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 /* 386 opcode byte to code indirect addressing.  */
 157 typedef struct
 158 {
 159   unsigned base;
 160   unsigned index;
 161   unsigned scale;
 162 }
 163 sib_byte;
 164
 165 enum processor_type
 166 {
 167   PROCESSOR_UNKNOWN,
 168   PROCESSOR_I386,
 169   PROCESSOR_I486,
 170   PROCESSOR_PENTIUM,
 171   PROCESSOR_PENTIUMPRO,
 172   PROCESSOR_PENTIUM4,
 173   PROCESSOR_NOCONA,
 174   PROCESSOR_CORE,
 175   PROCESSOR_CORE2,
 176   PROCESSOR_K6,
 177   PROCESSOR_ATHLON,
 178   PROCESSOR_K8,
 179   PROCESSOR_GENERIC32,
 180   PROCESSOR_GENERIC64,
 181   PROCESSOR_AMDFAM10
 182 };
 183
 184 /* x86 arch names, types and features */
 185 typedef struct
 186 {
 187   const char *name;             /* arch name */
 188   enum processor_type type;     /* arch type */
 189   unsigned int flags;           /* cpu feature flags */
 190 }
 191 arch_entry;
 192
 193 /* The name of the global offset table generated by the compiler. Allow
 194    this to be overridden if need be.  */
 195 #ifndef GLOBAL_OFFSET_TABLE_NAME
 196 #define GLOBAL_OFFSET_TABLE_NAME "_GLOBAL_OFFSET_TABLE_"
 197 #endif
 198
 199 #if (defined (OBJ_ELF) || defined (OBJ_MAYBE_ELF)) && !defined (LEX_AT)
 200 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) x86_cons (EXP, NBYTES)
 201 extern void x86_cons (expressionS *, int);
 202
 203 #endif
 204
 205 #define TC_CONS_FIX_NEW(FRAG,OFF,LEN,EXP) x86_cons_fix_new(FRAG, OFF, LEN, EXP)
 206 extern void x86_cons_fix_new
 207   (fragS *, unsigned int, unsigned int, expressionS *);
 208
 209 #define DIFF_EXPR_OK    /* foo-. gets turned into PC relative relocs */
 210
 211 #define NO_RELOC BFD_RELOC_NONE
 212
 213 void i386_validate_fix (struct fix *);
 214 #define TC_VALIDATE_FIX(FIX,SEGTYPE,SKIP) i386_validate_fix(FIX)
 215
 216 #define tc_fix_adjustable(X)  tc_i386_fix_adjustable(X)
 217 extern int tc_i386_fix_adjustable (struct fix *);
 218
 219 /* Values passed to md_apply_fix don't include the symbol value.  */
 220 #define MD_APPLY_SYM_VALUE(FIX) 0
 221
 222 /* ELF wants external syms kept, as does PE COFF.  */
 223 #if defined (TE_PE) && defined (STRICT_PE_FORMAT)
 224 #define EXTERN_FORCE_RELOC                              \
 225   (OUTPUT_FLAVOR == bfd_target_elf_flavour              \
 226    || OUTPUT_FLAVOR == bfd_target_coff_flavour)
 227 #else
 228 #define EXTERN_FORCE_RELOC                              \
 229   (OUTPUT_FLAVOR == bfd_target_elf_flavour)
 230 #endif
 231
 232 /* This expression evaluates to true if the relocation is for a local
 233    object for which we still want to do the relocation at runtime.
