
/*
 * Copyright (c) 1992-1999 by Symantec
 * Copyright (c) 1999-2008 by Digital Mars
 * All Rights Reserved
 * http://www.digitalmars.com
 * Written by Mike Cote, John Micco and Walter Bright
 *
 * This source file is made available for personal use
 * only. The license is in /dmd/src/dmd/backendlicense.txt
 * or /dm/src/dmd/backendlicense.txt
 * For any other uses, please contact Digital Mars.
 */

#include <setjmp.h>

/////////////////////////////////////////////////
// Instruction flags (usFlags)
//
//

// This is for when the reg field of modregrm specifies which instruction it is
#define NUM_MASK	0x7
#define _0	(0x0 | _modrm)		// insure that some _modrm bit is set
#define _1	0x1			// with _0
#define _2	0x2
#define _3	0x3
#define _4	0x4
#define _5	0x5
#define _6	0x6
#define _7	0x7

#define	_modrm	0x10

#define _r	_modrm
#define _cb	_modrm
#define _cw	_modrm
#define _cd	_modrm
#define _cp	_modrm
#define _ib	0
#define _iw	0
#define _id	0
#define _rb	0
#define _rw	0
#define _rd	0
#define _16_bit	0x20
#define _32_bit	0x40
#define _I386	0x80		// opcode is only for 386 and later
#define _16_bit_addr	0x100
#define _32_bit_addr	0x200
#define _fwait 0x400	// Add an FWAIT prior to the instruction opcode
#define _nfwait 0x800	// Do not add an FWAIT prior to the instruction

#define MOD_MASK	0xF000	// Mod mask
#define _modsi		0x1000	// Instruction modifies SI
#define _moddx		0x2000	// Instruction modifies DX
#define _mod2		0x3000	// Instruction modifies second operand
#define _modax		0x4000	// Instruction modifies AX
#define _modnot1	0x5000	// Instruction does not modify first operand
#define _modaxdx	0x6000	// instruction modifies AX and DX
#define _moddi		0x7000	// Instruction modifies DI
#define _modsidi	0x8000	// Instruction modifies SI and DI
#define _modcx		0x9000	// Instruction modifies CX
#define _modes		0xa000	// Instruction modifies ES
#define _modall		0xb000	// Instruction modifies all register values
#define _modsiax	0xc000	// Instruction modifies AX and SI
#define _modsinot1	0xd000	// Instruction modifies SI and not first param

/////////////////////////////////////////////////
// Operand flags - usOp1, usOp2, usOp3
//

typedef unsigned short opflag_t;

// Operand flags for normal opcodes

#define	_r8	CONSTRUCT_FLAGS( _8, _reg, _normal, 0 )
#define	_r16	CONSTRUCT_FLAGS(_16, _reg, _normal, 0 )
#define	_r32	CONSTRUCT_FLAGS(_32, _reg, _normal, 0 )
#define _m8	CONSTRUCT_FLAGS(_8, _m, _normal, 0 )
#define _m16	CONSTRUCT_FLAGS(_16, _m, _normal, 0 )
#define _m32	CONSTRUCT_FLAGS(_32, _m, _normal, 0 )
#define _m48	CONSTRUCT_FLAGS( _48, _m, _normal, 0 )
#define _m64	CONSTRUCT_FLAGS( _anysize, _m, _normal, 0 )
#define _m128	CONSTRUCT_FLAGS( _anysize, _m, _normal, 0 )
#define	_rm8	CONSTRUCT_FLAGS(_8, _rm, _normal, 0 )
#define _rm16	CONSTRUCT_FLAGS(_16, _rm, _normal, 0 )
#define _rm32	CONSTRUCT_FLAGS(_32, _rm, _normal, 0)
#define _r32m16	CONSTRUCT_FLAGS(_32|_16, _rm, _normal, 0)
#define	_imm8	CONSTRUCT_FLAGS(_8, _imm, _normal, 0 )
#define	_imm16	CONSTRUCT_FLAGS(_16, _imm, _normal, 0)
#define	_imm32	CONSTRUCT_FLAGS(_32, _imm, _normal, 0)
#define _rel8	CONSTRUCT_FLAGS(_8, _rel, _normal, 0)
#define _rel16	CONSTRUCT_FLAGS(_16, _rel, _normal, 0)
#define _rel32	CONSTRUCT_FLAGS(_32, _rel, _normal, 0)
#define _p1616	CONSTRUCT_FLAGS(_32, _p, _normal, 0)
#define _m1616  CONSTRUCT_FLAGS(_32, _mnoi, _normal, 0)
#define _p1632	CONSTRUCT_FLAGS(_48, _p, _normal, 0 )
#define _m1632	CONSTRUCT_FLAGS(_48, _mnoi, _normal, 0)
#define _special  CONSTRUCT_FLAGS( 0, 0, _rspecial, 0 )
#define _seg	CONSTRUCT_FLAGS( 0, 0, _rseg, 0 )
#define _a16	CONSTRUCT_FLAGS( 0, 0, _addr16, 0 )
#define _a32	CONSTRUCT_FLAGS( 0, 0, _addr32, 0 )
#define _f16	CONSTRUCT_FLAGS( 0, 0, _fn16, 0)
						// Near function pointer
#define _f32	CONSTRUCT_FLAGS( 0, 0, _fn32, 0)
						// Far function pointer
#define _lbl	CONSTRUCT_FLAGS( 0, 0, _flbl, 0 )
						// Label (in current function)

