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#include <stdio.h>
#include "NDS.h"
#include "ARM.h"
#include "ARMInterpreter.h"
u32 ARM::ConditionTable[16] =
{
0xF0F0, // EQ
0x0F0F, // NE
0xCCCC, // CS
0x3333, // CC
0xFF00, // MI
0x00FF, // PL
0xAAAA, // VS
0x5555, // VC
0x0C0C, // HI
0xF3F3, // LS
0xAA55, // GE
0x55AA, // LT
0x0A05, // GT
0xF5FA, // LE
0xFFFF, // AL
0x0000 // NE
};
ARM::ARM(u32 num)
{
// well uh
Num = num;
}
ARM::~ARM()
{
// dorp
}
void ARM::Reset()
{
for (int i = 0; i < 16; i++)
R[i] = 0;
CPSR = 0x000000D3;
ExceptionBase = Num ? 0x00000000 : 0xFFFF0000;
// zorp
JumpTo(ExceptionBase);
}
void ARM::JumpTo(u32 addr)
{
// pipeline shit
// TODO: THUMB!!
if (addr&1) printf("!!! THUMB JUMP\n");
addr &= ~3;
NextInstr = Read32(addr);
R[15] = addr+4;
}
void ARM::RestoreCPSR()
{
printf("TODO: restore CPSR\n");
}
s32 ARM::Execute(s32 cycles)
{
while (cycles > 0)
{
// TODO THUM SHIT ASGAFDGSUHAJISGFYAUISAGY
// prefetch
CurInstr = NextInstr;
NextInstr = Read32(R[15]);
R[15] += 4;
// actually execute
if (CheckCondition(CurInstr >> 28))
{
u32 icode = ((CurInstr >> 4) & 0xF) | ((CurInstr >> 16) & 0xFF0);
cycles -= ARMInterpreter::ARMInstrTable[icode](this);
}
else if ((CurInstr & 0xFE000000) == 0xFA000000)
{
cycles -= ARMInterpreter::A_BLX_IMM(this);
}
else
{
// not executing it. oh well
cycles -= 1; // 1S. todo: check
}
}
return cycles;
}
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