gas/config/tc-arc.h

   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
  24 /* By convention, you should define this macro in the `.h' file.  For
  25    example, `tc-m68k.h' defines `TC_M68K'.  You might have to use this
  26    if it is necessary to add CPU specific code to the object format
  27    file.  */
  28 #define TC_ARC
  29
  30 /* We want local label support.  */
  31 #define LOCAL_LABELS_FB 1
  32
  33 /* This macro is the BFD architecture to pass to
  34    `bfd_set_arch_mach'.  */
  35 #define TARGET_ARCH bfd_arch_arc
  36
  37 /* The `extsym - .' expressions can be emitted using PC-relative
  38    relocs.  */
  39 #define DIFF_EXPR_OK
  40
  41 #define REGISTER_PREFIX '%'
  42
  43 #undef  LITTLE_ENDIAN
  44 #define LITTLE_ENDIAN   1234
  45
  46 #undef  BIG_ENDIAN
  47 #define BIG_ENDIAN      4321
  48
  49 #ifdef TARGET_BYTES_BIG_ENDIAN
  50
  51 # define DEFAULT_TARGET_FORMAT  "elf32-bigarc"
  52 # define DEFAULT_BYTE_ORDER     BIG_ENDIAN
  53
  54 #else
  55 /* You should define this macro to be non-zero if the target is big
  56    endian, and zero if the target is little endian.  */
  57 # define TARGET_BYTES_BIG_ENDIAN 0
  58
  59 # define DEFAULT_TARGET_FORMAT  "elf32-littlearc"
  60 # define DEFAULT_BYTE_ORDER     LITTLE_ENDIAN
  61
  62 #endif /* TARGET_BYTES_BIG_ENDIAN.  */
  63
  64 /* The endianness of the target format may change based on command
  65    line arguments.  */
  66 extern const char *arc_target_format;
  67
  68 /* This macro is the BFD target name to use when creating the output
  69    file.  This will normally depend upon the `OBJ_FMT' macro.  */
  70 #define TARGET_FORMAT arc_target_format
  71
  72 /* `md_short_jump_size'
  73    `md_long_jump_size'
  74    `md_create_short_jump'
  75    `md_create_long_jump'
  76
  77    If `WORKING_DOT_WORD' is defined, GAS will not do broken word
  78    processing (*note Broken words::.).  Otherwise, you should set
  79    `md_short_jump_size' to the size of a short jump (a jump that is
  80    just long enough to jump around a long jmp) and `md_long_jump_size'
  81    to the size of a long jump (a jump that can go anywhere in the
  82    function).  You should define `md_create_short_jump' to create a
  83    short jump around a long jump, and define `md_create_long_jump' to
  84    create a long jump.  */
  85 #define WORKING_DOT_WORD
  86
  87 #define LISTING_HEADER "ARC GAS "
  88
  89 /* The number of bytes to put into a word in a listing.  This affects
  90    the way the bytes are clumped together in the listing.  For
  91    example, a value of 2 might print `1234 5678' where a value of 1
  92    would print `12 34 56 78'.  The default value is 4.  */
  93 #define LISTING_WORD_SIZE 2
  94
  95 /* If you define this macro, it should return the position from which
  96    the PC relative adjustment for a PC relative fixup should be made.
  97    On many processors, the base of a PC relative instruction is the
  98    next instruction, so this macro would return the length of an
  99    instruction, plus the address of the PC relative fixup.  The latter
 100    can be calculated as fixp->fx_where +
 101    fixp->fx_frag->fr_address.  */
 102 extern long md_pcrel_from_section (struct fix *, segT);
 103 #define MD_PCREL_FROM_SECTION(FIX, SEC) md_pcrel_from_section (FIX, SEC)
 104
 105 /* [ ] is index operator.  */
 106 #define NEED_INDEX_OPERATOR
 107
 108 #define MAX_MEM_FOR_RS_ALIGN_CODE (1+2)
 109
 110 /* HANDLE_ALIGN called after all the assembly has been done,
 111    so we can fill in all the rs_align_code type frags with
 112    nop instructions.  */
 113 #define HANDLE_ALIGN(FRAGP)      arc_handle_align (FRAGP)
 114
 115 /* Values passed to md_apply_fix3 don't include the symbol value.  */
 116 #define MD_APPLY_SYM_VALUE(FIX) 0
 117
 118 /* No shared lib support, so we don't need to ensure externally
 119    visible symbols can be overridden.  */
 120 #define EXTERN_FORCE_RELOC 0
 121
 122 /* You may define this macro to generate a fixup for a data allocation
 123    pseudo-op.  */
 124 #define TC_CONS_FIX_NEW(FRAG, OFF, LEN, EXP, RELOC)     \
 125   arc_cons_fix_new ((FRAG), (OFF), (LEN), (EXP), (RELOC))
 126
 127 /* We don't want gas to fixup the following program memory related
 128    relocations.  Check also that fx_addsy is not NULL, in order to
 129    make sure that the fixup refers to some sort of label.  */
 130 #define TC_VALIDATE_FIX(FIXP,SEG,SKIP)                               \
 131   if ((FIXP->fx_r_type == BFD_RELOC_ARC_GOTPC32                      \
 132        || FIXP->fx_r_type == BFD_RELOC_ARC_PLT32                     \
 133        || FIXP->fx_r_type == BFD_RELOC_ARC_S25W_PCREL_PLT            \
 134        || FIXP->fx_r_type == BFD_RELOC_ARC_S25H_PCREL_PLT            \