#define _mmm32	CONSTRUCT_FLAGS( 0, _m, 0, _32)
#define _mmm64	CONSTRUCT_FLAGS( 0, _m, 0, _64)
#define _mmm128	CONSTRUCT_FLAGS( 0, _m, 0, _128)

#define _xmm_m32 CONSTRUCT_FLAGS( _32, _m, _rspecial, 0)
#define _xmm_m64 CONSTRUCT_FLAGS( _anysize, _m, _rspecial, 0)
#define _xmm_m128 CONSTRUCT_FLAGS( _anysize, _m, _rspecial, 0)

#define _moffs8	(_rel8)
#define _moffs16 (_rel16 )
#define _moffs32 (_rel32 )


////////////////////////////////////////////////////////////////////
// Operand flags for floating point opcodes are all just aliases for
// normal opcode variants and only asm_determine_operator_flags should
// need to care.
//
#define _fm80	CONSTRUCT_FLAGS( 0, _m, 0, _80 )
#define _fm64	CONSTRUCT_FLAGS( 0, _m, 0, _64 )
#define _fm128	CONSTRUCT_FLAGS( 0, _m, 0, _128 )
#define _fanysize (_64 | _80 | _112 | _224)

#define _float_m CONSTRUCT_FLAGS( _anysize, _float, 0, _fanysize)

#define _st	CONSTRUCT_FLAGS( 0, _float, 0, _rst )	// stack register 0
#define _m112	CONSTRUCT_FLAGS( 0, _m, 0, _112 )
#define _m224	CONSTRUCT_FLAGS( 0, _m, 0, _224 )
#define _m512	_m224
#define _sti	CONSTRUCT_FLAGS( 0, _float, 0, _rsti )

////////////////// FLAGS /////////////////////////////////////

#define CONSTRUCT_FLAGS( uSizemask, aopty, amod, uRegmask ) \
    ( (uSizemask) | (aopty) << 4 | (amod) << 7 | (uRegmask) << 10)

#define ASM_GET_uSizemask(us)	((us) & 0x0F)
#define ASM_GET_aopty(us)	((ASM_OPERAND_TYPE)(((us) & 0x70) >> 4))
#define ASM_GET_amod(us)	((ASM_MODIFIERS)(((us) & 0x380) >> 7))
#define ASM_GET_uRegmask(us)	(((us) & 0xFC00) >> 10)


// For uSizemask (4 bits)
#define _8  0x1
#define _16 0x2
#define _32 0x4
#define _48 0x8
#define _anysize (_8 | _16 | _32 | _48 )

// For aopty (3 bits)
enum ASM_OPERAND_TYPE {
    _reg,	    // _r8, _r16, _r32
    _m,		    // _m8, _m16, _m32, _m48
    _imm,	    // _imm8, _imm16, _imm32
    _rel,	    // _rel8, _rel16, _rel32
    _mnoi,	    // _m1616, _m1632
    _p,		    // _p1616, _p1632
    _rm,	    // _rm8, _rm16, _rm32
    _float	    // Floating point operand, look at cRegmask for the
		    // actual size
};

// For amod (3 bits)
enum ASM_MODIFIERS {
    _normal,	    // Normal register value
    _rseg,	    // Segment registers
    _rspecial,	    // Special registers
    _addr16,	    // 16 bit address
    _addr32,	    // 32 bit address
    _fn16,	    // 16 bit function call
    _fn32,	    // 32 bit function call
    _flbl	    // Label
};

// For uRegmask (6 bits)

// uRegmask flags when aopty == _float
#define _rst	0x1
#define _rsti	0x2
#define	_64	0x4
#define _80	0x8
#define _128	0x40
#define _112	0x10
#define _224	0x20

