1 /* tc-arc.h - Macros and type defines for the ARC. 2 Copyright (C) 2014-2016 Free Software Foundation, Inc. 3 4 Contributed by Claudiu Zissulescu (claziss@synopsys.com) 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 10 published by the Free Software Foundation; either version 3, 11 or (at your option) any later version. 12 13 GAS is distributed in the hope that it will be useful, but 14 WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See 16 the 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 #include "opcode/arc.h" 24 25 /* By convention, you should define this macro in the `.h' file. For 26 example, `tc-m68k.h' defines `TC_M68K'. You might have to use this 27 if it is necessary to add CPU specific code to the object format 28 file. */ 29 #define TC_ARC 30 31 /* We want local label support. */ 32 #define LOCAL_LABELS_FB 1 33 34 /* This macro is the BFD architecture to pass to 35 `bfd_set_arch_mach'. */ 36 #define TARGET_ARCH bfd_arch_arc 37 38 /* The `extsym - .' expressions can be emitted using PC-relative 39 relocs. */ 40 #define DIFF_EXPR_OK 41 42 #define REGISTER_PREFIX '%' 43 44 #undef LITTLE_ENDIAN 45 #define LITTLE_ENDIAN 1234 46 47 #undef BIG_ENDIAN 48 #define BIG_ENDIAN 4321 49 50 #ifdef TARGET_BYTES_BIG_ENDIAN 51 52 # define DEFAULT_TARGET_FORMAT "elf32-bigarc" 53 # define DEFAULT_BYTE_ORDER BIG_ENDIAN 54 55 #else 56 /* You should define this macro to be non-zero if the target is big 57 endian, and zero if the target is little endian. */ 58 # define TARGET_BYTES_BIG_ENDIAN 0 59 60 # define DEFAULT_TARGET_FORMAT "elf32-littlearc" 61 # define DEFAULT_BYTE_ORDER LITTLE_ENDIAN 62 63 #endif /* TARGET_BYTES_BIG_ENDIAN. */ 64 65 /* The endianness of the target format may change based on command 66 line arguments. */ 67 extern const char *arc_target_format; 68 69 /* This macro is the BFD target name to use when creating the output 70 file. This will normally depend upon the `OBJ_FMT' macro. */ 71 #define TARGET_FORMAT arc_target_format 72 73 /* `md_short_jump_size' 74 `md_long_jump_size' 75 `md_create_short_jump' 76 `md_create_long_jump' 77 78 If `WORKING_DOT_WORD' is defined, GAS will not do broken word 79 processing (*note Broken words::.). Otherwise, you should set 80 `md_short_jump_size' to the size of a short jump (a jump that is 81 just long enough to jump around a long jmp) and `md_long_jump_size' 82 to the size of a long jump (a jump that can go anywhere in the 83 function). You should define `md_create_short_jump' to create a 84 short jump around a long jump, and define `md_create_long_jump' to 85 create a long jump. */ 86 #define WORKING_DOT_WORD 87 88 #define LISTING_HEADER "ARC GAS " 89 90 /* The number of bytes to put into a word in a listing. This affects 91 the way the bytes are clumped together in the listing. For 92 example, a value of 2 might print `1234 5678' where a value of 1 93 would print `12 34 56 78'. The default value is 4. */ 94 #define LISTING_WORD_SIZE 2 95 96 /* If you define this macro, it should return the position from which 97 the PC relative adjustment for a PC relative fixup should be made. 98 On many