tc-i386.h revision 33973
1/* tc-i386.h -- Header file for tc-i386.c 2 Copyright (C) 1989, 92, 93, 94, 95, 96, 1997 Free Software Foundation. 3 4 This file is part of GAS, the GNU Assembler. 5 6 GAS is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 2, or (at your option) 9 any later version. 10 11 GAS is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 GNU General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with GAS; see the file COPYING. If not, write to the Free 18 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 19 02111-1307, USA. */ 20 21#ifndef TC_I386 22#define TC_I386 1 23 24#ifdef ANSI_PROTOTYPES 25struct fix; 26#endif 27 28#define TARGET_BYTES_BIG_ENDIAN 0 29 30#ifdef TE_LYNX 31#define TARGET_FORMAT "coff-i386-lynx" 32#endif 33 34#ifdef BFD_ASSEMBLER 35/* This is used to determine relocation types in tc-i386.c. The first 36 parameter is the current relocation type, the second one is the desired 37 type. The idea is that if the original type is already some kind of PIC 38 relocation, we leave it alone, otherwise we give it the desired type */ 39 40#define TC_RELOC(X,Y) (((X) != BFD_RELOC_386_PLT32 && \ 41 (X) != BFD_RELOC_386_GOTOFF && \ 42 (X) != BFD_RELOC_386_GOT32 && \ 43 (X) != BFD_RELOC_386_GOTPC) ? Y : X) 44 45#define tc_fix_adjustable(X) tc_i386_fix_adjustable(X) 46extern int tc_i386_fix_adjustable PARAMS ((struct fix *)); 47 48/* This is the relocation type for direct references to GLOBAL_OFFSET_TABLE. 49 * It comes up in complicated expressions such as 50 * _GLOBAL_OFFSET_TABLE_+[.-.L284], which cannot be expressed normally with 51 * the regular expressions. The fixup specified here when used at runtime 52 * implies that we should add the address of the GOT to the specified location, 53 * and as a result we have simplified the expression into something we can use. 54 */ 55#define TC_RELOC_GLOBAL_OFFSET_TABLE BFD_RELOC_386_GOTPC 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 69#define TARGET_ARCH bfd_arch_i386 70 71#ifdef OBJ_AOUT 72#ifdef TE_FreeBSD 73#define TARGET_FORMAT "a.out-i386-freebsd" 74#endif 75#ifdef TE_NetBSD 76#define TARGET_FORMAT "a.out-i386-netbsd" 77#endif 78#ifdef TE_386BSD 79#define TARGET_FORMAT "a.out-i386-bsd" 80#endif 81#ifdef TE_LINUX 82#define TARGET_FORMAT "a.out-i386-linux" 83#endif 84#ifdef TE_Mach 85#define TARGET_FORMAT "a.out-mach3" 86#endif 87#ifdef TE_DYNIX 88#define TARGET_FORMAT "a.out-i386-dynix" 89#endif 90#ifndef TARGET_FORMAT 91#define TARGET_FORMAT "a.out-i386" 92#endif 93#endif /* OBJ_AOUT */ 94 95#ifdef OBJ_ELF 96#define TARGET_FORMAT "elf32-i386" 97#endif 98 99#ifdef OBJ_MAYBE_ELF 100#ifdef OBJ_MAYBE_COFF 101extern const char *i386_target_format PARAMS ((void)); 102#define TARGET_FORMAT i386_target_format () 103#endif 104#endif 105 106#else /* ! BFD_ASSEMBLER */ 107 108/* COFF STUFF */ 109 110#define COFF_MAGIC I386MAGIC 111#define BFD_ARCH bfd_arch_i386 112#define COFF_FLAGS F_AR32WR 113#define TC_COUNT_RELOC(x) ((x)->fx_addsy || (x)->fx_r_type==7) 114#define TC_FORCE_RELOCATION(x) ((x)->fx_r_type==7) 115#define TC_COFF_FIX2RTYPE(fixP) tc_coff_fix2rtype(fixP) 116extern short tc_coff_fix2rtype PARAMS ((struct fix *)); 117#define TC_COFF_SIZEMACHDEP(frag) tc_coff_sizemachdep(frag) 118extern int tc_coff_sizemachdep PARAMS ((fragS *frag)); 119#define SUB_SEGMENT_ALIGN(SEG) 2 120#define TC_RVA_RELOC 7 121/* Need this for PIC relocations */ 122#define NEED_FX_R_TYPE 123 124 125#ifdef TE_386BSD 126/* The BSDI linker apparently rejects objects