File : ncpu.S
Authors : FCA author
modified and adapted by Yoyo.
- adapted for fceu by notaz, 2007.
+ timing fixed, missing opcodes added
+ and adapted for fceu by notaz, 2007.
**************************************/
#include "ncpu.h"
+/* emulate (some) dummy reads (may need that because they affect open bus) */
+#define DO_DUMMY_READS 1
+
@@@
@@@ Offets from REG_OP_TABLE
@@@
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@@@ $nnnn, X
.macro ABSX_ADDR
- ABS_ADDR 1
+ ABS_ADDR DO_DUMMY_READS
add REG_ADDR, REG_ADDR, REG_X
bic REG_ADDR, REG_ADDR, #0x10000
and r0,REG_ADDR,#0xff
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@@@ $nnnn, Y
.macro ABSY_ADDR
- ABS_ADDR 1 @ a hack needed for Paperboy, Dirty Harry controls to work
+ ABS_ADDR DO_DUMMY_READS @ a hack needed for Paperboy, Dirty Harry controls to work
add REG_ADDR, REG_ADDR, REG_Y
bic REG_ADDR, REG_ADDR, #0x10000
and r0,REG_ADDR,#0xff
opD8: @ CLD
IMPLIED
- @@bic REG_P_REST, REG_P_REST, #P_REST_D_FLAG
+ bic REG_P_REST, REG_P_REST, #P_REST_D_FLAG
CYCLE_NEXT 2
opF8: @ SED
IMPLIED
- @@orr REG_P_REST, REG_P_REST, #P_REST_D_FLAG
+ orr REG_P_REST, REG_P_REST, #P_REST_D_FLAG
CYCLE_NEXT 2
op58: @ CLI
and r0, r0, #0xFF
.endm
-.macro OP_SHY
- mov r0,REG_ADDR, lsr #8
- add r0,r0,#1
- and r0,r0,REG_Y
-.endm
-
.macro OP_SRE
movs r0, r0, lsr #1
@@set C flag
@@ ¥¥ã¥ê¡¼¤òÊݸ
adc REG_P_REST, r1, r1
and REG_A,REG_A,r0,lsl #24
+ orr REG_NZ, REG_A, REG_A, lsr #24 @ according to fceu
.endm
-.macro OP_RRA
- movs r1, REG_P_REST, lsr #1
- orrcs r0, r0, #0x100
- movs r0, r0, lsr #1
-.endm
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
op5F: @ SRE $nnnn, X
CYCLE_PRE 7
- ABSX_ADDR
+ ABSX_ADDR_W
READ_WRITE_1
OP_SRE
READ_WRITE_2
op5B: @ SRE $nnnn, Y
CYCLE_PRE 7
- ABSY_ADDR
+ ABSY_ADDR_W
READ_WRITE_1
OP_SRE
READ_WRITE_2
CYCLE_NEXT 8,1,0
-op9C: @ SHY $nnnn, X
- CYCLE_PRE 5
- ABSX_ADDR_W
- OP_SHY
- WRITE_1
- CYCLE_NEXT 5,1,0
-
opE7: @ ISB $nn
ZERO_ADDR
ZP_READ_W
opFF: @ ISB $nnnn,X
CYCLE_PRE 7
- ABSX_ADDR
+ ABSX_ADDR_W
READ_WRITE_1
OP_ISB
READ_WRITE_2
opFB: @ ISB $nnnn, Y
CYCLE_PRE 7
- ABSY_ADDR
+ ABSY_ADDR_W
READ_WRITE_1
OP_ISB
READ_WRITE_2
CYCLE_NEXT 7,1,0
opE3: @ ISB ($nn, X)
- CYCLE_PRE 7
+ CYCLE_PRE 8
INDX_ADDR
READ_WRITE_1
OP_ISB
READ_WRITE_2
OP_SBC
