gas/config/tc-nds32.h

   1 /* tc-nds32.h -- Header file for tc-nds32.c.
   2    Copyright (C) 2012-2021 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 /* Enum mapping symbol.  */
  28 enum mstate
  29 {
  30   MAP_UNDEFINED = 0,    /* Must be zero, for seginfo in new sections.  */
  31   MAP_DATA,
  32   MAP_CODE,
  33 };
  34 #define TC_SEGMENT_INFO_TYPE struct nds32_segment_info_type
  35
  36 /* For mapping symbol.  */
  37 struct nds32_segment_info_type
  38 {
  39   enum mstate mapstate;
  40 };
  41
  42 #define LISTING_HEADER \
  43   (target_big_endian ? "NDS32 GAS" : "NDS32 GAS Little Endian")
  44
  45 /* The target BFD architecture.  */
  46 #define TARGET_ARCH             bfd_arch_nds32
  47
  48 /* mapping to mach_table[5] */
  49 #define ISA_V1      bfd_mach_n1h
  50 #define ISA_V2      bfd_mach_n1h_v2
  51 #define ISA_V3      bfd_mach_n1h_v3
  52 #define ISA_V3M     bfd_mach_n1h_v3m
  53
  54 /* Default to big endian. Please note that for Andes architecture,
  55    instructions are always in big-endian format.  */
  56 #ifndef TARGET_BYTES_BIG_ENDIAN
  57 #define TARGET_BYTES_BIG_ENDIAN 1
  58 #endif
  59
  60 /* as.c.  */
  61 /* Extend GAS command line option handling capability.  */
  62 extern int nds32_parse_option (int, const char *);
  63 extern void nds32_after_parse_args (void);
  64 /* The endianness of the target format may change based on command
  65    line arguments.  */
  66 extern const char * nds32_target_format (void);
  67
  68 #define md_parse_option(optc, optarg)   nds32_parse_option (optc, optarg)
  69 #define md_after_parse_args()           nds32_after_parse_args ()
  70 #define TARGET_FORMAT nds32_target_format()
  71
  72 /* expr.c */
  73 extern int nds32_parse_name (char const *, expressionS *, enum expr_mode, char *);
  74 extern bfd_boolean nds32_allow_local_subtract (expressionS *, expressionS *, segT);
  75 #define md_parse_name(name, exprP, mode, nextcharP) \
  76         nds32_parse_name (name, exprP, mode, nextcharP)
  77 #define md_allow_local_subtract(lhs,rhs,sect)   nds32_allow_local_subtract (lhs, rhs, sect)
  78
  79 /* dwarf2dbg.c.  */
  80 #define DWARF2_USE_FIXED_ADVANCE_PC             1
  81
  82 /* write.c.  */
  83 extern long nds32_pcrel_from_section (struct fix *, segT);
  84 extern bfd_boolean nds32_fix_adjustable (struct fix *);
  85 extern void nds32_frob_file (void);
  86 extern void nds32_post_relax_hook (void);
  87 extern void nds32_frob_file_before_fix (void);
  88 extern void elf_nds32_final_processing (void);
  89 extern int nds32_validate_fix_sub (struct fix *, segT);
  90 extern int nds32_force_relocation (struct fix *);
  91 extern void nds32_set_section_relocs (asection *, arelent ** , unsigned int);
  92
  93 /* Fill in rs_align_code fragments.  TODO: Review this.  */
  94 extern void nds32_handle_align (fragS *);
  95 extern int nds32_relax_frag (segT, fragS *, long);
  96 extern int tc_nds32_regname_to_dw2regnum (char *);
  97 extern void tc_nds32_frame_initial_instructions (void);
  98
  99 #define MD_PCREL_FROM_SECTION(fix, sect)        nds32_pcrel_from_section (fix, sect)
 100 #define TC_FINALIZE_SYMS_BEFORE_SIZE_SEG        0
 101 #define tc_fix_adjustable(FIX)                  nds32_fix_adjustable (FIX)
 102 #define md_apply_fix(fixP, addn, seg)           nds32_apply_fix (fixP, addn, seg)
 103 #define md_post_relax_hook                      nds32_post_relax_hook ()
 104 #define tc_frob_file_before_fix()               nds32_frob_file_before_fix ()
 105 #define elf_tc_final_processing()               elf_nds32_final_processing ()
 106 /* For DIFF relocations.  The default behavior is inconsistent with the
 107    asm internal document.  */
 108 #define TC_FORCE_RELOCATION_SUB_SAME(FIX, SEC)          \
 109   (GENERIC_FORCE_RELOCATION_SUB_SAME (FIX, SEC)         \
 110    || TC_FORCE_RELOCATION (FIX))
 111 #define TC_FORCE_RELOCATION(fix)                nds32_force_relocation (fix)
 112 #define TC_VALIDATE_FIX_SUB(FIX,SEG)            nds32_validate_fix_sub (FIX,SEG)
