optab.c

这是一个同样来自贝尔实验室的和UNIX有着渊源的操作系统, 其简洁的设计和实现易于我们学习和理解

#include	"l.h"

uchar	ynone[] =
{
	Ynone,	Ynone,	Zlit,	1,
	0
};
uchar	ytext[] =
{
	Ymb,	Yi32,	Zpseudo,1,
	0
};
uchar	ynop[] =
{
	Ynone,	Ynone,	Zpseudo,1,
	Ynone,	Yml,	Zpseudo,1,
	Ynone,	Yrf,	Zpseudo,1,
	Yml,	Ynone,	Zpseudo,1,
	Yrf,	Ynone,	Zpseudo,1,
	0
};
uchar	yxorb[] =
{
	Yi32,	Yal,	Zib_,	1,
	Yi32,	Ymb,	Zibo_m,	2,
	Yrb,	Ymb,	Zr_m,	1,
	Ymb,	Yrb,	Zm_r,	1,
	0
};
uchar	yxorl[] =
{
	Yi8,	Yml,	Zibo_m,	2,
	Yi32,	Yax,	Zil_,	1,
	Yi32,	Yml,	Zilo_m,	2,
	Yrl,	Yml,	Zr_m,	1,
	Yml,	Yrl,	Zm_r,	1,
	0
};
uchar	yaddl[] =
{
	Yi8,	Yml,	Zibo_m,	2,
	Yi32,	Yax,	Zil_,	1,
	Yi32,	Yml,	Zilo_m,	2,
	Yrl,	Yml,	Zr_m,	1,
	Yml,	Yrl,	Zm_r,	1,
	0
};
uchar	yincb[] =
{
	Ynone,	Ymb,	Zo_m,	2,
	0
};
uchar	yincl[] =
{
	Ynone,	Yrl,	Z_rp,	1,
	Ynone,	Yml,	Zo_m,	2,
	0
};
uchar	ycmpb[] =
{
	Yal,	Yi32,	Z_ib,	1,
	Ymb,	Yi32,	Zm_ibo,	2,
	Ymb,	Yrb,	Zm_r,	1,
	Yrb,	Ymb,	Zr_m,	1,
	0
};
uchar	ycmpl[] =
{
	Yml,	Yi8,	Zm_ibo,	2,
	Yax,	Yi32,	Z_il,	1,
	Yml,	Yi32,	Zm_ilo,	2,
	Yml,	Yrl,	Zm_r,	1,
	Yrl,	Yml,	Zr_m,	1,
	0
};
uchar	yshb[] =
{
	Yi1,	Ymb,	Zo_m,	2,
	Yi32,	Ymb,	Zibo_m,	2,
	Ycx,	Ymb,	Zo_m,	2,
	0
};
uchar	yshl[] =
{
	Yi1,	Yml,	Zo_m,	2,
	Yi32,	Yml,	Zibo_m,	2,
	Ycl,	Yml,	Zo_m,	2,
	Ycx,	Yml,	Zo_m,	2,
	0
};
uchar	ytestb[] =
{
	Yi32,	Yal,	Zib_,	1,
	Yi32,	Ymb,	Zibo_m,	2,
	Yrb,	Ymb,	Zr_m,	1,
	Ymb,	Yrb,	Zm_r,	1,
	0
};
uchar	ytestl[] =
{
	Yi32,	Yax,	Zil_,	1,
	Yi32,	Yml,	Zilo_m,	2,
	Yrl,	Yml,	Zr_m,	1,
	Yml,	Yrl,	Zm_r,	1,
	0
};
uchar	ymovb[] =
{
	Yrb,	Ymb,	Zr_m,	1,
	Ymb,	Yrb,	Zm_r,	1,
	Yi32,	Yrb,	Zib_rp,	1,
	Yi32,	Ymb,	Zibo_m,	2,
	0
};
uchar	ymovl[] =
{
	Yrl,	Yml,	Zr_m,	1,
	Yml,	Yrl,	Zm_r,	1,
	Yi0,	Yrl,	Zclr,	1+2,
//	Yi0,	Yml,	Zibo_m,	2,	// shorter but slower AND $0,dst
	Yi32,	Yrl,	Zil_rp,	1,
	Yi32,	Yml,	Zilo_m,	2,
	Yiauto,	Yrl,	Zaut_r,	2,
	0
};
uchar	ym_rl[] =
{
	Ym,	Yrl,	Zm_r,	1,
	0
};
uchar	yrl_m[] =
{
	Yrl,	Ym,	Zr_m,	1,
	0
};
uchar	ymb_rl[] =
{
	Ymb,	Yrl,	Zm_r,	1,
	0
};
uchar	yml_rl[] =
{
	Yml,	Yrl,	Zm_r,	1,
	0
};
uchar	yrl_ml[] =
{
	Yrl,	Yml,	Zr_m,	1,
	0
};
uchar	yml_mb[] =
{
	Yrb,	Ymb,	Zr_m,	1,
	Ymb,	Yrb,	Zm_r,	1,
	0
};
uchar	yml_ml[] =
{
	Yrl,	Yml,	Zr_m,	1,
	Yml,	Yrl,	Zm_r,	1,
	0
};
uchar	ydivl[] =
{
	Yml,	Ynone,	Zm_o,	2,
	0
};
uchar	ydivb[] =
{
	Ymb,	Ynone,	Zm_o,	2,
	0
};
uchar	yimul[] =
{
	Yml,	Ynone,	Zm_o,	2,
	Yi8,	Yrl,	Zib_rr,	1,
	Yi32,	Yrl,	Zil_rr,	1,
	0
};
uchar	ybyte[] =
{
	Yi32,	Ynone,	Zbyte,	1,
	0
};
uchar	yin[] =
{
	Yi32,	Ynone,	Zib_,	1,
	Ynone,	Ynone,	Zlit,	1,
	0
};
uchar	yint[] =
{
	Yi32,	Ynone,	Zib_,	1,
	0
};
uchar	ypushl[] =
{
	Yrl,	Ynone,	Zrp_,	1,
	Ym,	Ynone,	Zm_o,	2,
	Yi8,	Ynone,	Zib_,	1,
	Yi32,	Ynone,	Zil_,	1,
	0
};
uchar	ypopl[] =
{
	Ynone,	Yrl,	Z_rp,	1,
	Ynone,	Ym,	Zo_m,	2,
	0
};
uchar	yscond[] =
{
	Ynone,	Ymb,	Zo_m,	2,
	0
};
uchar	yjcond[] =
{
	Ynone,	Ybr,	Zbr,	1,
	0
};
uchar	yloop[] =
{
	Ynone,	Ybr,	Zloop,	1,
	0
};
uchar	ycall[] =
{
	Ynone,	Yml,	Zo_m,	2,
	Ynone,	Ybr,	Zcall,	1,
	0
};
uchar	yjmp[] =
{
	Ynone,	Yml,	Zo_m,	2,
	Ynone,	Ybr,	Zjmp,	1,
	0
};

