| 1 | /* tc-nds32.h -- Header file for tc-nds32.c. |
| 2 | Copyright (C) 2012-2015 Free Software Foundation, Inc. |
| 3 | Contributed by Andes Technology Corporation. |
| 4 | |
| 5 | This file is part of GAS. |
| 6 | |
| 7 | GAS is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 3, or (at your option) |
| 10 | any later version. |
| 11 | |
| 12 | GAS is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with GAS; see the file COPYING. If not, write to the Free |
| 19 | Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA |
| 20 | 02110-1301, USA. */ |
| 21 | |
| 22 | #ifndef TC_NDS32 |
| 23 | #define TC_NDS32 |
| 24 | |
| 25 | #include "bfd_stdint.h" |
| 26 | |
| 27 | #define LISTING_HEADER \ |
| 28 | (target_big_endian ? "NDS32 GAS" : "NDS32 GAS Little Endian") |
| 29 | |
| 30 | /* The target BFD architecture. */ |
| 31 | #define TARGET_ARCH bfd_arch_nds32 |
| 32 | |
| 33 | /* mapping to mach_table[5] */ |
| 34 | #define ISA_V1 bfd_mach_n1h |
| 35 | #define ISA_V2 bfd_mach_n1h_v2 |
| 36 | #define ISA_V3 bfd_mach_n1h_v3 |
| 37 | #define ISA_V3M bfd_mach_n1h_v3m |
| 38 | |
| 39 | /* Default to big endian. Please note that for Andes architecture, |
| 40 | instructions are always in big-endian format. */ |
| 41 | #ifndef TARGET_BYTES_BIG_ENDIAN |
| 42 | #define TARGET_BYTES_BIG_ENDIAN 1 |
| 43 | #endif |
| 44 | |
| 45 | /* as.c. */ |
| 46 | /* Extend GAS command line option handling capability. */ |
| 47 | extern int nds32_parse_option (int, char *); |
| 48 | extern void nds32_after_parse_args (void); |
| 49 | /* The endianness of the target format may change based on command |
| 50 | line arguments. */ |
| 51 | extern const char * nds32_target_format (void); |
| 52 | |
| 53 | #define md_parse_option(optc, optarg) nds32_parse_option (optc, optarg) |
| 54 | #define md_after_parse_args() nds32_after_parse_args () |
| 55 | #define TARGET_FORMAT nds32_target_format() |
| 56 | |
| 57 | /* expr.c */ |
| 58 | extern int nds32_parse_name (char const *, expressionS *, enum expr_mode, char *); |
| 59 | extern bfd_boolean nds32_allow_local_subtract (expressionS *, expressionS *, segT); |
| 60 | #define md_parse_name(name, exprP, mode, nextcharP) \ |
| 61 | nds32_parse_name (name, exprP, mode, nextcharP) |
| 62 | #define md_allow_local_subtract(lhs,rhs,sect) nds32_allow_local_subtract (lhs, rhs, sect) |
| 63 | |
| 64 | /* dwarf2dbg.c. */ |
| 65 | #define DWARF2_USE_FIXED_ADVANCE_PC 1 |
| 66 | |
| 67 | /* write.c. */ |
| 68 | extern long nds32_pcrel_from_section (struct fix *, segT); |
| 69 | extern bfd_boolean nds32_fix_adjustable (struct fix *); |
| 70 | extern void nds32_frob_file (void); |
| 71 | extern void nds32_post_relax_hook (void); |
| 72 | extern void nds32_frob_file_before_fix (void); |
| 73 | extern void elf_nds32_final_processing (void); |
| 74 | extern int nds32_validate_fix_sub (struct fix *, segT); |
| 75 | extern int nds32_force_relocation (struct fix *); |
