gas/config/tc-i386.h

   1 /* tc-i386.h -- Header file for tc-i386.c
   2    Copyright (C) 1989, 92, 93, 94, 95, 96, 97, 98, 99, 2000, 2001
   3    Free Software Foundation.
   4
   5    This file is part of GAS, the GNU Assembler.
   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 2, 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, 59 Temple Place - Suite 330, Boston, MA
  20    02111-1307, USA.  */
  21
  22 #ifndef TC_I386
  23 #define TC_I386 1
  24
  25 #ifdef ANSI_PROTOTYPES
  26 struct fix;
  27 #endif
  28
  29 #define TARGET_BYTES_BIG_ENDIAN 0
  30
  31 #ifdef TE_LYNX
  32 #define TARGET_FORMAT           "coff-i386-lynx"
  33 #endif
  34
  35 #ifdef BFD_ASSEMBLER
  36 /* This is used to determine relocation types in tc-i386.c.  The first
  37    parameter is the current relocation type, the second one is the desired
  38    type.  The idea is that if the original type is already some kind of PIC
  39    relocation, we leave it alone, otherwise we give it the desired type */
  40
  41 #define tc_fix_adjustable(X)  tc_i386_fix_adjustable(X)
  42 extern int tc_i386_fix_adjustable PARAMS ((struct fix *));
  43
  44 #if (defined (OBJ_MAYBE_ELF) || defined (OBJ_ELF) || defined (OBJ_MAYBE_COFF) || defined (OBJ_COFF)) && !defined (TE_PE)
  45 /* This arranges for gas/write.c to not apply a relocation if
  46    tc_fix_adjustable() says it is not adjustable.
  47    The "! symbol_used_in_reloc_p" test is there specifically to cover
  48    the case of non-global symbols in linkonce sections.  It's the
  49    generally correct thing to do though;  If a reloc is going to be
  50    emitted against a symbol then we don't want to adjust the fixup by
  51    applying the reloc during assembly.  The reloc will be applied by
  52    the linker during final link.  */
  53 #define TC_FIX_ADJUSTABLE(fixP) \
  54   (! symbol_used_in_reloc_p ((fixP)->fx_addsy) && tc_fix_adjustable (fixP))
  55 #endif
  56
  57 /* This expression evaluates to false if the relocation is for a local object
  58    for which we still want to do the relocation at runtime.  True if we
  59    are willing to perform this relocation while building the .o file.
  60    This is only used for pcrel relocations, so GOTOFF does not need to be
  61    checked here.  I am not sure if some of the others are ever used with
  62    pcrel, but it is easier to be safe than sorry.  */
  63
  64 #define TC_RELOC_RTSYM_LOC_FIXUP(FIX)                           \
  65   ((FIX)->fx_r_type != BFD_RELOC_386_PLT32                      \
  66    && (FIX)->fx_r_type != BFD_RELOC_386_GOT32                   \
  67    && (FIX)->fx_r_type != BFD_RELOC_386_GOTPC                   \
  68    && ((FIX)->fx_addsy == NULL                                  \
  69        || (! S_IS_EXTERNAL ((FIX)->fx_addsy)                    \
  70            && ! S_IS_WEAK ((FIX)->fx_addsy)                     \
  71            && S_IS_DEFINED ((FIX)->fx_addsy)                    \
  72            && ! S_IS_COMMON ((FIX)->fx_addsy))))
  73
  74 #define TARGET_ARCH             bfd_arch_i386
  75
  76 #ifdef TE_NetBSD
  77 #define AOUT_TARGET_FORMAT      "a.out-i386-netbsd"
  78 #endif
  79 #ifdef TE_386BSD
  80 #define AOUT_TARGET_FORMAT      "a.out-i386-bsd"
  81 #endif
  82 #ifdef TE_LINUX
  83 #define AOUT_TARGET_FORMAT      "a.out-i386-linux"
  84 #endif
  85 #ifdef TE_Mach
  86 #define AOUT_TARGET_FORMAT      "a.out-mach3"
  87 #endif
  88 #ifdef TE_DYNIX
  89 #define AOUT_TARGET_FORMAT      "a.out-i386-dynix"