uchar	yfmvd[] =
{
	Ym,	Yf0,	Zm_o,	2,
	Yf0,	Ym,	Zo_m,	2,
	Yrf,	Yf0,	Zm_o,	2,
	Yf0,	Yrf,	Zo_m,	2,
	0
};
uchar	yfmvdp[] =
{
	Yf0,	Ym,	Zo_m,	2,
	Yf0,	Yrf,	Zo_m,	2,
	0
};
uchar	yfmvf[] =
{
	Ym,	Yf0,	Zm_o,	2,
	Yf0,	Ym,	Zo_m,	2,
	0
};
uchar	yfmvx[] =
{
	Ym,	Yf0,	Zm_o,	2,
	0
};
uchar	yfmvp[] =
{
	Yf0,	Ym,	Zo_m,	2,
	0
};
uchar	yfadd[] =
{
	Ym,	Yf0,	Zm_o,	2,
	Yrf,	Yf0,	Zm_o,	2,
	Yf0,	Yrf,	Zo_m,	2,
	0
};
uchar	yfaddp[] =
{
	Yf0,	Yrf,	Zo_m,	2,
	0
};
uchar	yfxch[] =
{
	Yf0,	Yrf,	Zo_m,	2,
	Yrf,	Yf0,	Zm_o,	2,
	0
};
uchar	ycompp[] =
{
	Yf0,	Yrf,	Zo_m,	2,	/* botch is really f0,f1 */
	0
};
uchar	ystsw[] =
{
	Ynone,	Ym,	Zo_m,	2,
	Ynone,	Yax,	Zlit,	1,
	0
};
uchar	ystcw[] =
{
	Ynone,	Ym,	Zo_m,	2,
	Ym,	Ynone,	Zm_o,	2,
	0
};
uchar	ysvrs[] =
{
	Ynone,	Ym,	Zo_m,	2,
	Ym,	Ynone,	Zm_o,	2,
	0
};

Optab optab[] =
/*	as, ytab, andproto, opcode */
{
	{ AXXX },
	{ AAAA,		ynone,	Px, 0x37 },
	{ AAAD,		ynone,	Px, 0xd5,0x0a },
	{ AAAM,		ynone,	Px, 0xd4,0x0a },
	{ AAAS,		ynone,	Px, 0x3f },
	{ AADCB,	yxorb,	Pb, 0x14,0x80,(02),0x10,0x10 },
	{ AADCL,	yxorl,	Px, 0x83,(02),0x15,0x81,(02),0x11,0x13 },
	{ AADCW,	yxorl,	Pe, 0x83,(02),0x15,0x81,(02),0x11,0x13 },
	{ AADDB,	yxorb,	Px, 0x04,0x80,(00),0x00,0x02 },
	{ AADDL,	yaddl,	Px, 0x83,(00),0x05,0x81,(00),0x01,0x03 },
	{ AADDW,	yaddl,	Pe, 0x83,(00),0x05,0x81,(00),0x01,0x03 },
	{ AADJSP },
	{ AANDB,	yxorb,	Pb, 0x24,0x80,(04),0x20,0x22 },
	{ AANDL,	yxorl,	Px, 0x83,(04),0x25,0x81,(04),0x21,0x23 },
	{ AANDW,	yxorl,	Pe, 0x83,(04),0x25,0x81,(04),0x21,0x23 },
	{ AARPL,	yrl_ml,	Px, 0x63 },