with a machine type of 127 M_386 (100). */ 128#define AOUT_MACHTYPE 0 129#else 130#define AOUT_MACHTYPE 100 131#endif 132 133#undef REVERSE_SORT_RELOCS 134 135#endif /* ! BFD_ASSEMBLER */ 136 137#ifdef BFD_ASSEMBLER 138#define NO_RELOC BFD_RELOC_NONE 139#else 140#define NO_RELOC 0 141#endif 142#define tc_coff_symbol_emit_hook(a) ; /* not used */ 143 144#ifndef BFD_ASSEMBLER 145#ifndef OBJ_AOUT 146#ifndef TE_PE 147/* Local labels starts with .L */ 148#define LOCAL_LABEL(name) (name[0] == '.' \ 149 && (name[1] == 'L' || name[1] == 'X' || name[1] == '.')) 150#endif 151#endif 152#endif 153 154#define LOCAL_LABELS_FB 1 155 156#define tc_aout_pre_write_hook(x) {;} /* not used */ 157#define tc_crawl_symbol_chain(a) {;} /* not used */ 158#define tc_headers_hook(a) {;} /* not used */ 159 160#define MAX_OPERANDS 3 /* max operands per insn */ 161#define MAX_PREFIXES 5 /* max prefixes per opcode */ 162#define MAX_IMMEDIATE_OPERANDS 2/* max immediates per insn */ 163#define MAX_MEMORY_OPERANDS 2 /* max memory ref per insn (lcall uses 2) */ 164 165/* we define the syntax here (modulo base,index,scale syntax) */ 166#define REGISTER_PREFIX '%' 167#define IMMEDIATE_PREFIX '$' 168#define ABSOLUTE_PREFIX '*' 169#define PREFIX_SEPERATOR '/' 170 171#define TWO_BYTE_OPCODE_ESCAPE 0x0f 172#define NOP_OPCODE (char) 0x90 173 174/* register numbers */ 175#define EBP_REG_NUM 5 176#define ESP_REG_NUM 4 177 178/* modrm_byte.regmem for twobyte escape */ 179#define ESCAPE_TO_TWO_BYTE_ADDRESSING ESP_REG_NUM 180/* index_base_byte.index for no index register addressing */ 181#define NO_INDEX_REGISTER ESP_REG_NUM 182/* index_base_byte.base for no base register addressing */ 183#define NO_BASE_REGISTER EBP_REG_NUM 184 185/* these are the att as opcode suffixes, making movl --> mov, for example */ 186#define DWORD_OPCODE_SUFFIX 'l' 187#define WORD_OPCODE_SUFFIX 'w' 188#define BYTE_OPCODE_SUFFIX 'b' 189 190/* modrm.mode = REGMEM_FIELD_HAS_REG when a register is in there */ 191#define REGMEM_FIELD_HAS_REG 0x3/* always = 0x3 */ 192#define REGMEM_FIELD_HAS_MEM (~REGMEM_FIELD_HAS_REG) 193 194#define END_OF_INSN '\0' 195 196/* 197 When an operand is read in it is classified by its type. This type includes 198 all the possible ways an operand can be used. Thus, '%eax' is both 'register 199 # 0' and 'The Accumulator'. In our language this is expressed by OR'ing 200 'Reg32' (any 32 bit register) and 'Acc' (the accumulator). 201 Operands are classified so that we can match given operand types with 202 the opcode table in i386-opcode.h. 203 */ 204#define Unknown 0x0 205/* register */ 206#define Reg8 0x1 /* 8 bit reg */ 207#define Reg16 0x2 /* 16 bit reg */ 208#define Reg32 0x4 /* 32 bit reg */ 209#define Reg (Reg8|Reg16|Reg32) /* gen'l register */ 210#define WordReg (Reg16|Reg32) /* for push/pop operands */ 211/* immediate */ 212#define Imm8 0x8 /* 8 bit immediate */ 213#define Imm8S 0x10 /* 8 bit immediate sign extended */ 214#define Imm16 0x20 /* 16 bit immediate */ 215#define Imm32 0x40 /* 32 bit immediate */ 216#define Imm1 0x80 /* 1 bit immediate */ 217#define ImmUnknown Imm32 /* for unknown expressions */ 218#define Imm (Imm8|Imm8S|Imm16|Imm32) /* gen'l immediate */ 219/* memory */ 220#define Disp8 0x200 /* 8 bit displacement (for jumps) */ 221#define Disp16 0x400 /* 16 bit displacement */ 222#define Disp32 0x800 /* 32 bit displacement */ 223#define Disp (Disp8|Disp16|Disp32) /* General displacement */ 224#define DispUnknown Disp32 /* for unknown size displacements */ 