#define OTOFFS_NES_REGS (nes_registers - cpu_exec_table)
#define OTOFFS_PC_BASE (pc_base - cpu_exec_table)
#define OTOFFS_IRQ_HOOK (MapIRQHook - cpu_exec_table)
+#define OTOFFS_IRQH_CYC (MapIRQHookCyc - cpu_exec_table)
#define OTOFFS_X (X_ - cpu_exec_table)
@ fceu
SECTION_TEXT
ALIGN
+/*
bbbb:
.ascii "rebase: %04x"
.byte 0x0a,0
.align 4
-
+*/
@@@
@@@ r0 = Address (unbased)
@@@
@@@ ¤Ê¤ó¤«Ì¾Á°¤¬ÊѤÀ¤Ê(¤É¡¼¤Ç¤â¤¤¡¼¤±¤É¡¼
@@@
-.macro CYCLE_NEXT n
+.macro CYCLE_NEXT n, hook_check=1
@@DEBUG_INFO
subs REG_CYCLE, REG_CYCLE, #\n*48
ble cpu_exec_end
+.if \hook_check
tst REG_P_REST, #1<<16
- movne r0, #\n
blne do_irq_hook
+.endif
ldrb r0, [REG_PC], #1
tst REG_P_REST, #0xff<<8
ldreq pc, [REG_OP_TABLE, r0, lsl #2]
strb r0, [REG_ADDR]
.endm
-.macro READ_WRITE_3
- .long read_rom_byte
- .long read_rom_byte
- .long read_rom_byte
- .long read_rom_byte
- .long read_save_ram
- .long read_high_reg
- .long read_ppu_reg
-9999:
-.endm
-
-.macro READ_WRITE_4
+.macro READ_WRITE_W
adr lr, 1f
ldr pc, [pc, r3, lsl #2]
nop
1:
.endm
+.macro READ_WRITE_3
+ .long read_rom_byte
+ .long read_rom_byte
+ .long read_rom_byte
+ .long read_rom_byte
+ .long read_save_ram
+ .long read_high_reg
+ .long read_ppu_reg
+9999:
+ READ_WRITE_W @ rmw first writes unmodified data
+.endm
+
+.macro READ_WRITE_4
+ READ_WRITE_W @ and only then modified (Blaster Master)
+.endm
+
@@@
@@@ ½ñ¤¹þ¤ß¤À¤±¤Î¾ì¹ç
@@@
subne REG_ADDR, REG_ADDR, #NMI_VECTOR
READ_WORD
REBASE_PC
- CYCLE_NEXT 7
+@ CYCLE_NEXT 7
+
+ subs REG_CYCLE, REG_CYCLE, #7*48
+ ble cpu_exec_end
+ ldrb r0, [REG_PC], #1
+ tst REG_P_REST, #0xff<<8
+ ldreq pc, [REG_OP_TABLE, r0, lsl #2]
+
+ tst REG_P_REST, #P_REST_I_FLAG
+ ldrne pc, [REG_OP_TABLE, r0, lsl #2]
+ b do_int
+
@@@
@@@ ¥ê¥»¥Ã¥È¤Î½èÍý
@@@
read_rom_byte:
+#ifndef DEBUG_ASM_6502
ldr r0, =CartBR
ldr r2, =ARead
mov r1, #0xff00
ldr r2, [r2, r1, lsl #2]
ldrb r0, [r2, REG_ADDR]
bx lr
+#endif
read_ppu_reg:
mov lr, pc
ldr pc, [r2, r0, lsl #2]
#else
- ldr r1, =cpu_lastval
- ldr r0, [r1]
- tst r0, #0x20000
- orreq r0, r0, #0x20000
- streq r0, [r1]
- movne r0, r0, lsr #8
- and r0, r0, #0xff
+ ldr r2, =dread_count_a
+ ldr r0, =dreads
+ ldr r1, [r2]
+ ldrb r0, [r0, r1]
+ add r1, r1, #1
+ str r1, [r2]
#endif
ldr REG_OP_TABLE, =cpu_exec_table @ got trashed because was in r12
write_save_ram:
write_rom_byte:
#ifndef DEBUG_ASM_6502