  90 #endif
  91 #ifndef AOUT_TARGET_FORMAT
  92 #define AOUT_TARGET_FORMAT      "a.out-i386"
  93 #endif
  94
  95 #if ((defined (OBJ_MAYBE_COFF) && defined (OBJ_MAYBE_AOUT)) \
  96      || defined (OBJ_ELF) || defined (OBJ_MAYBE_ELF))
  97 extern const char *i386_target_format PARAMS ((void));
  98 #define TARGET_FORMAT i386_target_format ()
  99 #else
 100 #ifdef OBJ_ELF
 101 #define TARGET_FORMAT           "elf32-i386"
 102 #endif
 103 #ifdef OBJ_AOUT
 104 #define TARGET_FORMAT           AOUT_TARGET_FORMAT
 105 #endif
 106 #endif
 107
 108 #else /* ! BFD_ASSEMBLER */
 109
 110 /* COFF STUFF */
 111
 112 #define COFF_MAGIC I386MAGIC
 113 #define BFD_ARCH bfd_arch_i386
 114 #define COFF_FLAGS F_AR32WR
 115 #define TC_COUNT_RELOC(x) ((x)->fx_addsy || (x)->fx_r_type==7)
 116 #define TC_COFF_FIX2RTYPE(fixP) tc_coff_fix2rtype(fixP)
 117 extern short tc_coff_fix2rtype PARAMS ((struct fix *));
 118 #define TC_COFF_SIZEMACHDEP(frag) tc_coff_sizemachdep(frag)
 119 extern int tc_coff_sizemachdep PARAMS ((fragS *frag));
 120
 121 #ifdef TE_GO32
 122 /* DJGPP now expects some sections to be 2**4 aligned.  */
 123 #define SUB_SEGMENT_ALIGN(SEG)                                          \
 124   ((strcmp (obj_segment_name (SEG), ".text") == 0                       \
 125     || strcmp (obj_segment_name (SEG), ".data") == 0                    \
 126     || strcmp (obj_segment_name (SEG), ".bss") == 0                     \
 127     || strncmp (obj_segment_name (SEG), ".gnu.linkonce.t", 15) == 0     \
 128     || strncmp (obj_segment_name (SEG), ".gnu.linkonce.d", 15) == 0     \
 129     || strncmp (obj_segment_name (SEG), ".gnu.linkonce.r", 15) == 0)    \
 130    ? 4                                                                  \
 131    : 2)
 132 #else
 133 #define SUB_SEGMENT_ALIGN(SEG) 2
 134 #endif
 135
 136 #define TC_RVA_RELOC 7
 137 /* Need this for PIC relocations */
 138 #define NEED_FX_R_TYPE
 139
 140 #ifdef TE_386BSD
 141 /* The BSDI linker apparently rejects objects with a machine type of
 142    M_386 (100).  */
 143 #define AOUT_MACHTYPE 0
 144 #else
 145 #define AOUT_MACHTYPE 100
 146 #endif
 147
 148 #undef REVERSE_SORT_RELOCS
 149
 150 #endif /* ! BFD_ASSEMBLER */
 151
 152 #define TC_FORCE_RELOCATION(fixp) tc_i386_force_relocation(fixp)
 153 extern int tc_i386_force_relocation PARAMS ((struct fix *));
 154
 155 #ifdef BFD_ASSEMBLER
 156 #define NO_RELOC BFD_RELOC_NONE
 157 #else
 158 #define NO_RELOC 0
 159 #endif
 160 #define tc_coff_symbol_emit_hook(a)     ;       /* not used */
 161
 162 #ifndef BFD_ASSEMBLER
 163 #ifndef OBJ_AOUT
 164 #ifndef TE_PE
 165 #ifndef TE_GO32
 166 /* Local labels starts with .L */
 167 #define LOCAL_LABEL(name) (name[0] == '.' \
 168                  && (name[1] == 'L' || name[1] == 'X' || name[1] == '.'))
 169 #endif
 170 #endif
 171 #endif
 172 #endif
 173
 174 #define LOCAL_LABELS_FB 1
 175
 176 #define tc_aout_pre_write_hook(x)       {;}     /* not used */
 177 #define tc_crawl_symbol_chain(a)        {;}     /* not used */
 178 #define tc_headers_hook(a)              {;}     /* not used */
 179
 180 extern const char extra_symbol_chars[];
 181 #define tc_symbol_chars extra_symbol_chars
 182
 183 #define MAX_OPERANDS 3          /* max operands per insn */
 184 #define MAX_IMMEDIATE_OPERANDS 2/* max immediates per insn (lcall, ljmp) */
 185 #define MAX_MEMORY_OPERANDS 2   /* max memory refs per insn (string ops) */
 186
 187 /* Prefixes will be emitted in the order defined below.
