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 */
 126 #define LONG_DOUBLE_MNEM_SUFFIX 'x'
 127
 128 #define END_OF_INSN '\0'
 129
 130 /*
 131   'templates' is for grouping together 'template' structures for opcodes
 132   of the same name.  This is only used for storing the insns in the grand
 133   ole hash table of insns.
 134   The templates themselves start at START and range up to (but not including)
 135   END.
 136   */
 137 typedef struct
 138 {
 139   const template *start;
 140   const template *end;
 141 }
 142 templates;
 143
 144 /* 386 operand encoding bytes:  see 386 book for details of this.  */
 145 typedef struct
 146 {
 147   unsigned int regmem;  /* codes register or memory operand */
 148   unsigned int reg;     /* codes register operand (or extended opcode) */
 149   unsigned int mode;    /* how to interpret regmem & reg */
 150 }
 151 modrm_byte;
 152
 153 /* x86-64 extension prefix.  */
 154 typedef int rex_byte;
 155
 156 /* The SSE5 instructions have a two bit instruction modifier (OC) that
 157    is stored in two separate bytes in the instruction.  Pick apart OC
 158    into the 2 separate bits for instruction.  */
 159 #define DREX_OC0(x)     (((x) & 1) != 0)
 160 #define DREX_OC1(x)     (((x) & 2) != 0)
 161
 162 #define DREX_OC0_MASK   (1 << 3)        /* set OC0 in byte 4 */
 163 #define DREX_OC1_MASK   (1 << 2)        /* set OC1 in byte 3 */
 164
 165 /* OC mappings */
 166 #define DREX_XMEM_X1_X2_X2 0    /* 4 op insn, dest = src3, src1 = reg/mem */
 167 #define DREX_X1_XMEM_X2_X2 1    /* 4 op insn, dest = src3, src2 = reg/mem */
 168 #define DREX_X1_XMEM_X2_X1 2    /* 4 op insn, dest = src1, src2 = reg/mem */
 169 #define DREX_X1_X2_XMEM_X1 3    /* 4 op insn, dest = src1, src3 = reg/mem */
 170
 171 #define DREX_XMEM_X1_X2    0    /* 3 op insn, src1 = reg/mem */
 172 #define DREX_X1_XMEM_X2    1    /* 3 op insn, src1 = reg/mem */
 173
 174 /* Information needed to create the DREX byte in SSE5 instructions.  */
 175 typedef struct
 176 {
 177   unsigned int reg;             /* register */
 178   unsigned int rex;             /* REX flags */
 179   unsigned int modrm_reg;       /* which arg goes in the modrm.reg field */
 180   unsigned int modrm_regmem;    /* which arg goes in the modrm.regmem field */
 181 } drex_byte;
 182
 183 /* 386 opcode byte to code indirect addressing.  */
 184 typedef struct
 185 {
 186   unsigned base;
 187   unsigned index;
 188   unsigned scale;
 189 }
 190 sib_byte;
 191
 192 enum processor_type
 193 {
 194   PROCESSOR_UNKNOWN,
 195   PROCESSOR_I386,
 196   PROCESSOR_I486,
 197   PROCESSOR_PENTIUM,
 198   PROCESSOR_PENTIUMPRO,
 199   PROCESSOR_PENTIUM4,
 200   PROCESSOR_NOCONA,
 201   PROCESSOR_CORE,
 202   PROCESSOR_CORE2,
 203   PROCESSOR_K6,
 204   PROCESSOR_ATHLON,
 205   PROCESSOR_K8,
 206   PROCESSOR_GENERIC32,
 207   PROCESSOR_GENERIC64,
 208   PROCESSOR_AMDFAM10
 209 };
 210
 211 /* x86 arch names, types and features */
 212 typedef struct
 213 {
 214   const char *name;             /* arch name */
 215   enum processor_type type;     /* arch type */
 216   i386_cpu_flags flags;         /* cpu feature flags */
 217 }
 218 arch_entry;
 219
 220 /* The name of the global offset table generated by the compiler. Allow
 221    this to be overridden if need be.  */
 222 #ifndef GLOBAL_OFFSET_TABLE_NAME
 223 #define GLOBAL_OFFSET_TABLE_NAME "_GLOBAL_OFFSET_TABLE_"
 224 #endif
 225
 226 #if (defined (OBJ_ELF) || defined (OBJ_MAYBE_ELF)) && !defined (LEX_AT)
 227 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) x86_cons (EXP, NBYTES)
 228 extern void x86_cons (expressionS *, int);
 229 #endif
 230
 231 #define TC_CONS_FIX_NEW(FRAG,OFF,LEN,EXP) x86_cons_fix_new(FRAG, OFF, LEN, EXP)
 232 extern void x86_cons_fix_new
 233   (fragS *, unsigned int, unsigned int, expressionS *);
 234
 235 #define DIFF_EXPR_OK    /* foo-. gets turned into PC relative relocs */
 236
 237 #define NO_RELOC BFD_RELOC_NONE
 238
 239 void i386_validate_fix (struct fix *);
 240 #define TC_VALIDATE_FIX(FIX,SEGTYPE,SKIP) i386_validate_fix(FIX)
 241
 242 #define tc_fix_adjustable(X)  tc_i386_fix_adjustable(X)
 243 extern int tc_i386_fix_adjustable (struct fix *);
 244
 245 /* Values passed to md_apply_fix don't include the symbol value.  */
 246 #define MD_APPLY_SYM_VALUE(FIX) 0
 247
 248 /* ELF wants external syms kept, as does PE COFF.  */
 249 #if defined (TE_PE) && defined (STRICT_PE_FORMAT)
 250 #define EXTERN_FORCE_RELOC                              \
 251   (OUTPUT_FLAVOR == bfd_target_elf_flavour              \
 252    || OUTPUT_FLAVOR == bfd_target_coff_flavour)
 253 #else
 254 #define EXTERN_FORCE_RELOC                              \
 255   (OUTPUT_FLAVOR == bfd_target_elf_flavour)
 256 #endif
 257
 258 /* This expression evaluates to true if the relocation is for a local
 259    object for which we still want to do the relocation at runtime.
