X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?p=fceu.git;a=blobdiff_plain;f=ncpu.S;h=6b68fe7ae4f827d059f6a815b9490d6e00cc428f;hp=2a7fafe7ac5a7d8f4b8664eb7ae18bfdc30b9233;hb=8fa5eb3371d902b8d58dba6e6bf62726d7ed8dbc;hpb=92e249b10ad9e479eddb18974555366dba725ef3

diff --git a/ncpu.S b/ncpu.S
index 2a7fafe..6b68fe7 100644
--- a/ncpu.S
+++ b/ncpu.S
@@ -16,7 +16,8 @@
 #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_X         (X                - cpu_exec_table)
+#define OTOFFS_TIMESTAMP (timestamp        - cpu_exec_table)
+#define OTOFFS_X         (X_               - cpu_exec_table)
 
 @ fceu
 #define FCEU_IQNMI      0x08
@@ -30,7 +31,17 @@
 	SECTION_TEXT
 	ALIGN
 
-
+/*
+bbbb:
+.ascii "lsr_a: %02x"
+.byte 0x0a,0
+.align 4
+stmfd sp!,{r0-r3,r12,lr}
+mov r1,r0
+ldr r0,=bbbb
+bl printf
+ldmfd sp!,{r0-r3,r12,lr}
+*/
 
 @@@
 @@@ r0	=  Address (unbased)
@@ -38,6 +49,12 @@
 @@@
 .macro	REBASE_PC
 	@ FIXME: do something with mem not in Page[].
+@	stmfd	sp!, {r0-r3,r12,lr}
+@	mov	r1, r0
+@	ldr     r0, =bbbb
+@	bl      printf
+@	ldmfd	sp!, {r0-r3,r12,lr}
+
 	cmp     r0, #0x2000
 	ldrge	r1, =Page
 	movge	r2, r0, lsr #11
@@ -50,6 +67,16 @@
 .endm
 
 
+@ updates fceu "timestamp" variable
+@ loads cycles to reg, reg!=r1, trashes r1
+.macro	FLUSH_TIMESTAMP reg
+	ldr	r1, [REG_OP_TABLE, #OTOFFS_TIMESTAMP]
+	and	\reg, REG_CYCLE, #0xff
+	add	r1, r1, \reg
+	bic	REG_CYCLE, REG_CYCLE, #0xff
+	str	r1, [REG_OP_TABLE, #OTOFFS_TIMESTAMP]
+.endm
+
 
 @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
 @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@@ -61,14 +88,16 @@
 @@@
 @@@ ¤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
+	add	REG_CYCLE, REG_CYCLE, #\n
+	subs	REG_CYCLE, REG_CYCLE, #\n*48<<16
 	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]
@@ -94,11 +123,6 @@
 @@@ CLI¡¦PHP¤Ê¤É¥Õ¥é¥°¤òÊѹ¹¤·¤¿¾ì¹ç¤Ï¤³¤ì
 @@@
 .macro	CYCLE_NEXT_INT	n
-@	@@DEBUG_INFO
-@
-@	subs	REG_CYCLE, REG_CYCLE, #\n*48
-@	bgt	cpu_exec_check_int
-@	RETURN_FROM_CPU_EXEC
 	CYCLE_NEXT	\n
 .endm
 
@@ -251,18 +275,7 @@
 	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
@@ -277,6 +290,22 @@
 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
 @@@
@@ -427,7 +456,8 @@
 	bic	REG_ADDR, REG_ADDR, #0x10000
 	and	r0,REG_ADDR,#0xff
 	cmp	REG_Y,r0
-	subgt	REG_CYCLE,REG_CYCLE,#1*48
+	addgt	REG_CYCLE, REG_CYCLE, #1
+	subgt	REG_CYCLE, REG_CYCLE, #1*48<<16
 .endm
 
 @ Indirect Indexed (for writes and rmws)
@@ -464,7 +494,8 @@
 	bic	REG_ADDR, REG_ADDR, #0x10000
 	and	r0,REG_ADDR,#0xff
 	cmp	REG_X,r0
-	subgt	REG_CYCLE,REG_CYCLE,#1*48
+	addgt	REG_CYCLE, REG_CYCLE, #1
+	subgt	REG_CYCLE, REG_CYCLE, #1*48<<16
 .endm
 