| 76 | extern void nds32_set_section_relocs (asection *, arelent ** , unsigned int); |
| 77 | |
| 78 | /* Fill in rs_align_code fragments. TODO: Review this. */ |
| 79 | extern void nds32_handle_align (fragS *); |
| 80 | extern int nds32_relax_frag (segT, fragS *, long); |
| 81 | extern int tc_nds32_regname_to_dw2regnum (char *); |
| 82 | extern void tc_nds32_frame_initial_instructions (void); |
| 83 | |
| 84 | #define MD_PCREL_FROM_SECTION(fix, sect) nds32_pcrel_from_section (fix, sect) |
| 85 | #define TC_FINALIZE_SYMS_BEFORE_SIZE_SEG 0 |
| 86 | #define tc_fix_adjustable(FIX) nds32_fix_adjustable (FIX) |
| 87 | #define md_apply_fix(fixP, addn, seg) nds32_apply_fix (fixP, addn, seg) |
| 88 | #define md_post_relax_hook nds32_post_relax_hook () |
| 89 | #define tc_frob_file_before_fix() nds32_frob_file_before_fix () |
| 90 | #define elf_tc_final_processing() elf_nds32_final_processing () |
| 91 | /* For DIFF relocations. The default behavior is inconsistent with the |
| 92 | asm internal document. */ |
| 93 | #define TC_FORCE_RELOCATION_SUB_SAME(FIX, SEC) \ |
| 94 | (! SEG_NORMAL (SEC) || TC_FORCE_RELOCATION (FIX)) |
| 95 | #define TC_FORCE_RELOCATION(fix) nds32_force_relocation (fix) |
| 96 | #define TC_VALIDATE_FIX_SUB(FIX,SEG) nds32_validate_fix_sub (FIX,SEG) |
| 97 | #define SET_SECTION_RELOCS(sec, relocs, n) nds32_set_section_relocs (sec, relocs, n) |
| 98 | /* Values passed to md_apply_fix don't include the symbol value. */ |
| 99 | #define MD_APPLY_SYM_VALUE(FIX) 0 |
| 100 | #define HANDLE_ALIGN(f) nds32_handle_align (f) |
| 101 | #undef DIFF_EXPR_OK /* They should be fixed in linker. */ |
| 102 | #define md_relax_frag(segment, fragP, stretch) nds32_relax_frag (segment, fragP, stretch) |
| 103 | #define WORKING_DOT_WORD /* We don't need to handle .word strangely. */ |
| 104 | /* Using to chain fixup with previous fixup. */ |
| 105 | #define TC_FIX_TYPE struct fix * |
| 106 | #define TC_INIT_FIX_DATA(fixP) \ |
| 107 | do \ |
| 108 | { \ |
| 109 | fixP->tc_fix_data = NULL; \ |
| 110 | } \ |
| 111 | while (0) |
| 112 | |
| 113 | /* read.c. */ |
| 114 | /* Extend GAS macro handling capability. */ |
| 115 | extern void nds32_macro_start (void); |
| 116 | extern void nds32_macro_end (void); |
| 117 | extern void nds32_macro_info (void *); |
| 118 | extern void nds32_start_line_hook (void); |
| 119 | extern void nds32_elf_section_change_hook (void); |
| 120 | extern void md_begin (void); |
| 121 | extern void md_end (void); |
| 122 | extern int nds32_start_label (int, int); |
| 123 | extern void nds32_cleanup (void); |
| 124 | extern void nds32_flush_pending_output (void); |
| 125 | extern void nds32_cons_align (int); |
| 126 | extern void nds32_check_label (symbolS *); |
| 127 | extern void nds32_frob_label (symbolS *); |
| 128 | extern void nds32_pre_do_align (int, char *, int, int); |
| 129 | extern void nds32_do_align (int); |
| 130 | |
