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more shit! some start of ALU emulation

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This commit is contained in:
StapleButter
2016-11-25 00:08:53 +01:00
parent f74fb2dd27
commit 97ec988dae
9 changed files with 733 additions and 80 deletions
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36
ARM.h
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@ -9,6 +9,9 @@
// lame
#define C_S(x) x
#define C_N(x) x
#define C_I(x) x
#define ROR(x, n) (((x) >> (n)) | ((x) << (32-(n))))
class ARM
{
@ -19,8 +22,39 @@ public:
void Reset();
void JumpTo(u32 addr);
void RestoreCPSR();
s32 Execute(s32 cycles);
bool CheckCondition(u32 code)
{
if (code == 0xE) return true;
if (ConditionTable[code] & (1 << (CPSR>>28))) return true;
return false;
}
void SetC(bool c)
{
if (c) CPSR |= 0x20000000;
else CPSR &= ~0x20000000;
}
void SetNZ(bool n, bool z)
{
CPSR &= ~0xC0000000;
if (n) CPSR |= 0x80000000;
if (z) CPSR |= 0x40000000;
}
void SetNZCV(bool n, bool z, bool c, bool v)
{
CPSR &= ~0xF0000000;
if (n) CPSR |= 0x80000000;
if (z) CPSR |= 0x40000000;
if (c) CPSR |= 0x20000000;
if (v) CPSR |= 0x10000000;
}
u32 Read32(u32 addr)
{
if (Num) return NDS::ARM7Read32(addr);
@ -41,6 +75,8 @@ public:
u32 NextInstr;
u32 ExceptionBase;
static u32 ConditionTable[16];
};
#endif // ARM_H