1/* This file is tc-arm.h 2 Copyright 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 3 2004, 2005, 2006, 2007 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 2, 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 48struct 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#define TC_FORCE_RELOCATION(FIX) arm_force_relocation (FIX) 83 84#define md_relax_frag(segment, fragp, stretch) \ 85 arm_relax_frag(segment, fragp, stretch) 86extern int arm_relax_frag (asection *, struct frag *, long); 87 88#define md_optimize_expr(l,o,r) arm_optimize_expr (l, o, r) 89extern int arm_optimize_expr (expressionS *, operatorT, expressionS *); 90 91#define md_cleanup() arm_cleanup () 92 93#define md_start_line_hook() arm_start_line_hook () 94 95#define tc_frob_label(S) arm_frob_label (S) 96 97/* We also need to mark assembler created symbols: */ 98#define tc_frob_fake_label(S) arm_frob_label (S) 99 100#ifdef OBJ_ELF 101#define md_end arm_md_end 102extern void arm_md_end (void); 103bfd_boolean arm_is_eabi (void); 104#endif 105 106/* NOTE: The fake label creation in stabs.c:s_stab_generic() has 107 deliberately not been updated to mark assembler created stabs 108 symbols as Thumb. */ 109 110#define TC_FIX_TYPE int 111#define TC_INIT_FIX_DATA(FIX) ((FIX)->tc_fix_data = 0) 112 113/* We need to keep some local information on symbols. */ 114 115#define TC_SYMFIELD_TYPE unsigned int 116#define ARM_GET_FLAG(s) (*symbol_get_tc (s)) 117#define ARM_SET_FLAG(s,v) (*symbol_get_tc (s) |= (v)) 118#define ARM_RESET_FLAG(s,v) (*symbol_get_tc (s) &= ~(v)) 119 120#define ARM_FLAG_THUMB (1 << 0) /* The symbol is a Thumb symbol rather than an Arm symbol. */ 121#define ARM_FLAG_INTERWORK (1 << 1) /* The symbol is attached to code that supports interworking. */ 122#define THUMB_FLAG_FUNC (1 << 2) /* The symbol is attached to the start of a Thumb function. */ 123 124#define ARM_IS_THUMB(s) (ARM_GET_FLAG (s) & ARM_FLAG_THUMB) 125#define ARM_IS_INTERWORK(s) (ARM_GET_FLAG (s) & ARM_FLAG_INTERWORK) 126#ifdef OBJ_ELF 127 128/* For ELF objects THUMB_IS_FUNC is inferred from 129 ARM_IS_TUMB and the function type. */ 130#define THUMB_IS_FUNC(s) \ 131 ((arm_is_eabi () \ 132 && (ARM_IS_THUMB (s)) \ 133 && (symbol_get_bfdsym (s)->flags & BSF_FUNCTION)) \ 134 || (ARM_GET_FLAG (s) & THUMB_FLAG_FUNC)) 135 136#else 137#define THUMB_IS_FUNC(s) (ARM_GET_FLAG (s) & THUMB_FLAG_FUNC) 138#endif 139 140#define ARM_SET_THUMB(s,t) ((t) ? ARM_SET_FLAG (s, ARM_FLAG_THUMB) : ARM_RESET_FLAG (s, ARM_FLAG_THUMB)) 141#define ARM_SET_INTERWORK(s,t) ((t) ? ARM_SET_FLAG (s, ARM_FLAG_INTERWORK) : ARM_RESET_FLAG (s, ARM_FLAG_INTERWORK)) 142#define THUMB_SET_FUNC(s,t) ((t) ? ARM_SET_FLAG (s, THUMB_FLAG_FUNC) : ARM_RESET_FLAG (s, THUMB_FLAG_FUNC)) 143 144void arm_copy_symbol_attributes (symbolS *, symbolS *); 145#ifndef TC_COPY_SYMBOL_ATTRIBUTES 146#define TC_COPY_SYMBOL_ATTRIBUTES(DEST, SRC) \ 147 (arm_copy_symbol_attributes (DEST, SRC)) 148#endif 149 150#define TC_START_LABEL(C,STR) (c == ':' || (c == '/' && arm_data_in_code ())) 151#define tc_canonicalize_symbol_name(str) arm_canonicalize_symbol_name (str); 152#define obj_adjust_symtab() arm_adjust_symtab () 153 154#define LISTING_HEADER "ARM GAS " 155 156#define OPTIONAL_REGISTER_PREFIX '%' 157 158#define LOCAL_LABEL(name) (name[0] == '.' && name[1] == 'L') 159#define LOCAL_LABELS_FB 1 160 161/* This expression evaluates to true if the relocation is for a local 162 object for which we still want to do the relocation at runtime. 163 False if we are willing to perform this relocation while building 164 the .o file. GOTOFF does not need to be checked here because it is 165 not pcrel. I am not sure if some of the others are ever used with 166 pcrel, but it is easier to be safe than sorry. */ 167 168#define TC_FORCE_RELOCATION_LOCAL(FIX) \ 169 (!(FIX)->fx_pcrel \ 170 || (FIX)->fx_r_type == BFD_RELOC_ARM_GOT32 \ 171 || (FIX)->fx_r_type == BFD_RELOC_32 \ 172 || TC_FORCE_RELOCATION (FIX)) 173 174/* Force output of R_ARM_REL32 relocations against thumb function symbols. 