 135        || FIXP->fx_r_type == BFD_RELOC_ARC_S21W_PCREL_PLT            \
 136        || FIXP->fx_r_type == BFD_RELOC_ARC_S21H_PCREL_PLT)           \
 137       && FIXP->fx_addsy != NULL                                      \
 138       && FIXP->fx_subsy == NULL)                                     \
 139     {                                                                \
 140       symbol_mark_used_in_reloc (FIXP->fx_addsy);                    \
 141       goto SKIP;                                                     \
 142     }
 143
 144 /* BFD_RELOC_ARC_TLS_GD_LD may use fx_subsy to store a label that is
 145    later turned into fx_offset.  */
 146 #define TC_FORCE_RELOCATION_SUB_LOCAL(FIX, SEG) \
 147   ((FIX)->fx_r_type == BFD_RELOC_ARC_TLS_GD_LD)
 148
 149 #define TC_VALIDATE_FIX_SUB(FIX, SEG) \
 150   ((md_register_arithmetic || (SEG) != reg_section) \
 151    && ((FIX)->fx_r_type == BFD_RELOC_GPREL32 \
 152        || (FIX)->fx_r_type == BFD_RELOC_GPREL16 \
 153        || (FIX)->fx_r_type == BFD_RELOC_ARC_TLS_DTPOFF \
 154        || (FIX)->fx_r_type == BFD_RELOC_ARC_TLS_DTPOFF_S9 \
 155        || TC_FORCE_RELOCATION_SUB_LOCAL (FIX, SEG)))
 156
 157 /* We use this to mark the end-loop label.  We use this mark for ZOL
 158    validity checks.  */
 159 #define TC_SYMFIELD_TYPE   unsigned int
 160 #define ARC_GET_FLAG(s)   (*symbol_get_tc (s))
 161 #define ARC_SET_FLAG(s,v) (*symbol_get_tc (s) |= (v))
 162
 163 /* The symbol is a ZOL's end loop label.  */
 164 #define ARC_FLAG_ZOL      (1 << 0)
 165
 166 /* We use this hook to check the validity of the last to instructions
 167    of a ZOL.  */
 168 #define tc_frob_label(S)  arc_frob_label (S)
 169
 170 #define GLOBAL_OFFSET_TABLE_NAME "_GLOBAL_OFFSET_TABLE_"
 171 #define DYNAMIC_STRUCT_NAME "_DYNAMIC"
 172
 173 /* We need to take care of not having section relative fixups for the
 174    fixups with respect to Position Independent Code.  */
 175 #define tc_fix_adjustable(FIX)  tc_arc_fix_adjustable(FIX)
 176
 177 /* This hook is required to parse register names as operands.  */
 178 #define md_parse_name(name, exp, m, c) arc_parse_name (name, exp)
 179
 180 /* Used within frags to pass some information to some relaxation
 181    machine dependent values.  */
 182 #define TC_FRAG_TYPE struct arc_relax_type
 183
 184 /* Adjust non PC-rel values at relaxation time.  */
 185 #define TC_PCREL_ADJUST(F) arc_pcrel_adjust (F)
 186
 187 extern int arc_pcrel_adjust (fragS *);
 188 extern bfd_boolean arc_parse_name (const char *, struct expressionS *);
 189 extern int tc_arc_fix_adjustable (struct fix *);
 190 extern void arc_handle_align (fragS *);
 191 extern void arc_cons_fix_new (fragS *, int, int, expressionS *,
 192                               bfd_reloc_code_real_type);
 193 extern void arc_frob_label (symbolS *);
 194
 195 /* The blink register is r31.  */
 196 #define DWARF2_DEFAULT_RETURN_COLUMN    31
 197 /* Registers are generally saved at negative offsets to the CFA.  */
 198 #define DWARF2_CIE_DATA_ALIGNMENT       (-4)
 199
 200 /* Define the NOPs.  */
 201 #define NOP_OPCODE_S   0x000078E0
 202 #define NOP_OPCODE_L   0x264A7000 /* mov 0,0.  */
 203
 204 #define MAX_FLAG_NAME_LENGHT 3
 205
 206 struct arc_flags
 207 {
 208   /* Name of the parsed flag.  */
 209   char name[MAX_FLAG_NAME_LENGHT + 1];
 210
 211   /* The code of the parsed flag.  Valid when is not zero.  */
 212   unsigned char code;
 213 };
 214
 215 #ifndef MAX_INSN_ARGS
 216 #define MAX_INSN_ARGS        6
 217 #endif
 218
 219 #ifndef MAX_INSN_FLGS
 220 #define MAX_INSN_FLGS        3
 221 #endif
 222
 223 extern const relax_typeS md_relax_table[];
 224 #define TC_GENERIC_RELAX_TABLE md_relax_table
 225
 226 /* Used to construct instructions at md_convert_frag stage of
 227    relaxation.  */
 228 struct arc_relax_type
 229 {
 230   /* Dictates whether the pc-relativity should be kept in mind when
 231      relax_frag is called or whether the pc-relativity should be
 232      solved outside of relaxation.  For clarification: BL(_S) and
 233      B(_S) use pcrel == 1 and ADD with a solvable expression as 3rd
 234      operand use pcrel == 0.  */
 235   unsigned char pcrel;
 236
 237   /* Expressions that dictate the operands.  Used for re-assembling in
 238      md_convert_frag.  */
 239   expressionS tok[MAX_INSN_ARGS];
 240
 241   /* Number of tok (i.e. number of operands).  Used for re-assembling
 242      in md_convert_frag.  */
 243   int ntok;
 244
 245   /* Flags of instruction.  Used for re-assembling in
 246      md_convert_frag.  */
 247   struct arc_flags pflags[MAX_INSN_FLGS];
 248
 249   /* Number of flags.  Used for re-assembling in md_convert_frag.  */
 250   int nflg;
 251 };