// _seg register values (amod == _rseg)
//
#define _ds	CONSTRUCT_FLAGS( 0, 0, _rseg, 0x01 )
#define _es	CONSTRUCT_FLAGS( 0, 0, _rseg, 0x02 )
#define _ss	CONSTRUCT_FLAGS( 0, 0, _rseg, 0x04 )
#define _fs	CONSTRUCT_FLAGS( 0, 0, _rseg, 0x08 )
#define _gs	CONSTRUCT_FLAGS( 0, 0, _rseg, 0x10 )
#define _cs	CONSTRUCT_FLAGS( 0, 0, _rseg, 0x20 )

//
// _special register values
//
#define _crn	CONSTRUCT_FLAGS( 0, 0, _rspecial, 0x01 ) // CRn register (0,2,3)
#define _drn	CONSTRUCT_FLAGS( 0, 0, _rspecial, 0x02 ) // DRn register (0-3,6-7)
#define _trn	CONSTRUCT_FLAGS( 0, 0, _rspecial, 0x04 ) // TRn register (3-7)
#define _mm	CONSTRUCT_FLAGS( 0, 0, _rspecial, 0x08 ) // MMn register (0-7)
#define _xmm	CONSTRUCT_FLAGS( 0, 0, _rspecial, 0x10 ) // XMMn register (0-7)

//
// Default register values
//

#define	_al	CONSTRUCT_FLAGS( 0, 0, _normal, 0x01 )	// AL register
#define _ax	CONSTRUCT_FLAGS( 0, 0, _normal, 0x02 )	// AX register
#define _eax	CONSTRUCT_FLAGS( 0, 0, _normal, 0x04 )	// EAX register
#define _dx	CONSTRUCT_FLAGS( 0, 0, _normal, 0x08 )	// DX register
#define _cl	CONSTRUCT_FLAGS( 0, 0, _normal, 0x10 )	// CL register

#define _rplus_r	0x20
#define _plus_r	CONSTRUCT_FLAGS( 0, 0, 0, _rplus_r )
		// Add the register to the opcode (no mod r/m)

    

//////////////////////////////////////////////////////////////////

#define ITprefix	0x10	// special prefix
#define ITjump		0x20	// jump instructions CALL, Jxx and LOOPxx
#define ITimmed		0x30	// value of an immediate operand controls
				// code generation
#define ITopt		0x40	// not all operands are required
#define ITshift		0x50	// rotate and shift instructions
#define ITfloat		0x60	// floating point coprocessor instructions
#define	ITdata		0x70	// DB, DW, DD, DQ, DT pseudo-ops
#define ITaddr		0x80	// DA (define addresss) pseudo-op
#define ITMASK		0xF0
#define ITSIZE		0x0F	// mask for size

enum OP_DB
{
#if SCPP
    // These are the number of bytes
    OPdb = 1,
    OPdw = 2,
    OPdd = 4,
    OPdq = 8,
    OPdt = 10,
    OPdf = 4,
    OPde = 10,
    OPds = 2,
    OPdi = 4,
    OPdl = 8,
#endif
#if MARS
    // Integral types
    OPdb,
    OPds,
    OPdi,
    OPdl,

    // Float types
    OPdf,
    OPdd,
    OPde,

    // Deprecated
    OPdw = OPds,
    OPdq = OPdl,
    OPdt = OPde,
#endif
};


/* from iasm.c */
int asm_state(int iFlags);

void asm_process_fixup( block **ppblockLabels );

typedef struct _PTRNTAB3 {
	unsigned usOpcode;
	unsigned short usFlags;
	opflag_t usOp1;
	opflag_t usOp2;
	opflag_t usOp3;
} PTRNTAB3, * PPTRNTAB3, ** PPPTRNTAB3;

typedef struct _PTRNTAB2 {
	unsigned usOpcode;
	unsigned short usFlags;
	opflag_t usOp1;
	opflag_t usOp2;
} PTRNTAB2, * PPTRNTAB2, ** PPPTRNTAB2;

typedef struct _PTRNTAB1 {
	unsigned usOpcode;
	unsigned short usFlags;
	opflag_t usOp1;
} PTRNTAB1, * PPTRNTAB1, ** PPPTRNTAB1;

typedef struct _PTRNTAB0 {
	unsigned usOpcode;
	#define ASM_END	0xffff		// special opcode meaning end of table
	unsigned short usFlags;
} PTRNTAB0, * PPTRNTAB0, ** PPPTRNTAB0;

typedef union _PTRNTAB {
	PTRNTAB0	*pptb0;
	PTRNTAB1	*pptb1;
	PTRNTAB2	*pptb2;
	PTRNTAB3	*pptb3;
} PTRNTAB, * PPTRNTAB, ** PPPTRNTAB;

typedef struct 
{
	unsigned char usNumops;
	PTRNTAB	ptb;
} OP;

