gas/config/tc-i386.h

   1 /* tc-i386.h -- Header file for tc-i386.c
   2    Copyright 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
   3    2001, 2002, 2003, 2004, 2005, 2006, 2007
   4    Free Software Foundation, Inc.
   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 published by
  10    the Free Software Foundation; either version 3, or (at your option)
  11    any later version.
  12
  13    GAS is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    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 #ifndef TC_I386
  24 #define TC_I386 1
  25
  26 #include "opcodes/i386-opc.h"
  27
  28 struct fix;
  29
  30 #define TARGET_BYTES_BIG_ENDIAN 0
  31
  32 #define TARGET_ARCH             bfd_arch_i386
  33 #define TARGET_MACH             (i386_mach ())
  34 extern unsigned long i386_mach (void);
  35
  36 #ifdef TE_FreeBSD
  37 #define AOUT_TARGET_FORMAT      "a.out-i386-freebsd"
  38 #endif
  39 #ifdef TE_NetBSD
  40 #define AOUT_TARGET_FORMAT      "a.out-i386-netbsd"
  41 #endif
  42 #ifdef TE_386BSD
  43 #define AOUT_TARGET_FORMAT      "a.out-i386-bsd"
  44 #endif
  45 #ifdef TE_LINUX
  46 #define AOUT_TARGET_FORMAT      "a.out-i386-linux"
  47 #endif
  48 #ifdef TE_Mach
  49 #define AOUT_TARGET_FORMAT      "a.out-mach3"
  50 #endif
  51 #ifdef TE_DYNIX
  52 #define AOUT_TARGET_FORMAT      "a.out-i386-dynix"
  53 #endif
  54 #ifndef AOUT_TARGET_FORMAT
  55 #define AOUT_TARGET_FORMAT      "a.out-i386"
  56 #endif
  57
  58 #ifdef TE_FreeBSD
  59 #define ELF_TARGET_FORMAT       "elf32-i386-freebsd"
  60 #define ELF_TARGET_FORMAT64     "elf64-x86-64-freebsd"
  61 #elif defined (TE_VXWORKS)
  62 #define ELF_TARGET_FORMAT       "elf32-i386-vxworks"
  63 #endif
  64
  65 #ifndef ELF_TARGET_FORMAT
  66 #define ELF_TARGET_FORMAT       "elf32-i386"
  67 #endif
  68
  69 #ifndef ELF_TARGET_FORMAT64
  70 #define ELF_TARGET_FORMAT64     "elf64-x86-64"
  71 #endif
  72
  73 #if ((defined (OBJ_MAYBE_COFF) && defined (OBJ_MAYBE_AOUT)) \
  74      || defined (OBJ_ELF) || defined (OBJ_MAYBE_ELF))
  75 extern const char *i386_target_format (void);
  76 #define TARGET_FORMAT i386_target_format ()
  77 #else
  78 #ifdef OBJ_ELF
  79 #define TARGET_FORMAT           ELF_TARGET_FORMAT
  80 #endif
  81 #ifdef OBJ_AOUT
  82 #define TARGET_FORMAT           AOUT_TARGET_FORMAT
  83 #endif
  84 #endif
  85
  86 #if (defined (OBJ_MAYBE_ELF) || defined (OBJ_ELF))
  87 #define md_end i386_elf_emit_arch_note
  88 extern void i386_elf_emit_arch_note (void);
  89 #endif
  90
  91 #define SUB_SEGMENT_ALIGN(SEG, FRCHAIN) 0
  92
  93 #define LOCAL_LABELS_FB 1
  94
  95 extern const char extra_symbol_chars[];
  96 #define tc_symbol_chars extra_symbol_chars
  97
  98 extern const char *i386_comment_chars;
  99 #define tc_comment_chars i386_comment_chars
 100
 101 /* Prefixes will be emitted in the order defined below.
 102    WAIT_PREFIX must be the first prefix since FWAIT is really is an
 103    instruction, and so must come before any prefixes.