 260    False if we are willing to perform this relocation while building
 261    the .o file.  GOTOFF does not need to be checked here because it is
 262    not pcrel.  I am not sure if some of the others are ever used with
 263    pcrel, but it is easier to be safe than sorry.  */
 264
 265 #define TC_FORCE_RELOCATION_LOCAL(FIX)                  \
 266   (!(FIX)->fx_pcrel                                     \
 267    || (FIX)->fx_r_type == BFD_RELOC_386_PLT32           \
 268    || (FIX)->fx_r_type == BFD_RELOC_386_GOT32           \
 269    || (FIX)->fx_r_type == BFD_RELOC_386_GOTPC           \
 270    || TC_FORCE_RELOCATION (FIX))
 271
 272 extern int i386_parse_name (char *, expressionS *, char *);
 273 #define md_parse_name(s, e, m, c) i386_parse_name (s, e, c)
 274
 275 #define md_register_arithmetic 0
 276
 277 extern const struct relax_type md_relax_table[];
 278 #define TC_GENERIC_RELAX_TABLE md_relax_table
 279
 280 extern int optimize_align_code;
 281
 282 #define md_do_align(n, fill, len, max, around)                          \
 283 if ((n)                                                                 \
 284     && !need_pass_2                                                     \
 285     && optimize_align_code                                              \
 286     && (!(fill)                                                         \
 287         || ((char)*(fill) == (char)0x90 && (len) == 1))                 \
 288     && subseg_text_p (now_seg))                                         \
 289   {                                                                     \
 290     frag_align_code ((n), (max));                                       \
 291     goto around;                                                        \
 292   }
 293
 294 #define MAX_MEM_FOR_RS_ALIGN_CODE  31
 295
 296 extern void i386_align_code (fragS *, int);
 297
 298 #define HANDLE_ALIGN(fragP)                                             \
 299 if (fragP->fr_type == rs_align_code)                                    \
 300   i386_align_code (fragP, (fragP->fr_next->fr_address                   \
 301                            - fragP->fr_address                          \
 302                            - fragP->fr_fix));
 303
 304 void i386_print_statistics (FILE *);
 305 #define tc_print_statistics i386_print_statistics
 306
 307 #define md_number_to_chars number_to_chars_littleendian
 308
 309 #ifdef SCO_ELF
 310 #define tc_init_after_args() sco_id ()
 311 extern void sco_id (void);
 312 #endif
 313
 314 #define WORKING_DOT_WORD 1
 315
 316 /* We want .cfi_* pseudo-ops for generating unwind info.  */
 317 #define TARGET_USE_CFIPOP 1
 318
 319 extern unsigned int x86_dwarf2_return_column;
 320 #define DWARF2_DEFAULT_RETURN_COLUMN x86_dwarf2_return_column
 321
 322 extern int x86_cie_data_alignment;
 323 #define DWARF2_CIE_DATA_ALIGNMENT x86_cie_data_alignment
 324
 325 #define tc_regname_to_dw2regnum tc_x86_regname_to_dw2regnum
 326 extern int tc_x86_regname_to_dw2regnum (char *);
 327
 328 #define tc_cfi_frame_initial_instructions tc_x86_frame_initial_instructions
 329 extern void tc_x86_frame_initial_instructions (void);
 330
 331 #define md_elf_section_type(str,len) i386_elf_section_type (str, len)
 332 extern int i386_elf_section_type (const char *, size_t);
 333
 334 /* Support for SHF_X86_64_LARGE */
 335 extern int x86_64_section_word (char *, size_t);
 336 extern int x86_64_section_letter (int, char **);
 337 #define md_elf_section_letter(LETTER, PTR_MSG)  x86_64_section_letter (LETTER, PTR_MSG)
 338 #define md_elf_section_word(STR, LEN)           x86_64_section_word (STR, LEN)
 339
 340 #ifdef TE_PE
 341
 342 #define O_secrel O_md1
 343
 344 #define TC_DWARF2_EMIT_OFFSET  tc_pe_dwarf2_emit_offset
 345 void tc_pe_dwarf2_emit_offset (symbolS *, unsigned int);
 346
 347 #endif /* TE_PE */
 348
 349 #endif /* TC_I386 */