175 This is needed to ensure the low bit is handled correctly. */ 176#define TC_FORCE_RELOCATION_SUB_SAME(FIX, SEG) \ 177 (THUMB_IS_FUNC ((FIX)->fx_addsy) \ 178 || !SEG_NORMAL (SEG)) 179 180#define TC_CONS_FIX_NEW cons_fix_new_arm 181 182#define MAX_MEM_FOR_RS_ALIGN_CODE 31 183 184/* For frags in code sections we need to record whether they contain 185 ARM code or THUMB code. This is that if they have to be aligned, 186 they can contain the correct type of no-op instruction. */ 187#define TC_FRAG_TYPE int 188#define TC_FRAG_INIT(fragp) arm_init_frag (fragp) 189#define HANDLE_ALIGN(fragp) arm_handle_align (fragp) 190 191#define md_do_align(N, FILL, LEN, MAX, LABEL) \ 192 if (FILL == NULL && (N) != 0 && ! need_pass_2 && subseg_text_p (now_seg)) \ 193 { \ 194 arm_frag_align_code (N, MAX); \ 195 goto LABEL; \ 196 } 197 198#define DWARF2_LINE_MIN_INSN_LENGTH 2 199 200/* The lr register is r14. */ 201#define DWARF2_DEFAULT_RETURN_COLUMN 14 202 203/* Registers are generally saved at negative offsets to the CFA. */ 204#define DWARF2_CIE_DATA_ALIGNMENT (-4) 205 206#ifdef OBJ_ELF 207# define obj_frob_symbol(sym, punt) armelf_frob_symbol ((sym), & (punt)) 208# define md_elf_section_change_hook() arm_elf_change_section () 209# define md_elf_section_type(str, len) arm_elf_section_type (str, len) 210# define GLOBAL_OFFSET_TABLE_NAME "_GLOBAL_OFFSET_TABLE_" 211# define TC_SEGMENT_INFO_TYPE struct arm_segment_info_type 212 213/* This is not really an alignment operation, but it's something we 214 need to do at the same time: whenever we are figuring out the 215 alignment for data, we should check whether a $d symbol is 216 necessary. */ 217# define md_cons_align(nbytes) mapping_state (MAP_DATA) 218 219enum mstate 220{ 221 MAP_UNDEFINED = 0, /* Must be zero, for seginfo in new sections. */ 222 MAP_DATA, 223 MAP_ARM, 224 MAP_THUMB 225}; 226 227void mapping_state (enum mstate); 228 229struct arm_segment_info_type 230{ 231 enum mstate mapstate; 232 unsigned int marked_pr_dependency; 233}; 234 235/* We want .cfi_* pseudo-ops for generating unwind info. */ 236#define TARGET_USE_CFIPOP 1 237 238/* CFI hooks. */ 239#define tc_regname_to_dw2regnum tc_arm_regname_to_dw2regnum 240#define tc_cfi_frame_initial_instructions tc_arm_frame_initial_instructions 241 242#else /* Not OBJ_ELF. */ 243#define GLOBAL_OFFSET_TABLE_NAME "__GLOBAL_OFFSET_TABLE_" 244#endif 245 246#if defined OBJ_ELF || defined OBJ_COFF 247 248# define EXTERN_FORCE_RELOC 1 249# define tc_fix_adjustable(FIX) arm_fix_adjustable (FIX) 250/* Values passed to md_apply_fix don't include the symbol value. */ 251# define MD_APPLY_SYM_VALUE(FIX) 0 252# define TC_VALIDATE_FIX(FIX, SEGTYPE, LABEL) arm_validate_fix (FIX) 253 254#endif 255 256#define MD_PCREL_FROM_SECTION(F,S) md_pcrel_from_section(F,S) 257 258extern long md_pcrel_from_section (struct fix *, segT); 259extern void arm_frag_align_code (int, int); 260extern void arm_validate_fix (struct fix *); 261extern const char * elf32_arm_target_format (void); 262extern void arm_elf_change_section (void); 263extern int arm_force_relocation (struct fix *); 264extern void arm_cleanup (void); 265extern void arm_start_line_hook (void); 266extern void arm_frob_label (symbolS *); 267extern int arm_data_in_code (void); 268extern char * arm_canonicalize_symbol_name (char *); 269extern void arm_adjust_symtab (void); 270extern void armelf_frob_symbol (symbolS *, int *); 271extern void cons_fix_new_arm (fragS *, int, int, expressionS *); 272extern void arm_init_frag (struct frag *); 273extern void arm_handle_align (struct frag *); 274extern bfd_boolean arm_fix_adjustable (struct fix *); 275extern int arm_elf_section_type (const char *, size_t); 276extern int tc_arm_regname_to_dw2regnum (char *regname); 277extern void tc_arm_frame_initial_instructions (void); 278 279#ifdef TE_PE 280 281#define O_secrel O_md1 282 283#define TC_DWARF2_EMIT_OFFSET tc_pe_dwarf2_emit_offset 284void tc_pe_dwarf2_emit_offset (symbolS *, unsigned int); 285 286#endif /* TE_PE */ 287