processors, the base of a PC relative instruction is the 99 next instruction, so this macro would return the length of an 100 instruction, plus the address of the PC relative fixup. The latter 101 can be calculated as fixp->fx_where + 102 fixp->fx_frag->fr_address. */ 103 extern long md_pcrel_from_section (struct fix *, segT); 104 #define MD_PCREL_FROM_SECTION(FIX, SEC) md_pcrel_from_section (FIX, SEC) 105 106 /* [ ] is index operator. */ 107 #define NEED_INDEX_OPERATOR 108 109 #define MAX_MEM_FOR_RS_ALIGN_CODE (1+2) 110 111 /* HANDLE_ALIGN called after all the assembly has been done, 112 so we can fill in all the rs_align_code type frags with 113 nop instructions. */ 114 #define HANDLE_ALIGN(FRAGP) arc_handle_align (FRAGP) 115 116 /* Values passed to md_apply_fix3 don't include the symbol value. */ 117 #define MD_APPLY_SYM_VALUE(FIX) 0 118 119 /* No shared lib support, so we don't need to ensure externally 120 visible symbols can be overridden. */ 121 #define EXTERN_FORCE_RELOC 0 122 123 /* You may define this macro to generate a fixup for a data allocation 124 pseudo-op. */ 125 #define TC_CONS_FIX_NEW(FRAG, OFF, LEN, EXP, RELOC) \ 126 arc_cons_fix_new ((FRAG), (OFF), (LEN), (EXP), (RELOC)) 127 128 /* We don't want gas to fixup the following program memory related 129 relocations. Check also that fx_addsy is not NULL, in order to 130 make sure that the fixup refers to some sort of label. */ 131 #define TC_VALIDATE_FIX(FIXP,SEG,SKIP) \ 132 if ((FIXP->fx_r_type == BFD_RELOC_ARC_GOTPC32 \ 133 || FIXP->fx_r_type == BFD_RELOC_ARC_PLT32 \ 134 || FIXP->fx_r_type == BFD_RELOC_ARC_S25W_PCREL_PLT \ 135 || FIXP->fx_r_type == BFD_RELOC_ARC_S25H_PCREL_PLT \ 136 || FIXP->fx_r_type == BFD_RELOC_ARC_S21W_PCREL_PLT \ 137 || FIXP->fx_r_type == BFD_RELOC_ARC_S21H_PCREL_PLT) \ 138 && FIXP->fx_addsy != NULL \ 139 && FIXP->fx_subsy == NULL) \ 140 { \ 141 symbol_mark_used_in_reloc (FIXP->fx_addsy); \ 142 goto SKIP; \ 143 } 144 145 /* BFD_RELOC_ARC_TLS_GD_LD may use fx_subsy to store a label that is 146 later turned into fx_offset. */ 147 #define TC_FORCE_RELOCATION_SUB_LOCAL(FIX, SEG) \ 148 ((FIX)->fx_r_type == BFD_RELOC_ARC_TLS_GD_LD) 149 150 #define TC_VALIDATE_FIX_SUB(FIX, SEG) \ 151 ((md_register_arithmetic || (SEG) != reg_section) \ 152 && ((FIX)->fx_r_type == BFD_RELOC_GPREL32 \ 153 || (FIX)->fx_r_type == BFD_RELOC_GPREL16 \ 154 || (FIX)->fx_r_type == BFD_RELOC_ARC_TLS_DTPOFF \ 155 || (FIX)->fx_r_type == BFD_RELOC_ARC_TLS_DTPOFF_S9 \ 156 || TC_FORCE_RELOCATION_SUB_LOCAL (FIX, SEG))) 157 158 /* We use this to mark the end-loop label. We use this mark for ZOL 159 validity checks. */ 160 #define TC_SYMFIELD_TYPE unsigned int 161 #define ARC_GET_FLAG(s) (*symbol_get_tc (s)) 162 #define ARC_SET_FLAG(s,v) (*symbol_get_tc (s) |= (v)) 163 164 /* The symbol is a ZOL's end loop label. */ 165 #define ARC_FLAG_ZOL (1 << 0) 166 /* The symbol is an AUX register. */ 167 #define ARC_FLAG_AUX (1 << 1) 168 169 /* We use this hook to check the validity of the last to instructions 170 of a ZOL. */ 171 #define tc_frob_label(S) arc_frob_label (S) 172 173 #define GLOBAL_OFFSET_TABLE_NAME "_GLOBAL_OFFSET_TABLE_" 174 #define DYNAMIC_STRUCT_NAME "_DYNAMIC" 175 176 /* We need to take care of not having section relative fixups for the 177 fixups with respect to Position Independent Code. */ 178 #define tc_fix_adjustable(FIX) tc_arc_fix_adjustable(FIX) 179 180 /* This hook is required to parse register names as operands. */ 181 #define md_parse_name(name, exp, m, c) arc_parse_name (name, exp) 182 183 /* Used within frags to pass some information to some relaxation 184 machine dependent values. */ 185 #define TC_FRAG_TYPE struct arc_relax_type 186 187 /* Adjust non PC-rel values at relaxation time. */ 188 #define TC_PCREL_ADJUST(F) arc_pcrel_adjust (F) 189 190 /* Adjust symbol table. */ 191 #define obj_adjust_symtab() arc_adjust_symtab () 192 193 extern void arc_adjust_symtab (void); 194 extern int arc_pcrel_adjust (fragS *); 195 extern bfd_boolean arc_parse_name (const char *, struct expressionS *); 196 extern int tc_arc_fix_adjustable (struct fix *); 197 extern void arc_handle_align (fragS *); 198 extern void arc_cons_fix_new (fragS *, int, int, expressionS *, 199 bfd_reloc_code_real_type); 200 extern void arc_frob_label (symbolS *); 201 extern void tc_arc_frame_initial_instructions (void); 202 extern int tc_arc_regname_to_dw2regnum (char *regname); 203 204 /* The blink register is r31. */ 205 #define DWARF2_DEFAULT_RETURN_COLUMN 31 206 /* Registers are generally saved at negative offsets to the CFA. */ 207 #define DWARF2_CIE_DATA_ALIGNMENT (-4) 208 209 /* We want .cfi_* pseudo-ops for generating unwind info. */ 210 #define TARGET_USE_CFIPOP 1 211 212 /* CFI hooks. */ 213 #define tc_cfi_frame_initial_instructions tc_arc_frame_initial_instructions 214 #define tc_regname_to_dw2regnum tc_arc_regname_to_dw2regnum 215 216 /* Define the NOPs. */ 217 #define NOP_OPCODE_S 0x000078E0 218 #define NOP_OPCODE_L 0x264A7000 /* mov 0,0. */ 219 220 #define MAX_FLAG_NAME_LENGTH 7 221 222 struct arc_flags 223 { 224 /* Name of the parsed flag. */ 225 char name[MAX_FLAG_NAME_LENGTH + 1]; 226 227 /* Pointer to arc flags. */ 228 const struct arc_flag_operand *flgp; 229 }; 230 231 extern const relax_typeS md_relax_table[]; 232 #define TC_GENERIC_RELAX_TABLE md_relax_table 233 234 /* Used to construct instructions at md_convert_frag stage of 235 relaxation. */ 236 struct arc_relax_type 237 { 238 /* Dictates whether the pc-relativity should be kept in mind when 239 relax_frag is called or whether the pc-relativity should be 240 solved outside of relaxation. For clarification: BL(_S) and 241 B(_S) use pcrel == 1 and ADD with a solvable expression as 3rd 242 operand use pcrel == 0. */ 243 unsigned char pcrel; 244 245 /* Expressions that dictate the operands. Used for re-assembling in 246 md_convert_frag. */ 247 expressionS tok[MAX_INSN_ARGS]; 248 249 /* Number of tok (i.e. number of operands). Used for re-assembling 250 in md_convert_frag. */ 251 int ntok; 252 253 /* Flags of instruction. Used for re-assembling in 254 md_convert_frag. */ 255 struct arc_flags pflags[MAX_INSN_FLGS]; 256 257 /* Number of flags. Used for re-assembling in md_convert_frag. */ 258 int nflg; 259 }; 260