gas/config/tc-nds32.h

   1 /* tc-nds32.h -- Header file for tc-nds32.c.
   2    Copyright (C) 2012-2013 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 /* This is used to construct expressions out of @GOTOFF, @PLT and @GOT
  46    symbols.  The relocation type is stored in X_md.  */
  47 #define O_PIC_reloc O_md1
  48
  49 /* as.c.  */
  50 /* Extend GAS command line option handling capability.  */
  51 extern int nds32_parse_option (int, char *);
  52 extern void nds32_after_parse_args (void);
  53 /* The endianness of the target format may change based on command
  54    line arguments.  */
  55 extern const char * nds32_target_format (void);
  56
  57 #define md_parse_option(optc, optarg)   nds32_parse_option (optc, optarg)
  58 #define md_after_parse_args()           nds32_after_parse_args ()
  59 #define TARGET_FORMAT nds32_target_format()
  60
  61 /* expr.c */
  62 extern int nds32_parse_name (char const *, expressionS *, enum expr_mode, char *);
  63 extern bfd_boolean nds32_allow_local_subtract (expressionS *, expressionS *, segT);
  64 #define md_parse_name(name, exprP, mode, nextcharP) \
  65         nds32_parse_name (name, exprP, mode, nextcharP)
  66 #define md_allow_local_subtract(lhs,rhs,sect)   nds32_allow_local_subtract (lhs, rhs, sect)
  67
  68 /* dwarf2dbg.c.  */
  69 #define DWARF2_USE_FIXED_ADVANCE_PC             1
  70
  71 /* write.c.  */
  72 extern long nds32_pcrel_from_section (struct fix *, segT);
  73 extern bfd_boolean nds32_fix_adjustable (struct fix *);
  74 extern void nds32_frob_file (void);
  75 extern void nds32_post_relax_hook (void);
  76 extern void nds32_frob_file_before_fix (void);
  77 extern void elf_nds32_final_processing (void);
  78 extern int nds32_validate_fix_sub (struct fix *, segT);
  79 extern int nds32_force_relocation (struct fix *);
  80 extern void nds32_set_section_relocs (asection *, arelent ** , unsigned int);
  81
  82 /* Fill in rs_align_code fragments.  TODO: Review this.  */
  83 extern void nds32_handle_align (fragS *);
  84 extern int nds32_relax_frag (segT, fragS *, long);
  85 extern int tc_nds32_regname_to_dw2regnum (char *);
  86 extern void tc_nds32_frame_initial_instructions (void);
  87
  88 #define MD_PCREL_FROM_SECTION(fix, sect)        nds32_pcrel_from_section (fix, sect)
  89 #define TC_FINALIZE_SYMS_BEFORE_SIZE_SEG        0
  90 #define tc_fix_adjustable(FIX)                  nds32_fix_adjustable (FIX)
  91 #define md_apply_fix(fixP, addn, seg)           nds32_apply_fix (fixP, addn, seg)
  92 #define md_post_relax_hook                      nds32_post_relax_hook ()
  93 #define tc_frob_file_before_fix()               nds32_frob_file_before_fix ()
  94 #define elf_tc_final_processing()               elf_nds32_final_processing ()
  95 /* For DIFF relocations.  The default behavior is inconsistent with the
  96    asm internal document.  */
  97 #define TC_FORCE_RELOCATION_SUB_SAME(FIX, SEC)          \
  98   (! SEG_NORMAL (SEC) || TC_FORCE_RELOCATION (FIX))
  99 #define TC_FORCE_RELOCATION(fix)                nds32_force_relocation (fix)
 100 #define TC_VALIDATE_FIX_SUB(FIX,SEG)            nds32_validate_fix_sub (FIX,SEG)
 101 #define SET_SECTION_RELOCS(sec, relocs, n)      nds32_set_section_relocs (sec, relocs, n)
 102 /* Values passed to md_apply_fix don't include the symbol value.  */