 188    WAIT_PREFIX must be the first prefix since FWAIT is really is an
 189    instruction, and so must come before any prefixes.  */
 190 #define WAIT_PREFIX     0
 191 #define LOCKREP_PREFIX  1
 192 #define ADDR_PREFIX     2
 193 #define DATA_PREFIX     3
 194 #define SEG_PREFIX      4
 195 #define REX_PREFIX      5       /* must come last.  */
 196 #define MAX_PREFIXES    6       /* max prefixes per opcode */
 197
 198 /* we define the syntax here (modulo base,index,scale syntax) */
 199 #define REGISTER_PREFIX '%'
 200 #define IMMEDIATE_PREFIX '$'
 201 #define ABSOLUTE_PREFIX '*'
 202
 203 #define TWO_BYTE_OPCODE_ESCAPE 0x0f
 204 #define NOP_OPCODE (char) 0x90
 205
 206 /* register numbers */
 207 #define EBP_REG_NUM 5
 208 #define ESP_REG_NUM 4
 209
 210 /* modrm_byte.regmem for twobyte escape */
 211 #define ESCAPE_TO_TWO_BYTE_ADDRESSING ESP_REG_NUM
 212 /* index_base_byte.index for no index register addressing */
 213 #define NO_INDEX_REGISTER ESP_REG_NUM
 214 /* index_base_byte.base for no base register addressing */
 215 #define NO_BASE_REGISTER EBP_REG_NUM
 216 #define NO_BASE_REGISTER_16 6
 217
 218 /* these are the instruction mnemonic suffixes.  */
 219 #define WORD_MNEM_SUFFIX  'w'
 220 #define BYTE_MNEM_SUFFIX  'b'
 221 #define SHORT_MNEM_SUFFIX 's'
 222 #define LONG_MNEM_SUFFIX  'l'
 223 #define QWORD_MNEM_SUFFIX  'q'
 224 /* Intel Syntax */
 225 #define LONG_DOUBLE_MNEM_SUFFIX 'x'
 226
 227 /* modrm.mode = REGMEM_FIELD_HAS_REG when a register is in there */
 228 #define REGMEM_FIELD_HAS_REG 0x3/* always = 0x3 */
 229 #define REGMEM_FIELD_HAS_MEM (~REGMEM_FIELD_HAS_REG)
 230
 231 #define END_OF_INSN '\0'
 232
 233 /* Intel Syntax */
 234 /* Values 0-4 map onto scale factor */
 235 #define BYTE_PTR     0
 236 #define WORD_PTR     1
 237 #define DWORD_PTR    2
 238 #define QWORD_PTR    3
 239 #define XWORD_PTR    4
 240 #define SHORT        5
 241 #define OFFSET_FLAT  6
 242 #define FLAT         7
 243 #define NONE_FOUND   8
 244
 245 typedef struct
 246 {
 247   /* instruction name sans width suffix ("mov" for movl insns) */
 248   char *name;
 249
 250   /* how many operands */
 251   unsigned int operands;
 252
 253   /* base_opcode is the fundamental opcode byte without optional
 254      prefix(es).  */
 255   unsigned int base_opcode;
 256
 257   /* extension_opcode is the 3 bit extension for group <n> insns.
