armplat.cpp

#include "armplat.h"

const char* regName[8] = {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7"};

void ARM::rotateRight(unsigned int &num)
{
    num = ((num & 3) << 30) | (num >> 2);
}

bool ARM::validConst(unsigned int num)
{
    for(int i = 0; i < 16; i ++)
    {
        if(num <= 0xff) return true;
        rotateRight(num);
    }
    return false;
}

bool ARM::validConstExpr(int num)
{
    return validConst(num) || validConst(-num);
}

bool ARM::validOffset(int num)
{
    return (num > -4096 && num < 4096);
}

bool ARM::validReg(string reg)
{
    if(reg == "fp" || reg == "sp" || reg == "ip" || reg =="pc")
        return true;
    for(int i = 0; i <= 10; i ++)
    {
        stringstream ss;
        ss << i;
        string rg = "r" + ss.str();
        if(reg == rg) return true;
    }   
    return false;
}