 103 #define MD_APPLY_SYM_VALUE(FIX)                 0
 104 #define HANDLE_ALIGN(f)                         nds32_handle_align (f)
 105 #undef DIFF_EXPR_OK                             /* They should be fixed in linker.  */
 106 #define md_relax_frag(segment, fragP, stretch)  nds32_relax_frag (segment, fragP, stretch)
 107 #define WORKING_DOT_WORD                        /* We don't need to handle .word strangely.  */
 108 /* Using to chain fixup with previous fixup.  */
 109 #define TC_FIX_TYPE struct fix *
 110 #define TC_INIT_FIX_DATA(fixP)          \
 111   do                                    \
 112     {                                   \
 113       fixP->tc_fix_data = NULL;         \
 114     }                                   \
 115   while (0)
 116
 117 /* read.c.  */
 118 /* Extend GAS macro handling capability.  */
 119 extern void nds32_macro_start (void);
 120 extern void nds32_macro_end (void);
 121 extern void nds32_macro_info (void *);
 122 extern void nds32_start_line_hook (void);
 123 extern void nds32_elf_section_change_hook (void);
 124 extern void md_begin (void);
 125 extern void md_end (void);
 126 extern int nds32_start_label (int, int);
 127 extern void nds32_cleanup (void);
 128 extern void nds32_flush_pending_output (void);
 129 extern void nds32_cons_align (int);
 130 extern void nds32_check_label (symbolS *);
 131 extern void nds32_frob_label (symbolS *);
 132 extern void nds32_pre_do_align (int, char *, int, int);
 133 extern void nds32_do_align (int);
 134
 135 #define md_macro_start()                        nds32_macro_start ()
 136 #define md_macro_end()                          nds32_macro_end ()
 137 #define md_macro_info(args)                     nds32_macro_info (args)
 138 #define TC_START_LABEL(C, S, STR)               (C == ':' && nds32_start_label (0, 0))
 139 #define tc_check_label(label)                   nds32_check_label (label)
 140 #define tc_frob_label(label)                    nds32_frob_label (label)
 141 #define md_end                                  md_end
 142 #define md_start_line_hook()                    nds32_start_line_hook ()
 143 #define md_cons_align(n)                        nds32_cons_align (n)
 144 /* COLE: TODO: Review md_do_align.  */
 145 #define md_do_align(N, FILL, LEN, MAX, LABEL)   \
 146   nds32_pre_do_align (N, FILL, LEN, MAX);       \
 147   if ((N) > 1 && (subseg_text_p (now_seg)       \
 148       || strncmp (now_seg->name, ".gcc_except_table", sizeof(".gcc_except_table") - 1) == 0)) \
 149     nds32_do_align (N);                         \
 150   goto LABEL;
 151 #define md_elf_section_change_hook()            nds32_elf_section_change_hook ()
 152 #define md_flush_pending_output()               nds32_flush_pending_output ()
 153 #define md_cleanup()                            nds32_cleanup ()
 154 #define LOCAL_LABELS_FB                         1 /* Permit temporary numeric labels.  */
 155
 156 /* frags.c.  */
 157 struct nds32_frag_type
 158 {
 159   relax_substateT flag;
 160   struct nds32_opcode *opcode;
 161   uint32_t insn;
 162   /* To Save previos label fixup if existence.  */
 163   struct fix *fixup;
 164 };
 165
 166 extern void nds32_frag_init (fragS *);
 167
 168 #define TC_FRAG_TYPE                            struct nds32_frag_type
 169 #define TC_FRAG_INIT(fragP)                     nds32_frag_init (fragP)
 170
 171 /* CFI directive.  */