 258      This field is also used to store the 8-bit opcode suffix for the
 259      AMD 3DNow! instructions.
 260      If this template has no extension opcode (the usual case) use None */
 261   unsigned int extension_opcode;
 262 #define None 0xffff             /* If no extension_opcode is possible.  */
 263
 264   /* cpu feature flags */
 265   unsigned int cpu_flags;
 266 #define Cpu086            0x1   /* Any old cpu will do, 0 does the same */
 267 #define Cpu186            0x2   /* i186 or better required */
 268 #define Cpu286            0x4   /* i286 or better required */
 269 #define Cpu386            0x8   /* i386 or better required */
 270 #define Cpu486           0x10   /* i486 or better required */
 271 #define Cpu586           0x20   /* i585 or better required */
 272 #define Cpu686           0x40   /* i686 or better required */
 273 #define CpuP4            0x80   /* Pentium4 or better required */
 274 #define CpuK6           0x100   /* AMD K6 or better required*/
 275 #define CpuAthlon       0x200   /* AMD Athlon or better required*/
 276 #define CpuSledgehammer 0x400   /* Sledgehammer or better required */
 277 #define CpuMMX          0x800   /* MMX support required */
 278 #define CpuSSE         0x1000   /* Streaming SIMD extensions required */
 279 #define CpuSSE2        0x2000   /* Streaming SIMD extensions 2 required */
 280 #define Cpu3dnow       0x4000   /* 3dnow! support required */
 281 #define CpuUnknown     0x8000   /* The CPU is unknown,  be on the safe side.  */
 282
 283   /* These flags are set by gas depending on the flag_code.  */
 284 #define Cpu64        0x4000000   /* 64bit support required  */
 285 #define CpuNo64      0x8000000   /* Not supported in the 64bit mode  */
 286
 287   /* The default value for unknown CPUs - enable all features to avoid problems.  */
 288 #define CpuUnknownFlags (Cpu086|Cpu186|Cpu286|Cpu386|Cpu486|Cpu586|Cpu686|CpuP4|CpuSledgehammer|CpuMMX|CpuSSE|CpuSSE2|Cpu3dnow|CpuK6|CpuAthlon)
 289
 290   /* the bits in opcode_modifier are used to generate the final opcode from
 291      the base_opcode.  These bits also are used to detect alternate forms of
 292      the same instruction */
 293   unsigned int opcode_modifier;
 294
 295   /* opcode_modifier bits: */
 296 #define W                  0x1  /* set if operands can be words or dwords
 297                                    encoded the canonical way */
 298 #define D                  0x2  /* D = 0 if Reg --> Regmem;
 299                                    D = 1 if Regmem --> Reg:    MUST BE 0x2 */
 300 #define Modrm              0x4
 301 #define FloatR             0x8  /* src/dest swap for floats:   MUST BE 0x8 */
 302 #define ShortForm         0x10  /* register is in low 3 bits of opcode */
 303 #define FloatMF           0x20  /* FP insn memory format bit, sized by 0x4 */
 304 #define Jump              0x40  /* special case for jump insns.  */
 305 #define JumpDword         0x80  /* call and jump */
 306 #define JumpByte         0x100  /* loop and jecxz */
 307 #define JumpInterSegment 0x200  /* special case for intersegment leaps/calls */
 308 #define FloatD           0x400  /* direction for float insns:  MUST BE 0x400 */
 309 #define Seg2ShortForm    0x800  /* encoding of load segment reg insns */
 310 #define Seg3ShortForm   0x1000  /* fs/gs segment register insns.  */
 311 #define Size16          0x2000  /* needs size prefix if in 32-bit mode */
 312 #define Size32          0x4000  /* needs size prefix if in 16-bit mode */
 313 #define Size64          0x8000  /* needs size prefix if in 16-bit mode */
 314 #define IgnoreSize     0x10000  /* instruction ignores operand size prefix */
 315 #define DefaultSize    0x20000  /* default insn size depends on mode */
 316 #define No_bSuf        0x40000  /* b suffix on instruction illegal */
 317 #define No_wSuf        0x80000  /* w suffix on instruction illegal */
 318 #define No_lSuf       0x100000  /* l suffix on instruction illegal */
 319 #define No_sSuf       0x200000  /* s suffix on instruction illegal */
 320 #define No_qSuf       0x400000  /* q suffix on instruction illegal */
 321 #define No_xSuf       0x800000  /* x suffix on instruction illegal */
 322 #define FWait        0x1000000  /* instruction needs FWAIT */
 323 #define IsString     0x2000000  /* quick test for string instructions */
 324 #define regKludge    0x4000000  /* fake an extra reg operand for clr, imul */
 325 #define IsPrefix     0x8000000  /* opcode is a prefix */
 326 #define ImmExt      0x10000000  /* instruction has extension in 8 bit imm */
 327 #define NoRex64     0x20000000  /* instruction don't need Rex64 prefix.  */
 328 #define Rex64       0x40000000  /* instruction require Rex64 prefix.  */
 329 #define Ugh         0x80000000  /* deprecated fp insn, gets a warning */
 330
 331   /* operand_types[i] describes the type of operand i.  This is made
 332      by OR'ing together all of the possible type masks.  (e.g.