- CYCLE_NEXT 7,1,0
+ CYCLE_NEXT 8,1,0
READ_WRITE_3
OP_ISB
READ_WRITE_4
OP_SBC
- CYCLE_NEXT 7,1,0
+ CYCLE_NEXT 8,1,0
opF3: @ ISB ($nn), Y
- CYCLE_PRE 7
+ CYCLE_PRE 8
INDY_ADDR
READ_WRITE_1
OP_ISB
READ_WRITE_2
OP_SBC
- CYCLE_NEXT 7,1,0
+ CYCLE_NEXT 8,1,0
READ_WRITE_3
OP_ISB
READ_WRITE_4
OP_SBC
- CYCLE_NEXT 7,1,0
+ CYCLE_NEXT 8,1,0
opA7: @ LAX $nn
ZERO_ADDR
op1F: @ SLO $nnnn, X
CYCLE_PRE 7
- ABSX_ADDR
+ ABSX_ADDR_W
READ_WRITE_1
OP_SLO
READ_WRITE_2
opDF: @ DCP $nnnn, X
CYCLE_PRE 7
- ABSX_ADDR
+ ABSX_ADDR_W
READ_WRITE_1
OP_DCP
READ_WRITE_2
opDB: @ DCP $nnnn, Y
CYCLE_PRE 7
- ABSY_ADDR
+ ABSY_ADDR_W
READ_WRITE_1
OP_DCP
READ_WRITE_2
opD3: @ DCP ($nn), Y
CYCLE_PRE 8
- INDY_ADDR
+ INDY_ADDR_W
READ_WRITE_1
OP_DCP
READ_WRITE_2
op67: @ RRA $nn
ZERO_ADDR
ZP_READ_W
- OP_RRA
+ OP_ROR
ZP_WRITE_W
OP_ADC
CYCLE_NEXT 5
op77: @ RRA $nn, X
ZEROX_ADDR
ZP_READ_W
- OP_RRA
+ OP_ROR
ZP_WRITE_W
OP_ADC
CYCLE_NEXT 6
CYCLE_PRE 6
ABS_ADDR
READ_WRITE_1
- OP_RRA
+ OP_ROR
READ_WRITE_2
OP_ADC
CYCLE_NEXT 6,1,0
READ_WRITE_3
- OP_RRA
+ OP_ROR
READ_WRITE_4
OP_ADC
CYCLE_NEXT 6,1,0
CYCLE_PRE 7
ABSX_ADDR_W
READ_WRITE_1
- OP_RRA
+ OP_ROR
READ_WRITE_2
OP_ADC
CYCLE_NEXT 7,1,0
READ_WRITE_3
- OP_RRA
+ OP_ROR
READ_WRITE_4
OP_ADC
CYCLE_NEXT 7,1,0
CYCLE_PRE 7
ABSY_ADDR_W
READ_WRITE_1
- OP_RRA
+ OP_ROR
READ_WRITE_2
OP_ADC
CYCLE_NEXT 7,1,0
READ_WRITE_3
- OP_RRA
+ OP_ROR
READ_WRITE_4
OP_ADC
CYCLE_NEXT 7,1,0
CYCLE_PRE 8
INDX_ADDR
READ_WRITE_1
- OP_RRA
+ OP_ROR
READ_WRITE_2
OP_ADC
CYCLE_NEXT 8,1,0
READ_WRITE_3
- OP_RRA
+ OP_ROR
READ_WRITE_4
OP_ADC
CYCLE_NEXT 8,1,0
CYCLE_PRE 8
INDY_ADDR_W
READ_WRITE_1
- OP_RRA
+ OP_ROR
READ_WRITE_2
OP_ADC
CYCLE_NEXT 8,1,0
READ_WRITE_3
- OP_RRA
+ OP_ROR
READ_WRITE_4
OP_ADC
CYCLE_NEXT 8,1,0
CYCLE_NEXT 3
op0C: @ NOP $nnnn
+ CYCLE_PRE 4
+#if DO_DUMMY_READS
+ ABS_ADDR
+ READ
+#else
add REG_PC,REG_PC,#2
- CYCLE_NEXT 4
+#endif
+ CYCLE_NEXT 4,1,0
op14: @ NOP $nn, X
op34:
op7C:
opDC:
opFC:
+ CYCLE_PRE 4
+#if DO_DUMMY_READS
+ ABSX_ADDR
+ READ
+#else
add REG_PC,REG_PC,#2
- CYCLE_NEXT 4
+#endif
+ CYCLE_NEXT 4,1,0
op80: @ NOP #$nn
op82:
op89:
opC2:
+ add REG_PC,REG_PC,#1
+ CYCLE_NEXT 2
+
opE2:
add REG_PC,REG_PC,#1
+ CYCLE_NEXT 3
+
+op02: @ JAM: try to be compatible with fceu
+op12:
+op22:
+op32:
+op42:
+op52:
+op62:
+op72:
+op92:
+opB2:
