instruction.h

一个简单的虚拟机和虚拟操作系统

/*
 * operation code;
 * now 14 kinds of operation are valid,
 * however I will add more operations;
 */
#define SET      0         //allocate static data

#define LOAD     SET+1     //load data from memory to register
#define STOR     LOAD+1    //stroe data to memory from register
#define MOV      LOAD+2

#define ADD      MOV+1     //"+"
#define SUB      ADD+1     //"-"
#define MPY      ADD+2     //"*"
#define DIV      ADD+3     //"/"
#define INC      ADD+4     //"++"
#define DEC      ADD+5     //"--"

#define JMP      DEC+1     //jump
#define JPZ      JMP+1     //jump if value is 0

#define OPEN     JPZ+1     //open IO
#define CLOSE    OPEN+1    //close IO
#define _IN      OPEN+2    //input from keyboard
#define _OUT     OPEN+3    //print

#define HALT     _OUT+1    //exit the process