| 131 | #define md_macro_start() nds32_macro_start () |
| 132 | #define md_macro_end() nds32_macro_end () |
| 133 | #define md_macro_info(args) nds32_macro_info (args) |
| 134 | #define TC_START_LABEL(C, S, STR) (C == ':' && nds32_start_label (0, 0)) |
| 135 | #define tc_check_label(label) nds32_check_label (label) |
| 136 | #define tc_frob_label(label) nds32_frob_label (label) |
| 137 | #define md_end md_end |
| 138 | #define md_start_line_hook() nds32_start_line_hook () |
| 139 | #define md_cons_align(n) nds32_cons_align (n) |
| 140 | /* COLE: TODO: Review md_do_align. */ |
| 141 | #define md_do_align(N, FILL, LEN, MAX, LABEL) \ |
| 142 | nds32_pre_do_align (N, FILL, LEN, MAX); \ |
| 143 | if ((N) > 1 && (subseg_text_p (now_seg) \ |
| 144 | || strncmp (now_seg->name, ".gcc_except_table", sizeof(".gcc_except_table") - 1) == 0)) \ |
| 145 | nds32_do_align (N); \ |
| 146 | goto LABEL; |
| 147 | #define md_elf_section_change_hook() nds32_elf_section_change_hook () |
| 148 | #define md_flush_pending_output() nds32_flush_pending_output () |
| 149 | #define md_cleanup() nds32_cleanup () |
| 150 | #define LOCAL_LABELS_FB 1 /* Permit temporary numeric labels. */ |
| 151 | |
| 152 | /* frags.c. */ |
| 153 | |
| 154 | #define NDS32_FRAG_RELAXABLE 0x1 |
| 155 | #define NDS32_FRAG_RELAXED 0x2 |
| 156 | #define NDS32_FRAG_BRANCH 0x4 |
| 157 | #define NDS32_FRAG_LABEL 0x8 |
| 158 | |
| 159 | struct nds32_frag_type |
| 160 | { |
| 161 | relax_substateT flag; |
| 162 | struct nds32_opcode *opcode; |
| 163 | uint32_t insn; |
| 164 | /* To Save previos label fixup if existence. */ |
| 165 | struct fix *fixup; |
| 166 | }; |
| 167 | |
| 168 | extern void nds32_frag_init (fragS *); |
| 169 | |
| 170 | #define TC_FRAG_TYPE struct nds32_frag_type |
| 171 | #define TC_FRAG_INIT(fragP) nds32_frag_init (fragP) |
| 172 | |
| 173 | /* CFI directive. */ |
| 174 | extern void nds32_elf_frame_initial_instructions (void); |
| 175 | extern int tc_nds32_regname_to_dw2regnum (char *); |
| 176 | |
| 177 | #define TARGET_USE_CFIPOP 1 |
| 178 | #define DWARF2_DEFAULT_RETURN_COLUMN 30 |
| 179 | #define DWARF2_CIE_DATA_ALIGNMENT -4 |
| 180 | #define DWARF2_LINE_MIN_INSN_LENGTH 2 |
| 181 | |
| 182 | #define tc_regname_to_dw2regnum tc_nds32_regname_to_dw2regnum |
| 183 | #define tc_cfi_frame_initial_instructions tc_nds32_frame_initial_instructions |
| 184 | |
| 185 | /* COLE: TODO: Review These. They seem to be obsoleted. */ |
| 186 | #if 1 |
| 187 | #define TC_RELOC_RTSYM_LOC_FIXUP(FIX) \ |
| 188 | ((FIX)->fx_addsy == NULL \ |
| 189 | || (! S_IS_EXTERNAL ((FIX)->fx_addsy) \ |
| 190 | && ! S_IS_WEAK ((FIX)->fx_addsy) \ |
| 191 | && S_IS_DEFINED ((FIX)->fx_addsy) \ |
| 192 | && ! S_IS_COMMON ((FIX)->fx_addsy))) |
| 193 | #define TC_HANDLES_FX_DONE |
| 194 | /* This arranges for gas/write.c to not apply a relocation if |
| 195 | obj_fix_adjustable() says it is not adjustable. */ |
| 196 | #define TC_FIX_ADJUSTABLE(fixP) obj_fix_adjustable (fixP) |
