1 /* This file is tc-arm.h 2 Copyright 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 3 2004 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 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 # else 70 # define TARGET_FORMAT (target_big_endian ? "pe-arm-big" : "pe-arm-little") 71 # endif 72 # else 73 # define TARGET_FORMAT (target_big_endian ? "coff-arm-big" : "coff-arm-little") 74 # endif 75 #elif defined OBJ_ELF 76 # define ARM_BI_ENDIAN 77 # define TARGET_FORMAT elf32_arm_target_format () 78 #endif 79 80 #define TC_FORCE_RELOCATION(FIX) arm_force_relocation (FIX) 81 82 #define md_relax_frag(segment, fragp, stretch) \ 83 arm_relax_frag(segment, fragp, stretch) 84 extern int arm_relax_frag (asection *, struct frag *, long); 85 86 #define md_optimize_expr(l,o,r) arm_optimize_expr (l, o, r) 87 extern int arm_optimize_expr (expressionS *, operatorT, expressionS *); 88 89 #define md_cleanup() arm_cleanup () 90 91 #define md_start_line_hook() arm_start_line_hook () 92 93 #define tc_frob_label(S) arm_frob_label (S) 94 95 /* We also need to mark assembler created symbols: */ 96 #define tc_frob_fake_label(S) arm_frob_label (S) 97 98 #ifdef OBJ_ELF 99 #define md_end arm_md_end 100 extern void arm_md_end (void); 101 #endif 102 103 /* NOTE: The fake label creation in stabs.c:s_stab_generic() has 104 deliberately not been updated to mark assembler created stabs 105 symbols as Thumb. */ 106 107 #define TC_FIX_TYPE int 108 #define TC_INIT_FIX_DATA(FIX) ((FIX)->tc_fix_data = 0) 109 110 /* We need to keep some local information on symbols. */ 111 112 #define TC_SYMFIELD_TYPE unsigned int 113 #define ARM_GET_FLAG(s) (*symbol_get_tc (s)) 114 #define ARM_SET_FLAG(s,v) (*symbol_get_tc (s) |= (v)) 115 #define ARM_RESET_FLAG(s,v) (*symbol_get_tc (s) &= ~(v)) 116 117 #define ARM_FLAG_THUMB (1 << 0) /* The symbol is a Thumb symbol rather than an Arm symbol. */ 118 #define ARM_FLAG_INTERWORK (1 << 1) /* The symbol is attached to code that supports interworking. */ 119 #define THUMB_FLAG_FUNC (1 << 2) /* The symbol is attached to the start of a Thumb function. */ 120 121 #define ARM_IS_THUMB(s) (ARM_GET_FLAG (s) & ARM_FLAG_THUMB) 122 #define ARM_IS_INTERWORK(s) (ARM_GET_FLAG (s) & ARM_FLAG_INTERWORK) 123 #define THUMB_IS_FUNC(s) (ARM_GET_FLAG (s) & THUMB_FLAG_FUNC) 124 125 #define ARM_SET_THUMB(s,t) ((t) ? ARM_SET_FLAG (s, ARM_FLAG_THUMB) : ARM_RESET_FLAG (s, ARM_FLAG_THUMB)) 126 #define ARM_SET_INTERWORK(s,t) ((t) ? ARM_SET_FLAG (s, ARM_FLAG_INTERWORK) : ARM_RESET_FLAG (s, ARM_FLAG_INTERWORK)) 127 #define THUMB_SET_FUNC(s,t) ((t) ? ARM_SET_FLAG (s, THUMB_FLAG_FUNC) : ARM_RESET_FLAG (s, THUMB_FLAG_FUNC)) 128 129 #define TC_START_LABEL(C,STR) (c == ':' || (c == '/' && arm_data_in_code ())) 130 #define tc_canonicalize_symbol_name(str) arm_canonicalize_symbol_name (str); 131 #define obj_adjust_symtab() arm_adjust_symtab () 132 133 #define LISTING_HEADER "ARM GAS " 134 135 #define OPTIONAL_REGISTER_PREFIX '%' 136 137 #define LOCAL_LABEL(name) (name[0] == '.' && name[1] == 'L') 138 #define LOCAL_LABELS_FB 1 139 140 /* This expression evaluates to true if the relocation is for a local 141 object for which we still want to do the relocation at runtime. 142 False if we are willing to perform this relocation while building 143 the .o file. GOTOFF does not need to be checked here because it is 144 not pcrel. I am not sure if some of the others are ever used with 145 pcrel, but it is easier to be safe than sorry. */ 146 147 #define TC_FORCE_RELOCATION_LOCAL(FIX) \ 148 (!(FIX)->fx_pcrel \ 149 || (FIX)->fx_plt \ 150 || (FIX)->fx_r_type == BFD_RELOC_ARM_GOT32 \ 151 || (FIX)->fx_r_type == BFD_RELOC_32 \ 152 || TC_FORCE_RELOCATION (FIX)) 153 154 /* Force output of R_ARM_REL32 relocations against thumb function symbols. 