 172 extern void nds32_elf_frame_initial_instructions (void);
 173 extern int tc_nds32_regname_to_dw2regnum (char *);
 174
 175 #define TARGET_USE_CFIPOP                       1
 176 #define DWARF2_DEFAULT_RETURN_COLUMN            30
 177 #define DWARF2_CIE_DATA_ALIGNMENT               -4
 178 #define DWARF2_LINE_MIN_INSN_LENGTH             2
 179
 180 #define tc_regname_to_dw2regnum                 tc_nds32_regname_to_dw2regnum
 181 #define tc_cfi_frame_initial_instructions       tc_nds32_frame_initial_instructions
 182
 183 /* COLE: TODO: Review These. They seem to be obsoleted.  */
 184 #if 1
 185 #define TC_RELOC_RTSYM_LOC_FIXUP(FIX)                           \
 186    ((FIX)->fx_addsy == NULL                                     \
 187     || (! S_IS_EXTERNAL ((FIX)->fx_addsy)                       \
 188         && ! S_IS_WEAK ((FIX)->fx_addsy)                        \
 189         && S_IS_DEFINED ((FIX)->fx_addsy)                       \
 190         && ! S_IS_COMMON ((FIX)->fx_addsy)))
 191 #define TC_HANDLES_FX_DONE
 192 /* This arranges for gas/write.c to not apply a relocation if
 193    obj_fix_adjustable() says it is not adjustable.  */
 194 #define TC_FIX_ADJUSTABLE(fixP) obj_fix_adjustable (fixP)
 195 #endif
 196
 197 /* Because linker may relax the code, assemble-time expression
 198    optimization is not allowed.  */
 199 #define md_allow_eh_opt 0
 200
 201 /* For nds32 relax.  */
 202 enum nds32_br_range
 203 {
 204   BR_RANGE_S256 = 0,
 205   BR_RANGE_S16K,
 206   BR_RANGE_S64K,
 207   BR_RANGE_S16M,
 208   BR_RANGE_U4G,
 209   BR_RANGE_NUM
 210 };
 211
 212 enum nds32_ramp
 213 {
 214   NDS32_CREATE_LABLE = 1,
 215   NDS32_RELAX = 2,
 216   NDS32_ORIGIN = 4,
 217   NDS32_CONVERT = 8
 218 };
 219
 220 typedef struct nds32_relax_fixup_info
 221 {
 222   int offset;
 223   int size;
 224   /* Reverse branch has to jump to the end of instruction pattern.  */
 225   int ramp;
 226   enum bfd_reloc_code_real r_type;
 227 } nds32_relax_fixup_info_t;
 228
 229 typedef struct nds32_cond_field
 230 {
 231   int offset;
 232   int bitpos; /* Register position.  */
 233   int bitmask; /* Number of register bits.  */
 234 } nds32_cond_field_t;
 235
 236 /* The max relaxation pattern is 20-bytes including the nop.  */
 237 #define NDS32_MAXCHAR 20
 238 /* In current, the max entend number of instruction for one pseudo instruction
 239    is 4, but its number of relocation may be 5.  */
 240 #define MAX_RELAX_NUM 8
 241
 242 typedef struct nds32_relax_info
 243 {
 244   /* Opcode for the instruction.  */
 245   const char *opcode;
 246   enum nds32_br_range br_range;
 247   nds32_cond_field_t cond_field[MAX_RELAX_NUM]; /* TODO: Reuse nds32_field?  */
 248   /* Code sequences for different branch range.  */
 249   uint32_t relax_code_seq[BR_RANGE_NUM][MAX_RELAX_NUM];
 250   nds32_cond_field_t relax_code_condition[BR_RANGE_NUM][MAX_RELAX_NUM];
 251   int relax_code_size[BR_RANGE_NUM];
 252   int relax_branch_isize[BR_RANGE_NUM];
 253   nds32_relax_fixup_info_t relax_fixup[BR_RANGE_NUM][MAX_RELAX_NUM];
 254 } relax_info_t;
 255
 256 /* Relocation table.  */
 257 struct nds32_relocation_map
 258 {
 259   unsigned int main_type;
 260   /* Number of instructions, {relocations type, instruction type}.  */
 261   unsigned int reloc_insn[6][6][3];
 262 };
 263
 264 #endif /* TC_NDS32 */