mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-24 11:29:10 +00:00
252 lines
8.6 KiB
C
252 lines
8.6 KiB
C
/* tc-i386.h -- Header file for tc-i386.c
|
|
Copyright (C) 1989, 1992 Free Software Foundation.
|
|
|
|
This file is part of GAS, the GNU Assembler.
|
|
|
|
GAS is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2, or (at your option)
|
|
any later version.
|
|
|
|
GAS is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with GAS; see the file COPYING. If not, write to
|
|
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
|
|
|
|
/*
|
|
* $Id$
|
|
*/
|
|
|
|
#ifndef TC_I386
|
|
#define TC_I386 1
|
|
|
|
#define AOUT_MACHTYPE 134
|
|
|
|
#define REVERSE_SORT_RELOCS
|
|
|
|
#define LOCAL_LABELS_FB
|
|
|
|
#define tc_coff_symbol_emit_hook(a) ; /* not used */
|
|
|
|
/* Local labels starts with .L */
|
|
/* fixme-now: this is for testing against old gas */
|
|
/* #define LOCAL_LABEL(name) ((name)[0] == '.' && (name)[1] == 'L') */
|
|
#define tc_aout_pre_write_hook(x) {;} /* not used */
|
|
#define tc_crawl_symbol_chain(a) {;} /* not used */
|
|
#define tc_headers_hook(a) {;} /* not used */
|
|
|
|
#define MAX_OPERANDS 3 /* max operands per insn */
|
|
#define MAX_PREFIXES 4 /* max prefixes per opcode */
|
|
#define MAX_IMMEDIATE_OPERANDS 2 /* max immediates per insn */
|
|
#define MAX_MEMORY_OPERANDS 2 /* max memory ref per insn
|
|
* lcall uses 2
|
|
*/
|
|
/* we define the syntax here (modulo base,index,scale syntax) */
|
|
#define REGISTER_PREFIX '%'
|
|
#define IMMEDIATE_PREFIX '$'
|
|
#define ABSOLUTE_PREFIX '*'
|
|
#define PREFIX_SEPERATOR '/'
|
|
|
|
#define TWO_BYTE_OPCODE_ESCAPE 0x0f
|
|
|
|
#ifndef OLD_GAS
|
|
#define NOP_OPCODE 0x90
|
|
#else /* OLD_GAS */
|
|
#define NOP_OPCODE 0x00
|
|
#endif /* OLD_GAS */
|
|
|
|
/* register numbers */
|
|
#define EBP_REG_NUM 5
|
|
#define ESP_REG_NUM 4
|
|
|
|
/* modrm_byte.regmem for twobyte escape */
|
|
#define ESCAPE_TO_TWO_BYTE_ADDRESSING ESP_REG_NUM
|
|
/* index_base_byte.index for no index register addressing */
|
|
#define NO_INDEX_REGISTER ESP_REG_NUM
|
|
/* index_base_byte.base for no base register addressing */
|
|
#define NO_BASE_REGISTER EBP_REG_NUM
|
|
|
|
/* these are the att as opcode suffixes, making movl --> mov, for example */
|
|
#define DWORD_OPCODE_SUFFIX 'l'
|
|
#define WORD_OPCODE_SUFFIX 'w'
|
|
#define BYTE_OPCODE_SUFFIX 'b'
|
|
|
|
/* modrm.mode = REGMEM_FIELD_HAS_REG when a register is in there */
|
|
#define REGMEM_FIELD_HAS_REG 0x3 /* always = 0x3 */
|
|
#define REGMEM_FIELD_HAS_MEM (~REGMEM_FIELD_HAS_REG)
|
|
|
|
#define END_OF_INSN '\0'
|
|
|
|
/*
|
|
When an operand is read in it is classified by its type. This type includes
|
|
all the possible ways an operand can be used. Thus, '%eax' is both 'register
|
|
# 0' and 'The Accumulator'. In our language this is expressed by OR'ing
|
|
'Reg32' (any 32 bit register) and 'Acc' (the accumulator).