+opD2:
+opF2:
+ sub REG_PC,REG_PC,#1
+ add REG_CYCLE, REG_CYCLE, #0x10
+ FLUSH_TIMESTAMP r0
+ add REG_CYCLE, REG_CYCLE, #0xef
+ sub REG_CYCLE, REG_CYCLE, #0x00d00000 @ 0xff*48<<16
+ sub REG_CYCLE, REG_CYCLE, #0x2f000000
+ CYCLE_NEXT 2
+
+op0B: @ ANC #$nn
+op2B: @ ANC #$nn
+ IMM_VALUE
+ OP_AND
+ bic REG_P_REST, REG_P_REST, #P_REST_C_FLAG
+ orr REG_P_REST, REG_P_REST, REG_A, lsr #31
+ CYCLE_NEXT 2
+
+op4B: @ ASR #$nn
+ IMM_VALUE
+ OP_AND
+ OP_LSR_A
+ CYCLE_NEXT 2
+
+op6B: @ ARR #$nn
+ IMM_VALUE
+ OP_AND
+ bic REG_P_REST, REG_P_REST, #P_REST_C_FLAG
+ eor r0, REG_A, REG_A, lsr #1
+ and r0, r0, #0x40000000
+ orr REG_P_REST, REG_P_REST, r0, lsr #24
+ OP_ROR_A
CYCLE_NEXT 2
+op83: @ SAX/AAX ($nn, X)
+ CYCLE_PRE 6
+ INDX_ADDR
+ and r0, REG_X, REG_A, lsr #24
+ WRITE_1
+ CYCLE_NEXT 6,1,0
+
+op87: @ SAX/AAX $nn
+ ZERO_ADDR
+ and r0, REG_X, REG_A, lsr #24
+ ZP_WRITE
+ CYCLE_NEXT 3
+
+op8B: @ ANE/XAA #$nn
+ orr REG_A, REG_A, #0xee000000
+ and REG_A, REG_A, REG_X, lsl #24
+ IMM_VALUE
+ OP_AND
+ CYCLE_NEXT 2
+
+op8F: @ SAX/AAX $nnnn
+ CYCLE_PRE 4
+ ABS_ADDR
+ and r0, REG_X, REG_A, lsr #24
+ WRITE_1
+ CYCLE_NEXT 4,1,0
+
+.macro AMY_MSB
+ sub r0, REG_ADDR, REG_Y
+ mov r0, r0, lsr #8
+ add r0, r0, #1
+.endm
+
+op93: @ SHA/AXA ($nn), Y
+ CYCLE_PRE 6
+ INDY_ADDR_W
+ AMY_MSB
+ and r0, r0, REG_X
+ and r0, r0, REG_A, lsr #24
+ WRITE_1
+ CYCLE_NEXT 6,1,0
+
+op97: @ SAX,AAX $nn, Y
+ ZEROY_ADDR
+ and r0, REG_X, REG_A, lsr #24
+ ZP_WRITE
+ CYCLE_NEXT 4
+
+op9B: @ SHS/XAS $nnnn, Y
+ and r0, REG_X, REG_A, lsr #24
+ bic REG_S, REG_S, #0xFF << 24
+ orr REG_S, REG_S, r0, lsl #24
+ ABSY_ADDR_W
+ AMY_MSB
+ and r0, r0, REG_S, lsr #24
+ WRITE_1
+ CYCLE_NEXT 5
+
+op9C: @ SHY/SYA $nnnn, X
+ CYCLE_PRE 5
+ ABSX_ADDR_W
+ sub r0, REG_ADDR, REG_X
+ mov r0, r0, lsr #8
+ add r0, r0, #1
+ and r0, r0, REG_Y
+ WRITE_1
+ CYCLE_NEXT 5,1,0
+
+op9E: @ SHX/SXA $nnnn, Y
+ ABSY_ADDR_W
+ AMY_MSB
+ and r0, r0, REG_X
+ WRITE_1
+ CYCLE_NEXT 5
+
+op9F: @ SHA/AXA $nnnn, Y
+ CYCLE_PRE 5
+ ABSY_ADDR_W
+ AMY_MSB
+ and r0, r0, REG_X
+ and r0, r0, REG_A, lsr #24
+ WRITE_1
+ CYCLE_NEXT 5,1,0
+
+opAB: @ LXA/ATX/OAL #$nn
+ IMM_VALUE
+ orr REG_A, REG_A, #0xee000000
+ OP_AND
+ mov REG_X, REG_A, lsr #24
+ CYCLE_NEXT 2
+
+opBB: @ LAS/LAR $nnnn,Y
+ CYCLE_PRE 4
+ ABSY_ADDR_W