 113 #define SET_SECTION_RELOCS(sec, relocs, n)      nds32_set_section_relocs (sec, relocs, n)
 114 /* Values passed to md_apply_fix don't include the symbol value.  */
 115 #define MD_APPLY_SYM_VALUE(FIX)                 0
 116 #define HANDLE_ALIGN(f)                         nds32_handle_align (f)
 117 #undef DIFF_EXPR_OK                             /* They should be fixed in linker.  */
 118 #define md_relax_frag(segment, fragP, stretch)  nds32_relax_frag (segment, fragP, stretch)
 119 #define WORKING_DOT_WORD                        /* We don't need to handle .word strangely.  */
 120 /* Using to chain fixup with previous fixup.  */
 121 #define TC_FIX_TYPE struct fix *
 122 #define TC_INIT_FIX_DATA(fixP)          \
 123   do                                    \
 124     {                                   \
 125       fixP->tc_fix_data = NULL;         \
 126     }                                   \
 127   while (0)
 128
 129 /* read.c.  */
 130 /* Extend GAS macro handling capability.  */
 131 extern void nds32_macro_start (void);
 132 extern void nds32_macro_end (void);
 133 extern void nds32_macro_info (void *);
 134 extern void nds32_start_line_hook (void);
 135 extern void nds32_elf_section_change_hook (void);
 136 extern void md_begin (void);
 137 extern void md_end (void);
 138 extern int nds32_start_label (int, int);
 139 extern void nds32_cleanup (void);
 140 extern void nds32_flush_pending_output (void);
 141 extern void nds32_cons_align (int);
 142 extern void nds32_check_label (symbolS *);
 143 extern void nds32_frob_label (symbolS *);
 144 extern void nds32_pre_do_align (int, char *, int, int);
 145 extern void nds32_do_align (int);
 146
 147 #define md_macro_start()                        nds32_macro_start ()
 148 #define md_macro_end()                          nds32_macro_end ()
 149 #define md_macro_info(args)                     nds32_macro_info (args)
 150 #define TC_START_LABEL(STR, NUL_CHAR, NEXT_CHAR)        \
 151   (NEXT_CHAR == ':' && nds32_start_label (0, 0))
 152 #define tc_check_label(label)                   nds32_check_label (label)
 153 #define tc_frob_label(label)                    nds32_frob_label (label)
 154 #define md_end                                  md_end
 155 #define md_start_line_hook()                    nds32_start_line_hook ()
 156 #define md_cons_align(n)                        nds32_cons_align (n)
 157 /* COLE: TODO: Review md_do_align.  */
 158 #define md_do_align(N, FILL, LEN, MAX, LABEL)   \
 159   nds32_pre_do_align (N, FILL, LEN, MAX);       \
 160   if ((N) > 1 && (subseg_text_p (now_seg)       \
 161       || strncmp (now_seg->name, ".gcc_except_table", sizeof(".gcc_except_table") - 1) == 0)) \
 162     nds32_do_align (N);                         \
 163   goto LABEL;
 164 #define md_elf_section_change_hook()            nds32_elf_section_change_hook ()
 165 #define md_flush_pending_output()               nds32_flush_pending_output ()
 166 #define md_cleanup()                            nds32_cleanup ()
 167 #define LOCAL_LABELS_FB                         1 /* Permit temporary numeric labels.  */
 168
 169 /* frags.c.  */
 170
 171 enum FRAG_ATTR
 172 {
 173   NDS32_FRAG_RELAXABLE  = 0x1,
 174   NDS32_FRAG_RELAXED = 0x2,
 175   NDS32_FRAG_BRANCH = 0x4,
 176   NDS32_FRAG_LABEL = 0x8,
 177   NDS32_FRAG_FINAL = 0x10,
 178   NDS32_FRAG_RELAXABLE_BRANCH = 0x20,
 179   NDS32_FRAG_ALIGN = 0x40
 180 };
 181
 182 struct nds32_frag_type
 183 {
 184   relax_substateT flag;
 185   struct nds32_opcode *opcode;
 186   uint32_t insn;
 187   /* To Save previous label fixup if existence.  */
 188   struct fix *fixup;
 189 };
 190
 191 extern void nds32_frag_init (fragS *);
 192
 193 #define TC_FRAG_TYPE                            struct nds32_frag_type
 194 #define TC_FRAG_INIT(fragP, max_bytes)          nds32_frag_init (fragP)
 195
 196 /* CFI directive.  */
 197 extern void nds32_elf_frame_initial_instructions (void);
 198 extern int tc_nds32_regname_to_dw2regnum (char *);
 199
 200 #define TARGET_USE_CFIPOP                       1
 201 #define DWARF2_DEFAULT_RETURN_COLUMN            30
