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retro-wertz
2017-10-15 03:13:11 +08:00
parent ebca2248d0
commit 52c8155dee
33 changed files with 441 additions and 408 deletions
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65
src/x6502.c
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@@ -66,7 +66,7 @@ static INLINE void WrMemNorm(uint32 A, uint8 V) {
}
#ifdef FCEUDEF_DEBUGGER
X6502 XSave; // This is getting ugly.
X6502 XSave; /* This is getting ugly. */
static INLINE uint8 RdMemHook(uint32 A) {
if (X.ReadHook)
@@ -110,7 +110,7 @@ void FASTAPASS(2) X6502_DMW(uint32 A, uint8 V) {
#define POP() RdRAM(0x100 + (++_S))
static uint8 ZNTable[256];
// Some of these operations will only make sense if you know what the flag constants are.
/* Some of these operations will only make sense if you know what the flag constants are. */
#define X_ZN(zort) _P &= ~(Z_FLAG | N_FLAG); _P |= ZNTable[zort]
#define X_ZNT(zort) _P |= ZNTable[zort]
@@ -134,7 +134,7 @@ static uint8 ZNTable[256];
#define LDX _X = x; X_ZN(_X)
#define LDY _Y = x; X_ZN(_Y)
// All of the freaky arithmetic operations.
/* All of the freaky arithmetic operations. */
#define AND _A &= x; X_ZN(_A)
#define BIT _P &= ~(Z_FLAG | V_FLAG | N_FLAG); _P |= ZNTable[x & _A] & Z_FLAG; _P |= x & (V_FLAG | N_FLAG)
#define EOR _A ^= x; X_ZN(_A)
@@ -165,7 +165,7 @@ static uint8 ZNTable[256];
_P |= ((t >> 8) & C_FLAG) ^ C_FLAG; \
}
// Special undocumented operation. Very similar to CMP.
/* Special undocumented operation. Very similar to CMP. */
#define AXS { \
uint32 t = (_A & _X) - x; \
X_ZN(t & 0xFF); \
@@ -178,14 +178,14 @@ static uint8 ZNTable[256];
#define CPX CMPL(_X, x)
#define CPY CMPL(_Y, x)
// The following operations modify the byte being worked on.
/* The following operations modify the byte being worked on. */
#define DEC x--; X_ZN(x)
#define INC x++; X_ZN(x)
#define ASL _P &= ~C_FLAG; _P |= x >> 7; x <<= 1; X_ZN(x)
#define LSR _P &= ~(C_FLAG | N_FLAG | Z_FLAG); _P |= x & 1; x >>= 1; X_ZNT(x)
// For undocumented instructions, maybe for other things later...
/* For undocumented instructions, maybe for other things later... */
#define LSRA _P &= ~(C_FLAG | N_FLAG | Z_FLAG); _P |= _A & 1; _A >>= 1; X_ZNT(_A)
#define ROL { \
@@ -206,10 +206,11 @@ static uint8 ZNTable[256];
X_ZNT(x); \
}
// Icky icky thing for some undocumented instructions. Can easily be
// broken if names of local variables are changed.
/* Icky icky thing for some undocumented instructions. Can easily be
* broken if names of local variables are changed.
*/
// Absolute
/* Absolute */
#define GetAB(target) { \
target = RdMem(_PC); \
_PC++; \
@@ -217,7 +218,7 @@ static uint8 ZNTable[256];
_PC++; \
}
// Absolute Indexed(for reads)
/* Absolute Indexed(for reads) */
#define GetABIRD(target, i) { \
uint32 tmp; \
GetAB(tmp); \
@@ -230,7 +231,7 @@ static uint8 ZNTable[256];
} \
}
// Absolute Indexed(for writes and rmws)
/* Absolute Indexed(for writes and rmws) */
#define GetABIWR(target, i) { \
uint32 rt; \
GetAB(rt); \
@@ -240,19 +241,19 @@ static uint8 ZNTable[256];
RdMem((target & 0x00FF) | (rt & 0xFF00)); \
}
// Zero Page
/* Zero Page */
#define GetZP(target) { \
target = RdMem(_PC); \
_PC++; \
}
// Zero Page Indexed
/* Zero Page Indexed */
#define GetZPI(target, i) { \
target = i + RdMem(_PC); \
_PC++; \
}
// Indexed Indirect
/* Indexed Indirect */
#define GetIX(target) { \
uint8 tmp; \
tmp = RdMem(_PC); \
@@ -263,7 +264,7 @@ static uint8 ZNTable[256];
target |= RdRAM(tmp) << 8; \
}
// Indirect Indexed(for reads)
/* Indirect Indexed(for reads) */
#define GetIYRD(target) { \
uint32 rt; \
uint8 tmp; \
@@ -281,7 +282,7 @@ static uint8 ZNTable[256];
} \
}
// Indirect Indexed(for writes and rmws)
/* Indirect Indexed(for writes and rmws) */
#define GetIYWR(target) { \
uint32 rt; \
uint8 tmp; \
@@ -369,7 +370,7 @@ void TriggerNMI2(void) {
}
#ifdef FCEUDEF_DEBUGGER
// Called from debugger.
/* Called from debugger. */
void FCEUI_NMI(void) {
_IRQlow |= FCEU_IQNMI;
}
@@ -427,9 +428,9 @@ static void X6502_RunDebug(int32 cycles) {
#define WrMem WrMemHook
if (PAL)
cycles *= 15; // 15*4=60
cycles *= 15; /* 15*4=60 */
else
cycles *= 16; // 16*4=64
cycles *= 16; /* 16*4=64 */
_count += cycles;
@@ -473,13 +474,15 @@ static void X6502_RunDebug(int32 cycles) {
if (_count <= 0) {
_PI = _P;
return;
} // Should increase accuracy without a
// major speed hit.
} /* Should increase accuracy without a
* major speed hit.
*/
}
if (X.CPUHook) X.CPUHook(&X);
// Ok, now the real fun starts.
// Do the pre-exec voodoo.
/* Ok, now the real fun starts.
* Do the pre-exec voodoo.
*/
if (X.ReadHook || X.WriteHook) {
uint32 tsave = timestamp;
XSave = X;
@@ -494,8 +497,9 @@ static void X6502_RunDebug(int32 cycles) {
timestamp = tsave;
// In case an NMI/IRQ/RESET was triggered by the debugger.
// Should we also copy over the other hook variables?
/* In case an NMI/IRQ/RESET was triggered by the debugger.
* Should we also copy over the other hook variables?
*/
XSave.IRQlow = X.IRQlow;
XSave.ReadHook = X.ReadHook;
XSave.WriteHook = X.WriteHook;
@@ -537,7 +541,7 @@ void X6502_Run(int32 cycles)
#define WrMem WrMemNorm
#if (defined(C80x86) && defined(__GNUC__))
// Gives a nice little speed boost.
/* Gives a nice little speed boost. */
register uint16 pbackus asm ("edi");
#else
uint16 pbackus;
@@ -549,9 +553,9 @@ void X6502_Run(int32 cycles)
#define _PC pbackus
if (PAL)
cycles *= 15; // 15*4=60
cycles *= 15; /* 15*4=60 */
else
cycles *= 16; // 16*4=64
cycles *= 16; /* 16*4=64 */
_count += cycles;
@@ -596,8 +600,9 @@ void X6502_Run(int32 cycles)
_PI = _P;
X.PC = pbackus;
return;
} // Should increase accuracy without a
// major speed hit.
} /* Should increase accuracy without a
* major speed hit.
*/
}
_PI = _P;