225#define Mem8 0x1000 226#define Mem16 0x2000 227#define Mem32 0x4000 228#define BaseIndex 0x8000 229#define Mem (Disp|Mem8|Mem16|Mem32|BaseIndex) /* General memory */ 230#define WordMem (Mem16|Mem32|Disp|BaseIndex) 231#define ByteMem (Mem8|Disp|BaseIndex) 232/* specials */ 233#define InOutPortReg 0x10000 /* register to hold in/out port addr = dx */ 234#define ShiftCount 0x20000 /* register to hold shift cound = cl */ 235#define Control 0x40000 /* Control register */ 236#define Debug 0x80000 /* Debug register */ 237#define Test 0x100000 /* Test register */ 238#define FloatReg 0x200000 /* Float register */ 239#define FloatAcc 0x400000 /* Float stack top %st(0) */ 240#define SReg2 0x800000 /* 2 bit segment register */ 241#define SReg3 0x1000000 /* 3 bit segment register */ 242#define Acc 0x2000000 /* Accumulator %al or %ax or %eax */ 243#define ImplicitRegister (InOutPortReg|ShiftCount|Acc|FloatAcc) 244#define JumpAbsolute 0x4000000 245#define Abs8 0x08000000 246#define Abs16 0x10000000 247#define Abs32 0x20000000 248#define Abs (Abs8|Abs16|Abs32) 249#define RegMMX 0x40000000 /* MMX register */ 250 251#define Byte (Reg8|Imm8|Imm8S) 252#define Word (Reg16|Imm16) 253#define DWord (Reg32|Imm32) 254 255#define SMALLEST_DISP_TYPE(num) \ 256 fits_in_signed_byte(num) ? (Disp8|Disp32|Abs8|Abs32) : (Disp32|Abs32) 257 258typedef struct 259{ 260 /* instruction name sans width suffix ("mov" for movl insns) */ 261 char *name; 262 263 /* how many operands */ 264 unsigned int operands; 265 266 /* base_opcode is the fundamental opcode byte with a optional prefix(es). */ 267 unsigned int base_opcode; 268 269 /* extension_opcode is the 3 bit extension for group <n> insns. 270 If this template has no extension opcode (the usual case) use None */ 271 unsigned char extension_opcode; 272#define None 0xff /* If no extension_opcode is possible. */ 273 274 /* the bits in opcode_modifier are used to generate the final opcode from 275 the base_opcode. These bits also are used to detect alternate forms of 276 the same instruction */ 277 unsigned int opcode_modifier; 278 279 /* opcode_modifier bits: */ 280#define W 0x1 /* set if operands are words or dwords */ 281#define D 0x2 /* D = 0 if Reg --> Regmem; D = 1 if Regmem --> Reg */ 282 /* direction flag for floating insns: MUST BE 0x400 */ 283#define FloatD 0x400 284 /* shorthand */ 285#define DW (D|W) 286#define ShortForm 0x10 /* register is in low 3 bits of opcode */ 287#define ShortFormW 0x20 /* ShortForm and W bit is 0x8 */ 288#define Seg2ShortForm 0x40 /* encoding of load segment reg insns */ 289#define Seg3ShortForm 0x80 /* fs/gs segment register insns. */ 290#define Jump 0x100 /* special case for jump insns. */ 291#define JumpInterSegment 0x200 /* special case for intersegment leaps/calls */ 292 /* 0x400 CANNOT BE USED since it's already used by FloatD above */ 293#define DONT_USE 0x400 294#define NoModrm 0x800 295#define Modrm 0x1000 296#define imulKludge 0x2000 297#define JumpByte 0x4000 298#define JumpDword 0x8000 299#define ReverseRegRegmem 0x10000 300#define Data16 0x20000 /* needs data prefix if in 32-bit mode */ 301#define Data32 0x40000 /* needs data prefix if in 16-bit mode */ 302#define iclrKludge 0x80000 /* used to convert clr to xor */ 303 304 /* (opcode_modifier & COMES_IN_ALL_SIZES) is true if the 305 instuction comes in byte, word, and dword sizes and is encoded into 306 machine code in the canonical way. */ 307#define COMES_IN_ALL_SIZES (W) 308 309 /* (opcode_modifier & COMES_IN_BOTH_DIRECTIONS) indicates that the 310 source and destination operands can be reversed by setting either 311 the D (for integer insns) or the FloatD (for floating insns) bit 312 in base_opcode. */ 313#define COMES_IN_BOTH_DIRECTIONS (D|FloatD) 314 315 /* operand_types[i] describes the type of operand i. This is made 316 by OR'ing together all of the possible type masks. (e.g. 317 'operand_types[i] = Reg|Imm' specifies that operand i can be 318 either a register or an immediate operand */ 319 unsigned int operand_types[3]; 320} 321template; 322 323/* 324 'templates' is for grouping together 'template' structures for opcodes 325 of the same name. This is only used for storing the insns in the grand 326 ole hash table of insns. 327 The templates themselves start at START and range up to (but not including) 328 END. 329 */ 330typedef struct 331 { 332 template *start; 333 template *end; 334 } templates; 335 336/* these are for register name --> number & type hash lookup */ 337typedef struct 338 { 339 char *reg_name; 340 unsigned int reg_type; 341 unsigned int reg_num; 342 } 343 344reg_entry; 345 346typedef struct 347 { 348 char *seg_name; 349 unsigned int seg_prefix; 350 } 351 352seg_entry; 353 354/* these are for prefix name --> prefix code hash lookup */ 355typedef struct 356 { 357 char *prefix_name; 358 unsigned char prefix_code; 359 } 360 361prefix_entry; 362 363/* 386 operand encoding bytes: see 386 book for details of this. */ 364typedef struct 365 { 366 unsigned regmem:3; /* codes register or memory operand */ 367 unsigned reg:3; /* codes register operand (or extended opcode) */ 368 unsigned mode:2; /* how to interpret regmem & reg */ 369 } 370 371modrm_byte; 372 373/* 386 opcode byte to code indirect addressing. */ 374typedef struct 375 { 376 unsigned base:3; 377 unsigned index:3; 378 unsigned scale:2; 379 } 380 381base_index_byte; 382 383/* The name of the global offset table generated by the compiler. Allow 384 this to be overridden if need be. */ 385#ifndef GLOBAL_OFFSET_TABLE_NAME 386#define GLOBAL_OFFSET_TABLE_NAME "_GLOBAL_OFFSET_TABLE_" 387#endif 388 389#ifdef BFD_ASSEMBLER 390void i386_validate_fix PARAMS ((struct fix *)); 391#define TC_VALIDATE_FIX(FIXP,SEGTYPE,SKIP) i386_validate_fix(FIXP) 392#endif 393 394#endif /* TC_I386 */ 395 396#define md_operand(x) 397 398extern const struct relax_type md_relax_table[]; 399#define TC_GENERIC_RELAX_TABLE md_relax_table 400 401 402extern int flag_16bit_code; 403 404#define md_do_align(n, fill, len, max, around) \ 405if ((n) && !need_pass_2 \ 406 && (!(fill) || ((char)*(fill) == (char)0x90 && (len) == 1)) \ 407 && now_seg != data_section && now_seg != bss_section) \ 408 { \ 409 char *p; \ 410 p = frag_var (rs_align_code, 15, 1, (relax_substateT) max, \ 411 (symbolS *) 0, (offsetT) (n), (char *) 0); \ 412 *p = 0x90; \ 413 goto around; \ 414 } 415 416extern void i386_align_code PARAMS ((fragS *, int)); 417 418#define HANDLE_ALIGN(fragP) \ 419if (fragP->fr_type == rs_align_code) \ 420 i386_align_code (fragP, (fragP->fr_next->fr_address \ 421 - fragP->fr_address \ 422 - fragP->fr_fix)); 423 424/* call md_apply_fix3 with segment instead of md_apply_fix */ 425#define MD_APPLY_FIX3 426 427void i386_print_statistics PARAMS ((FILE *)); 428#define tc_print_statistics i386_print_statistics 429 430#define md_number_to_chars number_to_chars_littleendian 431 432#ifdef SCO_ELF 433#define tc_init_after_args() sco_id () 434extern void sco_id PARAMS ((void)); 435#endif 436 437/* end of tc-i386.h */ 438