 333      'operand_types[i] = Reg|Imm' specifies that operand i can be
 334      either a register or an immediate operand.  */
 335   unsigned int operand_types[3];
 336
 337   /* operand_types[i] bits */
 338   /* register */
 339 #define Reg8               0x1  /* 8 bit reg */
 340 #define Reg16              0x2  /* 16 bit reg */
 341 #define Reg32              0x4  /* 32 bit reg */
 342 #define Reg64              0x8  /* 64 bit reg */
 343   /* immediate */
 344 #define Imm8              0x10  /* 8 bit immediate */
 345 #define Imm8S             0x20  /* 8 bit immediate sign extended */
 346 #define Imm16             0x40  /* 16 bit immediate */
 347 #define Imm32             0x80  /* 32 bit immediate */
 348 #define Imm32S           0x100  /* 32 bit immediate sign extended */
 349 #define Imm64            0x200  /* 64 bit immediate */
 350 #define Imm1             0x400  /* 1 bit immediate */
 351   /* memory */
 352 #define BaseIndex        0x800
 353   /* Disp8,16,32 are used in different ways, depending on the
 354      instruction.  For jumps, they specify the size of the PC relative
 355      displacement, for baseindex type instructions, they specify the
 356      size of the offset relative to the base register, and for memory
 357      offset instructions such as `mov 1234,%al' they specify the size of
 358      the offset relative to the segment base.  */
 359 #define Disp8           0x1000  /* 8 bit displacement */
 360 #define Disp16          0x2000  /* 16 bit displacement */
 361 #define Disp32          0x4000  /* 32 bit displacement */
 362 #define Disp32S         0x8000  /* 32 bit signed displacement */
 363 #define Disp64         0x10000  /* 64 bit displacement */
 364   /* specials */
 365 #define InOutPortReg   0x20000  /* register to hold in/out port addr = dx */
 366 #define ShiftCount     0x40000  /* register to hold shift cound = cl */
 367 #define Control        0x80000  /* Control register */
 368 #define Debug         0x100000  /* Debug register */
 369 #define Test          0x200000  /* Test register */
 370 #define FloatReg      0x400000  /* Float register */
 371 #define FloatAcc      0x800000  /* Float stack top %st(0) */
 372 #define SReg2        0x1000000  /* 2 bit segment register */
 373 #define SReg3        0x2000000  /* 3 bit segment register */
 374 #define Acc          0x4000000  /* Accumulator %al or %ax or %eax */
 375 #define JumpAbsolute 0x8000000
 376 #define RegMMX      0x10000000  /* MMX register */
 377 #define RegXMM      0x20000000  /* XMM registers in PIII */
 378 #define EsSeg       0x40000000  /* String insn operand with fixed es segment */
 379
 380   /* InvMem is for instructions with a modrm byte that only allow a
 381      general register encoding in the i.tm.mode and i.tm.regmem fields,
 382      eg. control reg moves.  They really ought to support a memory form,
 383      but don't, so we add an InvMem flag to the register operand to
 384      indicate that it should be encoded in the i.tm.regmem field.  */
 385 #define InvMem      0x80000000
 386
 387 #define Reg     (Reg8|Reg16|Reg32|Reg64) /* gen'l register */
 388 #define WordReg (Reg16|Reg32|Reg64)
 389 #define ImplicitRegister (InOutPortReg|ShiftCount|Acc|FloatAcc)
 390 #define Imm     (Imm8|Imm8S|Imm16|Imm32S|Imm32|Imm64) /* gen'l immediate */
 391 #define EncImm  (Imm8|Imm16|Imm32|Imm32S) /* Encodable gen'l immediate */
 392 #define Disp    (Disp8|Disp16|Disp32|Disp32S|Disp64) /* General displacement */
 393 #define AnyMem  (Disp8|Disp16|Disp32|Disp32S|BaseIndex|InvMem)  /* General memory */
 394   /* The following aliases are defined because the opcode table
 395      carefully specifies the allowed memory types for each instruction.
 396      At the moment we can only tell a memory reference size by the
 397      instruction suffix, so there's not much point in defining Mem8,
 398      Mem16, Mem32 and Mem64 opcode modifiers - We might as well just use
 399      the suffix directly to check memory operands.  */
 400 #define LLongMem AnyMem         /* 64 bits (or more) */
 401 #define LongMem AnyMem          /* 32 bit memory ref */
 402 #define ShortMem AnyMem         /* 16 bit memory ref */
 403 #define WordMem AnyMem          /* 16 or 32 bit memory ref */
 404 #define ByteMem AnyMem          /* 8 bit memory ref */
 405 }
 406 template;
 407
 408 /*
 409   'templates' is for grouping together 'template' structures for opcodes
 410   of the same name.  This is only used for storing the insns in the grand
 411   ole hash table of insns.