 104    The preferred prefix order is SEG_PREFIX, ADDR_PREFIX, DATA_PREFIX,
 105    LOCKREP_PREFIX.  */
 106 #define WAIT_PREFIX     0
 107 #define SEG_PREFIX      1
 108 #define ADDR_PREFIX     2
 109 #define DATA_PREFIX     3
 110 #define LOCKREP_PREFIX  4
 111 #define REX_PREFIX      5       /* must come last.  */
 112 #define MAX_PREFIXES    6       /* max prefixes per opcode */
 113
 114 /* we define the syntax here (modulo base,index,scale syntax) */
 115 #define REGISTER_PREFIX '%'
 116 #define IMMEDIATE_PREFIX '$'
 117 #define ABSOLUTE_PREFIX '*'
 118
 119 /* these are the instruction mnemonic suffixes.  */
 120 #define WORD_MNEM_SUFFIX  'w'
 121 #define BYTE_MNEM_SUFFIX  'b'
 122 #define SHORT_MNEM_SUFFIX 's'
 123 #define LONG_MNEM_SUFFIX  'l'
 124 #define QWORD_MNEM_SUFFIX  'q'
 125 /* Intel Syntax.  Use a non-ascii letter since since it never appears
 126    in instructions.  */
 127 #define LONG_DOUBLE_MNEM_SUFFIX '\1'
 128
 129 #define END_OF_INSN '\0'
 130
 131 /*
 132   'templates' is for grouping together 'template' structures for opcodes
 133   of the same name.  This is only used for storing the insns in the grand
 134   ole hash table of insns.
 135   The templates themselves start at START and range up to (but not including)
 136   END.
 137   */
 138 typedef struct
 139 {
 140   const template *start;
 141   const template *end;
 142 }
 143 templates;
 144
 145 /* 386 operand encoding bytes:  see 386 book for details of this.  */
 146 typedef struct
 147 {
 148   unsigned int regmem;  /* codes register or memory operand */
 149   unsigned int reg;     /* codes register operand (or extended opcode) */
 150   unsigned int mode;    /* how to interpret regmem & reg */
 151 }
 152 modrm_byte;
 153
 154 /* x86-64 extension prefix.  */
 155 typedef int rex_byte;
 156
 157 /* The SSE5 instructions have a two bit instruction modifier (OC) that
 158    is stored in two separate bytes in the instruction.  Pick apart OC
 159    into the 2 separate bits for instruction.  */
 160 #define DREX_OC0(x)     (((x) & 1) != 0)
 161 #define DREX_OC1(x)     (((x) & 2) != 0)
 162
 163 #define DREX_OC0_MASK   (1 << 3)        /* set OC0 in byte 4 */
 164 #define DREX_OC1_MASK   (1 << 2)        /* set OC1 in byte 3 */
 165
 166 /* OC mappings */
 167 #define DREX_XMEM_X1_X2_X2 0    /* 4 op insn, dest = src3, src1 = reg/mem */
 168 #define DREX_X1_XMEM_X2_X2 1    /* 4 op insn, dest = src3, src2 = reg/mem */
 169 #define DREX_X1_XMEM_X2_X1 2    /* 4 op insn, dest = src1, src2 = reg/mem */
 170 #define DREX_X1_X2_XMEM_X1 3    /* 4 op insn, dest = src1, src3 = reg/mem */
 171
 172 #define DREX_XMEM_X1_X2    0    /* 3 op insn, src1 = reg/mem */
 173 #define DREX_X1_XMEM_X2    1    /* 3 op insn, src1 = reg/mem */
 174
 175 /* Information needed to create the DREX byte in SSE5 instructions.  */
 176 typedef struct
 177 {