 202 #define DWARF2_CIE_DATA_ALIGNMENT               -4
 203 #define DWARF2_LINE_MIN_INSN_LENGTH             2
 204
 205 #define tc_regname_to_dw2regnum                 tc_nds32_regname_to_dw2regnum
 206 #define tc_cfi_frame_initial_instructions       tc_nds32_frame_initial_instructions
 207
 208 /* COLE: TODO: Review These. They seem to be obsoleted.  */
 209 #if 1
 210 #define TC_RELOC_RTSYM_LOC_FIXUP(FIX)                           \
 211    ((FIX)->fx_addsy == NULL                                     \
 212     || (! S_IS_EXTERNAL ((FIX)->fx_addsy)                       \
 213         && ! S_IS_WEAK ((FIX)->fx_addsy)                        \
 214         && S_IS_DEFINED ((FIX)->fx_addsy)                       \
 215         && ! S_IS_COMMON ((FIX)->fx_addsy)))
 216 #define TC_HANDLES_FX_DONE
 217 /* This arranges for gas/write.c to not apply a relocation if
 218    obj_fix_adjustable() says it is not adjustable.  */
 219 #define TC_FIX_ADJUSTABLE(fixP) obj_fix_adjustable (fixP)
 220 #endif
 221
 222 /* Because linker may relax the code, assemble-time expression
 223    optimization is not allowed.  */
 224 #define md_allow_eh_opt 0
 225
 226 /* For nds32 relax.  */
 227 enum nds32_br_range
 228 {
 229   BR_RANGE_S256 = 0,
 230   BR_RANGE_S16K,
 231   BR_RANGE_S64K,
 232   BR_RANGE_S16M,
 233   BR_RANGE_U4G,
 234   BR_RANGE_NUM
 235 };
 236
 237 enum nds32_ramp
 238 {
 239   NDS32_CREATE_LABEL = 1,
 240   NDS32_RELAX = (1 << 1), /* Obsolete in the future.  */
 241   NDS32_ORIGIN = (1 << 2),
 242   NDS32_INSN16 = (1 << 3),
 243   NDS32_PTR = (1 << 4),
 244   NDS32_ABS = (1 << 5),
 245   NDS32_HINT = (1 << 6),
 246   NDS32_FIX = (1 << 7),
 247   NDS32_ADDEND = (1 << 8),
 248   NDS32_SYM = (1 << 9),
 249   NDS32_PCREL = (1 << 10),
 250   NDS32_PTR_PATTERN = (1 << 11),
 251   NDS32_PTR_MULTIPLE = (1 << 12),
 252   NDS32_GROUP = (1 << 13),
 253   NDS32_SYM_DESC_MEM = (1 << 14)
 254 };
 255
 256 typedef struct nds32_relax_fixup_info
 257 {
 258   int offset;
 259   int size;
 260   /* Reverse branch has to jump to the end of instruction pattern.  */
 261   int ramp;
 262   enum bfd_reloc_code_real r_type;
 263 } nds32_relax_fixup_info_t;
 264
 265 typedef struct nds32_cond_field
 266 {
 267   int offset;
 268   int bitpos; /* Register position.  */
 269   int bitmask; /* Number of register bits.  */
 270   bfd_boolean signed_extend;
 271 } nds32_cond_field_t;
 272
 273 /* The max relaxation pattern is 20-bytes including the nop.  */
 274 #define NDS32_MAXCHAR 20
 275 /* In current, the max extended number of instruction for one pseudo instruction
 276    is 6, but its number of relocation may be 12.  */
 277 #define MAX_RELAX_NUM 6
 278 #define MAX_RELAX_FIX 12
 279
 280 typedef struct nds32_relax_info
 281 {
 282   /* Opcode for the instruction.  */
 283   const char *opcode;
 284   enum nds32_br_range br_range;
 285   nds32_cond_field_t cond_field[MAX_RELAX_NUM]; /* TODO: Reuse nds32_field?  */
 286   /* Code sequences for different branch range.  */
 287   uint32_t relax_code_seq[BR_RANGE_NUM][MAX_RELAX_NUM];
 288   nds32_cond_field_t relax_code_condition[BR_RANGE_NUM][MAX_RELAX_NUM];
 289   unsigned int relax_code_size[BR_RANGE_NUM];
 290   int relax_branch_isize[BR_RANGE_NUM];
 291   nds32_relax_fixup_info_t relax_fixup[BR_RANGE_NUM][MAX_RELAX_FIX];
 292 } relax_info_t;
 293
 294 enum nds32_relax_hint_type
 295 {
 296   NDS32_RELAX_HINT_NONE = 0,
 297   NDS32_RELAX_HINT_LA_FLSI,
 298   NDS32_RELAX_HINT_LALS,
 299   NDS32_RELAX_HINT_LA_PLT,
 300   NDS32_RELAX_HINT_LA_GOT,
 301   NDS32_RELAX_HINT_LA_GOTOFF,
 302   NDS32_RELAX_HINT_TLS_START = 0x100,
 303   NDS32_RELAX_HINT_TLS_LE_LS,
 304   NDS32_RELAX_HINT_TLS_IE_LS,
 305   NDS32_RELAX_HINT_TLS_IE_LA,
 306   NDS32_RELAX_HINT_TLS_IEGP_LA,
 307   NDS32_RELAX_HINT_TLS_DESC_LS,
 308 };
 309
 310 struct nds32_relax_hint_table
 311 {
 312   enum nds32_relax_hint_type main_type;
 313   unsigned int relax_code_size;
 314   uint32_t relax_code_seq[MAX_RELAX_NUM];
 315   nds32_relax_fixup_info_t relax_fixup[MAX_RELAX_FIX];
 316 };
 317
 318 #endif /* TC_NDS32 */