| 197 | #endif |
| 198 | |
| 199 | /* Because linker may relax the code, assemble-time expression |
| 200 | optimization is not allowed. */ |
| 201 | #define md_allow_eh_opt 0 |
| 202 | |
| 203 | /* For nds32 relax. */ |
| 204 | enum nds32_br_range |
| 205 | { |
| 206 | BR_RANGE_S256 = 0, |
| 207 | BR_RANGE_S16K, |
| 208 | BR_RANGE_S64K, |
| 209 | BR_RANGE_S16M, |
| 210 | BR_RANGE_U4G, |
| 211 | BR_RANGE_NUM |
| 212 | }; |
| 213 | |
| 214 | enum nds32_ramp |
| 215 | { |
| 216 | NDS32_CREATE_LABEL = 1, |
| 217 | NDS32_RELAX = (1 << 1), /* Obsolete in the future. */ |
| 218 | NDS32_ORIGIN = (1 << 2), |
| 219 | NDS32_INSN16 = (1 << 3), |
| 220 | NDS32_PTR = (1 << 4), |
| 221 | NDS32_ABS = (1 << 5), |
| 222 | NDS32_HINT = (1 << 6), |
| 223 | NDS32_FIX = (1 << 7), |
| 224 | NDS32_ADDEND = (1 << 8), |
| 225 | NDS32_SYM = (1 << 9) |
| 226 | }; |
| 227 | |
| 228 | typedef struct nds32_relax_fixup_info |
| 229 | { |
| 230 | int offset; |
| 231 | int size; |
| 232 | /* Reverse branch has to jump to the end of instruction pattern. */ |
| 233 | int ramp; |
| 234 | enum bfd_reloc_code_real r_type; |
| 235 | } nds32_relax_fixup_info_t; |
| 236 | |
| 237 | typedef struct nds32_cond_field |
| 238 | { |
| 239 | int offset; |
| 240 | int bitpos; /* Register position. */ |
| 241 | int bitmask; /* Number of register bits. */ |
| 242 | bfd_boolean signed_extend; |
| 243 | } nds32_cond_field_t; |
| 244 | |
| 245 | /* The max relaxation pattern is 20-bytes including the nop. */ |
| 246 | #define NDS32_MAXCHAR 20 |
| 247 | /* In current, the max entend number of instruction for one pseudo instruction |
| 248 | is 4, but its number of relocation may be 12. */ |
| 249 | #define MAX_RELAX_NUM 4 |
| 250 | #define MAX_RELAX_FIX 12 |
| 251 | |
| 252 | typedef struct nds32_relax_info |
| 253 | { |
| 254 | /* Opcode for the instruction. */ |
| 255 | const char *opcode; |
| 256 | enum nds32_br_range br_range; |
| 257 | nds32_cond_field_t cond_field[MAX_RELAX_NUM]; /* TODO: Reuse nds32_field? */ |
| 258 | /* Code sequences for different branch range. */ |
| 259 | uint32_t relax_code_seq[BR_RANGE_NUM][MAX_RELAX_NUM]; |
| 260 | nds32_cond_field_t relax_code_condition[BR_RANGE_NUM][MAX_RELAX_NUM]; |
| 261 | unsigned int relax_code_size[BR_RANGE_NUM]; |
| 262 | int relax_branch_isize[BR_RANGE_NUM]; |
| 263 | nds32_relax_fixup_info_t relax_fixup[BR_RANGE_NUM][MAX_RELAX_FIX]; |
| 264 | } relax_info_t; |
| 265 | |
| 266 | enum nds32_relax_hint_type |
| 267 | { |
| 268 | NDS32_RELAX_HINT_NONE = 0, |
| 269 | NDS32_RELAX_HINT_LA, |
| 270 | NDS32_RELAX_HINT_LS |
| 271 | }; |
| 272 | |
| 273 | struct nds32_relax_hint_table |
| 274 | { |
| 275 | enum nds32_relax_hint_type main_type; |
| 276 | unsigned int relax_code_size; |
| 277 | uint32_t relax_code_seq[MAX_RELAX_NUM]; |
| 278 | nds32_relax_fixup_info_t relax_fixup[MAX_RELAX_FIX]; |
| 279 | }; |
| 280 | |
| 281 | #endif /* TC_NDS32 */ |