|
|
Operands are classified so that we can match given operand types with
|
|
the opcode table in i386-opcode.h.
|
|
*/
|
|
#define Unknown 0x0
|
|
/* register */
|
|
#define Reg8 0x1 /* 8 bit reg */
|
|
#define Reg16 0x2 /* 16 bit reg */
|
|
#define Reg32 0x4 /* 32 bit reg */
|
|
#define Reg (Reg8|Reg16|Reg32) /* gen'l register */
|
|
#define WordReg (Reg16|Reg32) /* for push/pop operands */
|
|
/* immediate */
|
|
#define Imm8 0x8 /* 8 bit immediate */
|
|
#define Imm8S 0x10 /* 8 bit immediate sign extended */
|
|
#define Imm16 0x20 /* 16 bit immediate */
|
|
#define Imm32 0x40 /* 32 bit immediate */
|
|
#define Imm1 0x80 /* 1 bit immediate */
|
|
#define ImmUnknown Imm32 /* for unknown expressions */
|
|
#define Imm (Imm8|Imm8S|Imm16|Imm32) /* gen'l immediate */
|
|
/* memory */
|
|
#define Disp8 0x200 /* 8 bit displacement (for jumps) */
|
|
#define Disp16 0x400 /* 16 bit displacement */
|
|
#define Disp32 0x800 /* 32 bit displacement */
|
|
#define Disp (Disp8|Disp16|Disp32) /* General displacement */
|
|
#define DispUnknown Disp32 /* for unknown size displacements */
|
|
#define Mem8 0x1000
|
|
#define Mem16 0x2000
|
|
#define Mem32 0x4000
|
|
#define BaseIndex 0x8000
|
|
#define Mem (Disp|Mem8|Mem16|Mem32|BaseIndex) /* General memory */
|
|
#define WordMem (Mem16|Mem32|Disp|BaseIndex)
|
|
#define ByteMem (Mem8|Disp|BaseIndex)
|
|
/* specials */
|
|
#define InOutPortReg 0x10000 /* register to hold in/out port addr = dx */
|
|
#define ShiftCount 0x20000 /* register to hold shift cound = cl */
|
|
#define Control 0x40000 /* Control register */
|
|
#define Debug 0x80000 /* Debug register */
|
|
#define Test 0x100000 /* Test register */
|
|
#define FloatReg 0x200000 /* Float register */
|
|
#define FloatAcc 0x400000 /* Float stack top %st(0) */
|
|
#define SReg2 0x800000 /* 2 bit segment register */
|
|
#define SReg3 0x1000000 /* 3 bit segment register */
|
|
#define Acc 0x2000000 /* Accumulator %al or %ax or %eax */
|
|
#define ImplicitRegister (InOutPortReg|ShiftCount|Acc|FloatAcc)
|
|
#define JumpAbsolute 0x4000000
|
|
#define Abs8 0x08000000
|
|
#define Abs16 0x10000000
|
|
#define Abs32 0x20000000
|
|
#define Abs (Abs8|Abs16|Abs32)
|
|
|
|
#define Byte (Reg8|Imm8|Imm8S)
|
|
#define Word (Reg16|Imm16)
|
|
#define DWord (Reg32|Imm32)
|
|
|
|
#define SMALLEST_DISP_TYPE(num) \
|
|
fits_in_signed_byte(num) ? (Disp8|Disp32|Abs8|Abs32) : (Disp32|Abs32)
|
|
|
|
typedef struct {
|
|
/* instruction name sans width suffix ("mov" for movl insns) */
|
|
char *name;
|
|
|
|
/* how many operands */
|
|
unsigned int operands;
|
|
|
|
/* base_opcode is the fundamental opcode byte with a optional prefix(es). */
|
|
unsigned int base_opcode;
|
|
|
|
/* extension_opcode is the 3 bit extension for group <n> insns.