 178   unsigned int reg;             /* register */
 179   unsigned int rex;             /* REX flags */
 180   unsigned int modrm_reg;       /* which arg goes in the modrm.reg field */
 181   unsigned int modrm_regmem;    /* which arg goes in the modrm.regmem field */
 182 } drex_byte;
 183
 184 /* 386 opcode byte to code indirect addressing.  */
 185 typedef struct
 186 {
 187   unsigned base;
 188   unsigned index;
 189   unsigned scale;
 190 }
 191 sib_byte;
 192
 193 enum processor_type
 194 {
 195   PROCESSOR_UNKNOWN,
 196   PROCESSOR_I386,
 197   PROCESSOR_I486,
 198   PROCESSOR_PENTIUM,
 199   PROCESSOR_PENTIUMPRO,
 200   PROCESSOR_PENTIUM4,
 201   PROCESSOR_NOCONA,
 202   PROCESSOR_CORE,
 203   PROCESSOR_CORE2,
 204   PROCESSOR_K6,
 205   PROCESSOR_ATHLON,
 206   PROCESSOR_K8,
 207   PROCESSOR_GENERIC32,
 208   PROCESSOR_GENERIC64,
 209   PROCESSOR_AMDFAM10
 210 };
 211
 212 /* x86 arch names, types and features */
 213 typedef struct
 214 {
 215   const char *name;             /* arch name */
 216   enum processor_type type;     /* arch type */
 217   i386_cpu_flags flags;         /* cpu feature flags */
 218 }
 219 arch_entry;
 220
 221 /* The name of the global offset table generated by the compiler. Allow
 222    this to be overridden if need be.  */
 223 #ifndef GLOBAL_OFFSET_TABLE_NAME
 224 #define GLOBAL_OFFSET_TABLE_NAME "_GLOBAL_OFFSET_TABLE_"
 225 #endif
 226
 227 #if (defined (OBJ_ELF) || defined (OBJ_MAYBE_ELF)) && !defined (LEX_AT)
 228 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) x86_cons (EXP, NBYTES)
 229 extern void x86_cons (expressionS *, int);
 230 #endif
 231
 232 #define TC_CONS_FIX_NEW(FRAG,OFF,LEN,EXP) x86_cons_fix_new(FRAG, OFF, LEN, EXP)
 233 extern void x86_cons_fix_new
 234   (fragS *, unsigned int, unsigned int, expressionS *);
 235
 236 #define DIFF_EXPR_OK    /* foo-. gets turned into PC relative relocs */
 237
 238 #define NO_RELOC BFD_RELOC_NONE
 239
 240 void i386_validate_fix (struct fix *);
 241 #define TC_VALIDATE_FIX(FIX,SEGTYPE,SKIP) i386_validate_fix(FIX)
 242
 243 #define tc_fix_adjustable(X)  tc_i386_fix_adjustable(X)
 244 extern int tc_i386_fix_adjustable (struct fix *);
 245
 246 /* Values passed to md_apply_fix don't include the symbol value.  */
 247 #define MD_APPLY_SYM_VALUE(FIX) 0
 248
 249 /* ELF wants external syms kept, as does PE COFF.  */
 250 #if defined (TE_PE) && defined (STRICT_PE_FORMAT)
 251 #define EXTERN_FORCE_RELOC                              \
 252   (OUTPUT_FLAVOR == bfd_target_elf_flavour              \
 253    || OUTPUT_FLAVOR == bfd_target_coff_flavour)
 254 #else
 255 #define EXTERN_FORCE_RELOC                              \
 256   (OUTPUT_FLAVOR == bfd_target_elf_flavour)
 257 #endif
 258
 259 /* This expression evaluates to true if the relocation is for a local
 260    object for which we still want to do the relocation at runtime.