+ READ_WRITE_1
+ READ_WRITE_2
+ b opBB_
+ READ_WRITE_3
+ READ_WRITE_4
+opBB_: and REG_X, r0, REG_S, lsr #24
+ bic REG_S, REG_S, #0xff<<24
+ orr REG_S, REG_S, REG_X, lsl #24
+ mov REG_A, REG_X, lsl #24
+ orr REG_NZ, REG_A, REG_A, lsr #24
+ CYCLE_NEXT 4,1,0
+
+
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
ALIGN
-@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
-@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
-@@@
-@@@ Undefined Opcodes
-@@@
-op0B: @ ANC #$nn
-op2B: @ ANC #$nn
-op8B: @ ANE #$nn
-op6B: @ ARR #$nn
-op4B: @ ASR #$nn
-@opC7: @ DCP $nn
-@opD7: @ DCP $nn, X
-@opCF: @ DCP $nnnn
-@opDF: @ DCP $nnnn, X
-@opDB: @ DCP $nnnn, Y
-@opC3: @ DCP ($nn, X)
-@opD3: @ DCP ($nn), Y
-
-
-
-@opE7: @ ISB $nn
-@opF7: @ ISB $nn, X
-@opEF: @ ISB $nnnn
-@opFF: @ ISB $nnnn, X
-@opFB: @ ISB $nnnn, Y
-@opE3: @ ISB ($nn, X)
-@opF3: @ ISB ($nn), Y
-
-
-op02: @ JAM
-op12:
-op22:
-op32:
-op42:
-op52:
-op62:
-op72:
-op92:
-opB2:
-opD2:
-opF2:
-
-
-opBB: @ LAS $nnnn,Y
-@opA3: @ LAX ($nn, X)
-@opA7: @ LAX $nn
-@opB7: @ LAX $nn, Y
-@opAF: @ LAX $nnnn
-@opBF: @ LAX $nnnn, Y
-
-@opB3: @ LAX ($nn), Y
-opAB: @ LXA #$nn
-@op27: @ RLA $nn
-@op37: @ RLA $nn, X
-@op2F: @ RLA $nnnn
-@op3F: @ RLA $nnnn, X
-@op23: @ RLA ($nn, X)
-@op67: @ RRA $nn
-@op77: @ RRA $nn, X
-@op6F: @ RRA $nnnn
-@op7F: @ RRA $nnnn, X
-@op63: @ RRA ($nn, X)
-op87: @ SAX $nn
-op97: @ SAX $nn, Y
-op8F: @ SAX $nnnn
-op83: @ SAX ($nn, X)
-@opCB: @ SBX #$nn
-op9F: @ SHA $nnnn, Y
-op93: @ SHA ($nn), Y
-op9B: @ SHS $nnnn, Y
-op9E: @ SHX $nnnn, Y
-@op03: @ SLO ($nn, X)
-@op07: @ SLO $nn
-@op17: @ SLO $nn, X
-@op0F: @ SLO $nnnn
-@op1F: @ SLO $nnnn, X
-@op47: @ SRE $nn
-@op57: @ SRE $nn, X
-@op4F: @ SRE $nnnn
-@op5F: @ SRE $nnnn, X
-@op5B: @ SRE $nnnn, Y
-@op43: @ SRE ($nn, X)
- CYCLE_NEXT 1
-@ emu_panic?
-
-
@@@@@@@@@@@@@@@@@@@@@@@@@@
@ fceu stuff...
.globl X6502_Run_a @ (int32 cycles);
.globl TriggerIRQ_a @ (void);
.globl TriggerNMI_a @ (void);
- .globl TriggerNMINSF_a @ (void);
.globl X6502_AddCycles_a @ (int x);
.globl X6502_IRQBegin_a @ (int w);
.globl X6502_IRQEnd_a @ (int w);
b X6502_IRQBegin_a
-TriggerNMINSF_a:
- @ not implemented
- bx lr
-
-
X6502_AddCycles_a:
ldr r3, =timestamp
ldr r2, =nes_registers
notaz.gp2x.de / fceu.git / blobdiff