|
|
If this template has no extension opcode (the usual case) use None */
|
|
unsigned char extension_opcode;
|
|
#define None 0xff /* If no extension_opcode is possible. */
|
|
|
|
/* the bits in opcode_modifier are used to generate the final opcode from
|
|
the base_opcode. These bits also are used to detect alternate forms of
|
|
the same instruction */
|
|
unsigned int opcode_modifier;
|
|
|
|
/* opcode_modifier bits: */
|
|
#define W 0x1 /* set if operands are words or dwords */
|
|
#define D 0x2 /* D = 0 if Reg --> Regmem; D = 1 if Regmem --> Reg */
|
|
/* direction flag for floating insns: MUST BE 0x400 */
|
|
#define FloatD 0x400
|
|
/* shorthand */
|
|
#define DW (D|W)
|
|
#define ShortForm 0x10 /* register is in low 3 bits of opcode */
|
|
#define ShortFormW 0x20 /* ShortForm and W bit is 0x8 */
|
|
#define Seg2ShortForm 0x40 /* encoding of load segment reg insns */
|
|
#define Seg3ShortForm 0x80 /* fs/gs segment register insns. */
|
|
#define Jump 0x100 /* special case for jump insns. */
|
|
#define JumpInterSegment 0x200 /* special case for intersegment leaps/calls */
|
|
/* 0x400 CANNOT BE USED since it's already used by FloatD above */
|
|
#define DONT_USE 0x400
|
|
#define NoModrm 0x800
|
|
#define Modrm 0x1000
|
|
#define imulKludge 0x2000
|
|
#define JumpByte 0x4000
|
|
#define JumpDword 0x8000
|
|
#define ReverseRegRegmem 0x10000
|
|
|
|
/* (opcode_modifier & COMES_IN_ALL_SIZES) is true if the
|
|
instuction comes in byte, word, and dword sizes and is encoded into
|
|
machine code in the canonical way. */
|
|
#define COMES_IN_ALL_SIZES (W)
|
|
|
|
/* (opcode_modifier & COMES_IN_BOTH_DIRECTIONS) indicates that the
|
|
source and destination operands can be reversed by setting either
|
|
the D (for integer insns) or the FloatD (for floating insns) bit
|
|
in base_opcode. */
|
|
#define COMES_IN_BOTH_DIRECTIONS (D|FloatD)
|
|
|
|
/* operand_types[i] describes the type of operand i. This is made
|
|
by OR'ing together all of the possible type masks. (e.g.
|
|
'operand_types[i] = Reg|Imm' specifies that operand i can be
|
|
either a register or an immediate operand */
|
|
unsigned int operand_types[3];
|
|
} template;
|
|
|
|
/*
|
|
'templates' is for grouping together 'template' structures for opcodes
|
|
of the same name. This is only used for storing the insns in the grand
|
|
ole hash table of insns.
|
|
The templates themselves start at START and range up to (but not including)
|
|
END.
|
|
*/
|
|
typedef struct {
|
|
template *start;
|
|
template *end;
|
|
} templates;
|
|
|
|
/* these are for register name --> number & type hash lookup */
|
|
typedef struct {
|
|
char *reg_name;
|
|
unsigned int reg_type;
|
|
unsigned int reg_num;
|
|
} reg_entry;
|
|
|
|
typedef struct {
|
|
char *seg_name;
|
|
unsigned int seg_prefix;
|
|
} seg_entry;
|
|
|
|
/* these are for prefix name --> prefix code hash lookup */
|
|
typedef struct {
|
|
char *prefix_name;
|
|
unsigned char prefix_code;
|
|
} prefix_entry;
|
|
|
|
/* 386 operand encoding bytes: see 386 book for details of this. */
|
|
typedef struct {
|
|
unsigned regmem:3; /* codes register or memory operand */
|
|
unsigned reg:3; /* codes register operand (or extended opcode) */
|
|
unsigned mode:2; /* how to interpret regmem & reg */
|
|
} modrm_byte;
|
|
|
|
/* 386 opcode byte to code indirect addressing. */
|
|
typedef struct {
|
|
unsigned base:3;
|
|
unsigned index:3;
|
|
unsigned scale:2;
|
|
} base_index_byte;
|
|
|
|
#endif /* TC_I386 */
|
|
|
|
/* end of tc-i386.h */
|