155 This is needed to ensure the low bit is handled correctly. */ 156 #define TC_FORCE_RELOCATION_SUB_SAME(FIX, SEG) \ 157 (THUMB_IS_FUNC ((FIX)->fx_addsy) \ 158 || !SEG_NORMAL (SEG)) 159 160 #define TC_CONS_FIX_NEW cons_fix_new_arm 161 162 #define MAX_MEM_FOR_RS_ALIGN_CODE 31 163 164 /* For frags in code sections we need to record whether they contain 165 ARM code or THUMB code. This is that if they have to be aligned, 166 they can contain the correct type of no-op instruction. */ 167 #define TC_FRAG_TYPE int 168 #define TC_FRAG_INIT(fragp) arm_init_frag (fragp) 169 #define HANDLE_ALIGN(fragp) arm_handle_align (fragp) 170 171 #define md_do_align(N, FILL, LEN, MAX, LABEL) \ 172 if (FILL == NULL && (N) != 0 && ! need_pass_2 && subseg_text_p (now_seg)) \ 173 { \ 174 arm_frag_align_code (N, MAX); \ 175 goto LABEL; \ 176 } 177 178 #ifdef OBJ_ELF 179 # define DWARF2_LINE_MIN_INSN_LENGTH 2 180 # define obj_frob_symbol(sym, punt) armelf_frob_symbol ((sym), & (punt)) 181 # define md_elf_section_change_hook() arm_elf_change_section () 182 # define md_elf_section_type(str, len) arm_elf_section_type (str, len) 183 # define GLOBAL_OFFSET_TABLE_NAME "_GLOBAL_OFFSET_TABLE_" 184 # define TC_SEGMENT_INFO_TYPE struct arm_segment_info_type 185 186 enum mstate 187 { 188 MAP_UNDEFINED = 0, /* Must be zero, for seginfo in new sections. */ 189 MAP_DATA, 190 MAP_ARM, 191 MAP_THUMB 192 }; 193 194 struct arm_segment_info_type 195 { 196 enum mstate mapstate; 197 unsigned int marked_pr_dependency; 198 }; 199 200 /* We want .cfi_* pseudo-ops for generating unwind info. */ 201 #define TARGET_USE_CFIPOP 1 202 203 /* The lr register is r14. */ 204 #define DWARF2_DEFAULT_RETURN_COLUMN 14 205 206 /* Registers are generally saved at negative offsets to the CFA. */ 207 #define DWARF2_CIE_DATA_ALIGNMENT -4 208 209 /* CFI hooks. */ 210 #define tc_regname_to_dw2regnum tc_arm_regname_to_dw2regnum 211 #define tc_cfi_frame_initial_instructions tc_arm_frame_initial_instructions 212 213 #else /* Not OBJ_ELF. */ 214 #define GLOBAL_OFFSET_TABLE_NAME "__GLOBAL_OFFSET_TABLE_" 215 #endif 216 217 #if defined OBJ_ELF || defined OBJ_COFF 218 219 # define EXTERN_FORCE_RELOC 1 220 # define tc_fix_adjustable(FIX) arm_fix_adjustable (FIX) 221 /* Values passed to md_apply_fix don't include the symbol value. */ 222 # define MD_APPLY_SYM_VALUE(FIX) 0 223 # define TC_VALIDATE_FIX(FIX, SEGTYPE, LABEL) arm_validate_fix (FIX) 224 225 #endif 226 227 #define MD_PCREL_FROM_SECTION(F,S) md_pcrel_from_section(F,S) 228 229 extern long md_pcrel_from_section (struct fix *, segT); 230 extern void arm_frag_align_code (int, int); 231 extern void arm_validate_fix (struct fix *); 232 extern const char * elf32_arm_target_format (void); 233 extern void arm_elf_change_section (void); 234 extern int arm_force_relocation (struct fix *); 235 extern void arm_cleanup (void); 236 extern void arm_start_line_hook (void); 237 extern void arm_frob_label (symbolS *); 238 extern int arm_data_in_code (void); 239 extern char * arm_canonicalize_symbol_name (char *); 240 extern void arm_adjust_symtab (void); 241 extern void armelf_frob_symbol (symbolS *, int *); 242 extern void cons_fix_new_arm (fragS *, int, int, expressionS *); 243 extern void arm_init_frag (struct frag *); 244 extern void arm_handle_align (struct frag *); 245 extern bfd_boolean arm_fix_adjustable (struct fix *); 246 extern int arm_elf_section_type (const char *, size_t); 247 extern int tc_arm_regname_to_dw2regnum (const char *regname); 248 extern void tc_arm_frame_initial_instructions (void); 249