- @ must preserve r3 for the callers too
+ @ must preserve r0 (data) and r3 for the callers
str REG_PC, [REG_OP_TABLE, #(OTOFFS_NES_REGS + 0x0c)] @ might get rebased
str REG_P_REST, [REG_OP_TABLE, #(OTOFFS_NES_REGS + 0x10)] @ might set irq
str REG_CYCLE, [REG_OP_TABLE, #(OTOFFS_NES_REGS + 0x1c)] @ might get used
mov REG_PC, lr @ r7
mov REG_P_REST, r3 @ r8
+ mov REG_CYCLE, r0 @ r11
ldr r2, =BWrite
mov r1, r0
ldr REG_OP_TABLE, =cpu_exec_table @ got trashed because was in r12
mov lr, REG_PC
mov r3, REG_P_REST
+ mov r0, REG_CYCLE
ldr REG_PC, [REG_OP_TABLE, #(OTOFFS_NES_REGS + 0x0c)] @ might get rebased
ldr REG_P_REST, [REG_OP_TABLE, #(OTOFFS_NES_REGS + 0x10)] @ might set irq
ldr REG_CYCLE, [REG_OP_TABLE, #(OTOFFS_NES_REGS + 0x1c)] @ might get used
+#else
+ ldr r1, =dwrite_count_a
+ ldr r2, =dwrites_a
+ ldr r1, [r1]
+ and r0, r0, #0xff
+ orr r0, r0, REG_ADDR, lsl #8
+ str r0, [r2, r1, lsl #2]
+ ldr r2, =dwrite_count_a
+ add r1, r1, #1
+ str r1, [r2]
#endif
bx lr
@ ldr REG_OP_TABLE, = cpu_exec_table @ set on init
- CYCLE_NEXT 0
+ tst REG_P_REST, #1<<16
+ strne REG_CYCLE, [REG_OP_TABLE, #OTOFFS_IRQH_CYC]
+
+ CYCLE_NEXT 0, 0
cpu_exec_end:
+ tst REG_P_REST, #1<<16
+ blne do_irq_hook
+
ldr r0, =nes_registers
stmia r0, {r4-r12}
.long 0
MapIRQHook:
.long 0
+MapIRQHookCyc:
+ .long 0
timestamp:
.long 0
#ifndef DEBUG_ASM_6502
ALIGN
.globl nes_registers @ TODO: hide?
.globl pc_base
+ .globl MapIRQHook @ (int a)
#ifndef DEBUG_ASM_6502
.globl X
.globl RAM
.globl timestamp
- .globl MapIRQHook @ (int a)
#else
.globl nes_internal_ram
#endif
@ the nasty MapIRQHook thing from FCE..
+@ test Gradius 2 (J) if you change this
do_irq_hook:
+ @ ((cycles >> 4) * 43) >> 7; // aproximating /= 48
+ ldr r1, [REG_OP_TABLE, #OTOFFS_IRQH_CYC]
+ str REG_CYCLE, [REG_OP_TABLE, #OTOFFS_IRQH_CYC]
+ mov r0, #43
+ sub r1, r1, REG_CYCLE
+ mul r0, r1, r0
+ mov r0, r0, lsr #11
+
+#ifndef DEBUG_ASM_6502
@ I have reviewed all MapIRQHook functions, they only seem to cause IRQs, not messing cycles or something
str REG_P_REST, [REG_OP_TABLE, #(OTOFFS_NES_REGS + 0x10)] @ might set irq
mov REG_P_REST, lr @ r8
ldr REG_OP_TABLE, =cpu_exec_table @ got trashed because was in r12
mov lr, REG_P_REST
ldr REG_P_REST, [REG_OP_TABLE, #(OTOFFS_NES_REGS + 0x10)] @ might set irq
+#else
+ ldr r1, =mapirq_cyc_a
+ str r0, [r1]
+ mov r1, r0
+#endif
bx lr