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 #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
 167 /* We use this hook to check the validity of the last to instructions
 168    of a ZOL.  */
 169 #define tc_frob_label(S)  arc_frob_label (S)
 170
 171 #define GLOBAL_OFFSET_TABLE_NAME "_GLOBAL_OFFSET_TABLE_"
 172 #define DYNAMIC_STRUCT_NAME "_DYNAMIC"
 173
 174 /* We need to take care of not having section relative fixups for the
 175    fixups with respect to Position Independent Code.  */
 176 #define tc_fix_adjustable(FIX)  tc_arc_fix_adjustable(FIX)
 177
 178 /* This hook is required to parse register names as operands.  */
 179 #define md_parse_name(name, exp, m, c) arc_parse_name (name, exp)
 180
 181 /* Used within frags to pass some information to some relaxation
 182    machine dependent values.  */
 183 #define TC_FRAG_TYPE struct arc_relax_type
 184
 185 /* Adjust non PC-rel values at relaxation time.  */
 186 #define TC_PCREL_ADJUST(F) arc_pcrel_adjust (F)
 187
 188 extern int arc_pcrel_adjust (fragS *);
 189 extern bfd_boolean arc_parse_name (const char *, struct expressionS *);
 190 extern int tc_arc_fix_adjustable (struct fix *);
 191 extern void arc_handle_align (fragS *);
 192 extern void arc_cons_fix_new (fragS *, int, int, expressionS *,
 193                               bfd_reloc_code_real_type);
 194 extern void arc_frob_label (symbolS *);
 195 extern void tc_arc_frame_initial_instructions (void);
 196 extern int tc_arc_regname_to_dw2regnum (char *regname);
 197
 198 /* The blink register is r31.  */
 199 #define DWARF2_DEFAULT_RETURN_COLUMN    31
 200 /* Registers are generally saved at negative offsets to the CFA.  */
 201 #define DWARF2_CIE_DATA_ALIGNMENT       (-4)
 202
 203 /* We want .cfi_* pseudo-ops for generating unwind info.  */
 204 #define TARGET_USE_CFIPOP 1
 205
 206 /* CFI hooks.  */
 207 #define tc_cfi_frame_initial_instructions  tc_arc_frame_initial_instructions
 208 #define tc_regname_to_dw2regnum tc_arc_regname_to_dw2regnum
 209
 210 /* Define the NOPs.  */
 211 #define NOP_OPCODE_S   0x000078E0
 212 #define NOP_OPCODE_L   0x264A7000 /* mov 0,0.  */
 213
 214 #define MAX_FLAG_NAME_LENGTH 3
 215
 216 struct arc_flags
 217 {
 218   /* Name of the parsed flag.  */
 219   char name[MAX_FLAG_NAME_LENGTH + 1];
 220
 221   /* The code of the parsed flag.  Valid when is not zero.  */
 222   unsigned char code;
 223 };
 224
 225 extern const relax_typeS md_relax_table[];
 226 #define TC_GENERIC_RELAX_TABLE md_relax_table
 227
 228 /* Used to construct instructions at md_convert_frag stage of
 229    relaxation.  */
 230 struct arc_relax_type
 231 {
 232   /* Dictates whether the pc-relativity should be kept in mind when
 233      relax_frag is called or whether the pc-relativity should be
 234      solved outside of relaxation.  For clarification: BL(_S) and
 235      B(_S) use pcrel == 1 and ADD with a solvable expression as 3rd
 236      operand use pcrel == 0.  */
 237   unsigned char pcrel;
 238
 239   /* Expressions that dictate the operands.  Used for re-assembling in
 240      md_convert_frag.  */
 241   expressionS tok[MAX_INSN_ARGS];
 242
 243   /* Number of tok (i.e. number of operands).  Used for re-assembling
 244      in md_convert_frag.  */
 245   int ntok;
 246
 247   /* Flags of instruction.  Used for re-assembling in
 248      md_convert_frag.  */
 249   struct arc_flags pflags[MAX_INSN_FLGS];
 250
 251   /* Number of flags.  Used for re-assembling in md_convert_frag.  */
 252   int nflg;
 253 };