 234    False if we are willing to perform this relocation while building
 235    the .o file.  GOTOFF does not need to be checked here because it is
 236    not pcrel.  I am not sure if some of the others are ever used with
 237    pcrel, but it is easier to be safe than sorry.  */
 238
 239 #define TC_FORCE_RELOCATION_LOCAL(FIX)                  \
 240   (!(FIX)->fx_pcrel                                     \
 241    || (FIX)->fx_r_type == BFD_RELOC_386_PLT32           \
 242    || (FIX)->fx_r_type == BFD_RELOC_386_GOT32           \
 243    || (FIX)->fx_r_type == BFD_RELOC_386_GOTPC           \
 244    || TC_FORCE_RELOCATION (FIX))
 245
 246 extern int i386_parse_name (char *, expressionS *, char *);
 247 #define md_parse_name(s, e, m, c) i386_parse_name (s, e, c)
 248
 249 extern const struct relax_type md_relax_table[];
 250 #define TC_GENERIC_RELAX_TABLE md_relax_table
 251
 252 extern int optimize_align_code;
 253
 254 #define md_do_align(n, fill, len, max, around)                          \
 255 if ((n)                                                                 \
 256     && !need_pass_2                                                     \
 257     && optimize_align_code                                              \
 258     && (!(fill)                                                         \
 259         || ((char)*(fill) == (char)0x90 && (len) == 1))                 \
 260     && subseg_text_p (now_seg))                                         \
 261   {                                                                     \
 262     frag_align_code ((n), (max));                                       \
 263     goto around;                                                        \
 264   }
 265
 266 #define MAX_MEM_FOR_RS_ALIGN_CODE  31
 267
 268 extern void i386_align_code (fragS *, int);
 269
 270 #define HANDLE_ALIGN(fragP)                                             \
 271 if (fragP->fr_type == rs_align_code)                                    \
 272   i386_align_code (fragP, (fragP->fr_next->fr_address                   \
 273                            - fragP->fr_address                          \
 274                            - fragP->fr_fix));
 275
 276 void i386_print_statistics (FILE *);
 277 #define tc_print_statistics i386_print_statistics
 278
 279 #define md_number_to_chars number_to_chars_littleendian
 280
 281 #ifdef SCO_ELF
 282 #define tc_init_after_args() sco_id ()
 283 extern void sco_id (void);
 284 #endif
 285
 286 #define WORKING_DOT_WORD 1
 287
 288 /* We want .cfi_* pseudo-ops for generating unwind info.  */
 289 #define TARGET_USE_CFIPOP 1
 290
 291 extern unsigned int x86_dwarf2_return_column;
 292 #define DWARF2_DEFAULT_RETURN_COLUMN x86_dwarf2_return_column
 293
 294 extern int x86_cie_data_alignment;
 295 #define DWARF2_CIE_DATA_ALIGNMENT x86_cie_data_alignment
 296
 297 #define tc_regname_to_dw2regnum tc_x86_regname_to_dw2regnum
 298 extern int tc_x86_regname_to_dw2regnum (char *);
 299
 300 #define tc_cfi_frame_initial_instructions tc_x86_frame_initial_instructions
 301 extern void tc_x86_frame_initial_instructions (void);
 302
 303 #define md_elf_section_type(str,len) i386_elf_section_type (str, len)
 304 extern int i386_elf_section_type (const char *, size_t);
 305
 306 /* Support for SHF_X86_64_LARGE */
 307 extern int x86_64_section_word (char *, size_t);
 308 extern int x86_64_section_letter (int, char **);
 309 #define md_elf_section_letter(LETTER, PTR_MSG)  x86_64_section_letter (LETTER, PTR_MSG)
 310 #define md_elf_section_word(STR, LEN)           x86_64_section_word (STR, LEN)
 311
 312 #ifdef TE_PE
 313
 314 #define O_secrel O_md1
 315
 316 #define TC_DWARF2_EMIT_OFFSET  tc_pe_dwarf2_emit_offset
 317 void tc_pe_dwarf2_emit_offset (symbolS *, unsigned int);
 318
 319 #endif /* TE_PE */
 320
 321 /* NativeClient specific additions. */
 322
 323 /* log2 of the instruction alignment */
 324 extern int nacl_alignment;
 325
 326 /* library mode: 16-byte alignment, calls end 32-byte chunks. */
 327 extern int nacl_library_mode;
 328
 329 #endif /* TC_I386 */