 412   The templates themselves start at START and range up to (but not including)
 413   END.
 414   */
 415 typedef struct
 416 {
 417   const template *start;
 418   const template *end;
 419 }
 420 templates;
 421
 422 /* these are for register name --> number & type hash lookup */
 423 typedef struct
 424 {
 425   char *reg_name;
 426   unsigned int reg_type;
 427   unsigned int reg_flags;
 428 #define RegRex      0x1  /* Extended register.  */
 429 #define RegRex64    0x2  /* Extended 8 bit register.  */
 430   unsigned int reg_num;
 431 }
 432 reg_entry;
 433
 434 typedef struct
 435 {
 436   char *seg_name;
 437   unsigned int seg_prefix;
 438 }
 439 seg_entry;
 440
 441 /* 386 operand encoding bytes:  see 386 book for details of this.  */
 442 typedef struct
 443 {
 444   unsigned int regmem;  /* codes register or memory operand */
 445   unsigned int reg;     /* codes register operand (or extended opcode) */
 446   unsigned int mode;    /* how to interpret regmem & reg */
 447 }
 448 modrm_byte;
 449
 450 /* x86-64 extension prefix.  */
 451 typedef struct
 452   {
 453     unsigned int mode64;
 454     unsigned int extX;          /* Used to extend modrm reg field.  */
 455     unsigned int extY;          /* Used to extend SIB index field.  */
 456     unsigned int extZ;          /* Used to extend modrm reg/mem, SIB base, modrm base fields.  */
 457     unsigned int empty;         /* Used to old-style byte registers to new style.  */
 458   }
 459 rex_byte;
 460
 461 /* 386 opcode byte to code indirect addressing.  */
 462 typedef struct
 463 {
 464   unsigned base;
 465   unsigned index;
 466   unsigned scale;
 467 }
 468 sib_byte;
 469
 470 /* x86 arch names and features */
 471 typedef struct
 472 {
 473   const char *name;     /* arch name */
 474   unsigned int flags;   /* cpu feature flags */
 475 }
 476 arch_entry;
 477
 478 /* The name of the global offset table generated by the compiler. Allow
 479    this to be overridden if need be.  */
 480 #ifndef GLOBAL_OFFSET_TABLE_NAME
 481 #define GLOBAL_OFFSET_TABLE_NAME "_GLOBAL_OFFSET_TABLE_"
 482 #endif
 483
 484 #ifdef BFD_ASSEMBLER
 485 void i386_validate_fix PARAMS ((struct fix *));
 486 #define TC_VALIDATE_FIX(FIXP,SEGTYPE,SKIP) i386_validate_fix(FIXP)
 487 #endif
 488
 489 #endif /* TC_I386 */
 490
 491 #define md_operand(x)
 492
 493 extern const struct relax_type md_relax_table[];
 494 #define TC_GENERIC_RELAX_TABLE md_relax_table
 495
 496 #define md_do_align(n, fill, len, max, around)                          \
 497 if ((n) && !need_pass_2                                                 \
 498     && (!(fill) || ((char)*(fill) == (char)0x90 && (len) == 1))         \
 499     && subseg_text_p (now_seg))                                         \
 500   {                                                                     \
 501     frag_align_code ((n), (max));                                       \
 502     goto around;                                                        \
 503   }
 504
 505 #define MAX_MEM_FOR_RS_ALIGN_CODE  15
 506
 507 extern void i386_align_code PARAMS ((fragS *, int));
 508
 509 #define HANDLE_ALIGN(fragP)                                             \
 510 if (fragP->fr_type == rs_align_code)                                    \
 511   i386_align_code (fragP, (fragP->fr_next->fr_address                   \
 512                            - fragP->fr_address                          \
 513                            - fragP->fr_fix));
 514
 515 /* call md_apply_fix3 with segment instead of md_apply_fix */
 516 #define MD_APPLY_FIX3
 517
 518 void i386_print_statistics PARAMS ((FILE *));
 519 #define tc_print_statistics i386_print_statistics
 520
 521 #define md_number_to_chars number_to_chars_littleendian
 522
 523 #ifdef SCO_ELF
 524 #define tc_init_after_args() sco_id ()
 525 extern void sco_id PARAMS ((void));
 526 #endif
 527
 528 #define DIFF_EXPR_OK    /* foo-. gets turned into PC relative relocs */