 261    False if we are willing to perform this relocation while building
 262    the .o file.  GOTOFF does not need to be checked here because it is
 263    not pcrel.  I am not sure if some of the others are ever used with
 264    pcrel, but it is easier to be safe than sorry.  */
 265
 266 #define TC_FORCE_RELOCATION_LOCAL(FIX)                  \
 267   (!(FIX)->fx_pcrel                                     \
 268    || (FIX)->fx_r_type == BFD_RELOC_386_PLT32           \
 269    || (FIX)->fx_r_type == BFD_RELOC_386_GOT32           \
 270    || (FIX)->fx_r_type == BFD_RELOC_386_GOTPC           \
 271    || TC_FORCE_RELOCATION (FIX))
 272
 273 extern int i386_parse_name (char *, expressionS *, char *);
 274 #define md_parse_name(s, e, m, c) i386_parse_name (s, e, c)
 275
 276 #define md_register_arithmetic 0
 277
 278 extern const struct relax_type md_relax_table[];
 279 #define TC_GENERIC_RELAX_TABLE md_relax_table
 280
 281 extern int optimize_align_code;
 282
 283 #define md_do_align(n, fill, len, max, around)                          \
 284 if ((n)                                                                 \
 285     && !need_pass_2                                                     \
 286     && optimize_align_code                                              \
 287     && (!(fill)                                                         \
 288         || ((char)*(fill) == (char)0x90 && (len) == 1))                 \
 289     && subseg_text_p (now_seg))                                         \
 290   {                                                                     \
 291     frag_align_code ((n), (max));                                       \
 292     goto around;                                                        \
 293   }
 294
 295 #define MAX_MEM_FOR_RS_ALIGN_CODE  31
 296
 297 extern void i386_align_code (fragS *, int);
 298
 299 #define HANDLE_ALIGN(fragP)                                             \
 300 if (fragP->fr_type == rs_align_code)                                    \
 301   i386_align_code (fragP, (fragP->fr_next->fr_address                   \
 302                            - fragP->fr_address                          \
 303                            - fragP->fr_fix));
 304
 305 void i386_print_statistics (FILE *);
 306 #define tc_print_statistics i386_print_statistics
 307
 308 #define md_number_to_chars number_to_chars_littleendian
 309
 310 #ifdef SCO_ELF
 311 #define tc_init_after_args() sco_id ()
 312 extern void sco_id (void);
 313 #endif
 314
 315 #define WORKING_DOT_WORD 1
 316
 317 /* We want .cfi_* pseudo-ops for generating unwind info.  */
 318 #define TARGET_USE_CFIPOP 1
 319
 320 extern unsigned int x86_dwarf2_return_column;
 321 #define DWARF2_DEFAULT_RETURN_COLUMN x86_dwarf2_return_column
 322
 323 extern int x86_cie_data_alignment;
 324 #define DWARF2_CIE_DATA_ALIGNMENT x86_cie_data_alignment
 325
 326 #define tc_regname_to_dw2regnum tc_x86_regname_to_dw2regnum
 327 extern int tc_x86_regname_to_dw2regnum (char *);
 328
 329 #define tc_cfi_frame_initial_instructions tc_x86_frame_initial_instructions
 330 extern void tc_x86_frame_initial_instructions (void);
 331
 332 #define md_elf_section_type(str,len) i386_elf_section_type (str, len)
 333 extern int i386_elf_section_type (const char *, size_t);
 334
 335 /* Support for SHF_X86_64_LARGE */
 336 extern int x86_64_section_word (char *, size_t);
 337 extern int x86_64_section_letter (int, char **);
 338 #define md_elf_section_letter(LETTER, PTR_MSG)  x86_64_section_letter (LETTER, PTR_MSG)
 339 #define md_elf_section_word(STR, LEN)           x86_64_section_word (STR, LEN)
 340
 341 #ifdef TE_PE
 342
 343 #define O_secrel O_md1
 344
 345 #define TC_DWARF2_EMIT_OFFSET  tc_pe_dwarf2_emit_offset
 346 void tc_pe_dwarf2_emit_offset (symbolS *, unsigned int);
 347
 348 #endif /* TE_PE */
 349
 350 #endif /* TC_I386 */