current_it current_it; 300 }; 301 302 /* We want .cfi_* pseudo-ops for generating unwind info. */ 303 #define TARGET_USE_CFIPOP 1 304 305 /* CFI hooks. */ 306 #define tc_regname_to_dw2regnum tc_arm_regname_to_dw2regnum 307 #define tc_cfi_frame_initial_instructions tc_arm_frame_initial_instructions 308 309 #else /* Not OBJ_ELF. */ 310 #define GLOBAL_OFFSET_TABLE_NAME "__GLOBAL_OFFSET_TABLE_" 311 #endif 312 313 #if defined OBJ_ELF || defined OBJ_COFF 314 315 # define EXTERN_FORCE_RELOC 1 316 # define tc_fix_adjustable(FIX) arm_fix_adjustable (FIX) 317 #endif 318 319 #ifdef OBJ_ELF 320 /* Values passed to md_apply_fix don't include the symbol value. */ 321 # define MD_APPLY_SYM_VALUE(FIX) arm_apply_sym_value (FIX) 322 #endif 323 324 #ifdef OBJ_COFF 325 # define TC_VALIDATE_FIX(FIX, SEGTYPE, LABEL) arm_validate_fix (FIX) 326 /* Values passed to md_apply_fix don't include the symbol value. */ 327 # define MD_APPLY_SYM_VALUE(FIX) 0 328 #endif 329 330 #define MD_PCREL_FROM_SECTION(F,S) md_pcrel_from_section(F,S) 331 332 extern long md_pcrel_from_section (struct fix *, segT); 333 extern void arm_frag_align_code (int, int); 334 extern void arm_validate_fix (struct fix *); 335 extern const char * elf32_arm_target_format (void); 336 extern void arm_elf_change_section (void); 337 extern int arm_force_relocation (struct fix *); 338 extern void arm_cleanup (void); 339 extern void arm_start_line_hook (void); 340 extern void arm_frob_label (symbolS *); 341 extern int arm_data_in_code (void); 342 extern char * arm_canonicalize_symbol_name (char *); 343 extern void arm_adjust_symtab (void); 344 extern void armelf_frob_symbol (symbolS *, int *); 345 extern void cons_fix_new_arm (fragS *, int, int, expressionS *); 346 extern void arm_init_frag (struct frag *, int); 347 extern void arm_handle_align (struct frag *); 348 extern bfd_boolean arm_fix_adjustable (struct fix *); 349 extern int arm_elf_section_type (const char *, size_t); 350 extern int tc_arm_regname_to_dw2regnum (char *regname); 351 extern void tc_arm_frame_initial_instructions (void); 352 353 #ifdef TE_PE 354 355 #define O_secrel O_md1 356 357 #define TC_DWARF2_EMIT_OFFSET tc_pe_dwarf2_emit_offset 358 void tc_pe_dwarf2_emit_offset (symbolS *, unsigned int); 359 360 #endif /* TE_PE */ 361 362 #ifdef OBJ_ELF 363 #define CONVERT_SYMBOLIC_ATTRIBUTE(name) arm_convert_symbolic_attribute (name) 364 extern int arm_convert_symbolic_attribute (const char *); 365 extern int arm_apply_sym_value (struct fix *); 366 #endif 367