 @ Absolute Indexed (for writes and rmws)
@@ -482,7 +513,8 @@
 	bic	REG_ADDR, REG_ADDR, #0x10000
 	and	r0,REG_ADDR,#0xff
 	cmp	REG_Y,r0
-	subgt	REG_CYCLE,REG_CYCLE,#1*48
+	addgt	REG_CYCLE, REG_CYCLE, #1
+	subgt	REG_CYCLE, REG_CYCLE, #1*48<<16
 .endm
 
 @ Absolute Indexed (for writes and rmws)
@@ -1888,14 +1920,16 @@ op7E:	@ ROR $nnnn, X
 	and	r1,r1,#0xff
 	add	r1,r3,r1
 	tst	r1,#0x100
-	subne	REG_CYCLE,REG_CYCLE, #1*48
+	addne	REG_CYCLE, REG_CYCLE, #1
+	subne	REG_CYCLE, REG_CYCLE, #1*48<<16
 .endm
 
 .macro	BRANCH_EQ
 	ldreqsb	r1, [REG_PC], #1
 	movne	r1, #1
 	add	REG_PC, REG_PC, r1
-	subeq	REG_CYCLE, REG_CYCLE, #1*48
+	addeq	REG_CYCLE, REG_CYCLE, #1
+	subeq	REG_CYCLE, REG_CYCLE, #1*48<<16
 	bne	1f
 	HAD_BRANCH
 1:
@@ -1905,7 +1939,8 @@ op7E:	@ ROR $nnnn, X
 	ldrnesb	r1, [REG_PC], #1
 	moveq	r1, #1
 	add	REG_PC, REG_PC, r1
-	subne	REG_CYCLE, REG_CYCLE, #1*48
+	addne	REG_CYCLE, REG_CYCLE, #1
+	subne	REG_CYCLE, REG_CYCLE, #1*48<<16
 	beq	1f
 	HAD_BRANCH
 1:
@@ -2751,7 +2786,19 @@ do_int:
 	subne	REG_ADDR, REG_ADDR, #NMI_VECTOR
 	READ_WORD
 	REBASE_PC
-	CYCLE_NEXT	7
+@	CYCLE_NEXT	7
+
+	add	REG_CYCLE, REG_CYCLE, #7
+	subs	REG_CYCLE, REG_CYCLE, #7*48<<16
+	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
@@ -2797,6 +2844,7 @@ reset_cpu:
 @@@
 
 read_rom_byte:
+#ifndef DEBUG_ASM_6502
 	ldr	r0, =CartBR
 	ldr	r2, =ARead
 	mov	r1, #0xff00
@@ -2809,6 +2857,7 @@ read_rom_byte:
 	ldr	r2, [r2, r1, lsl #2]
 	ldrb	r0, [r2, REG_ADDR]
 	bx	lr
+#endif
 
 
 read_ppu_reg:
@@ -2822,10 +2871,19 @@ read_save_ram:
 	mov     REG_PC, lr			@ r7
 	mov	REG_P_REST, r3			@ r8
 
+#ifndef DEBUG_ASM_6502
 	ldr	r2, =ARead
 	bic     r0, REG_ADDR, #0x00ff0000
 	mov	lr, pc
 	ldr	pc, [r2, r0, lsl #2]
+#else
+	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
 	mov	lr, REG_PC
@@ -2841,12 +2899,15 @@ write_ppu_reg:
 write_high_reg:
 write_save_ram:
 write_rom_byte:
-	@ must preserve r3 for the callers too
+	FLUSH_TIMESTAMP r2			@ Blaster Master, more...
+#ifndef DEBUG_ASM_6502
+	@ 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
@@ -2857,9 +2918,22 @@ write_rom_byte:
 	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]
+	and	r0, r0, #0xff
+#endif
 	bx	lr
 
 
@@ -2883,9 +2957,14 @@ cpu_exec:
 
 @	ldr   REG_OP_TABLE, = cpu_exec_table @ set on init
 
-	CYCLE_NEXT	0
+	CYCLE_NEXT	0, 0
 
 cpu_exec_end:
+	FLUSH_TIMESTAMP r0
+
+	tst	REG_P_REST, #1<<16
+	blne	do_irq_hook_noflushts
+
 	ldr     r0, =nes_registers
 	stmia	r0, {r4-r12}
 
@@ -2958,9 +3037,7 @@ cpu_exec_table:
 @@@
 nes_registers:
 	.fill   0x40, 1, 0
-#ifndef DEBUG_ASM_6502
 RAM:
-#endif
 nes_internal_ram:
 	.fill	0x100, 1, 0
 nes_stack:
@@ -2968,13 +3045,15 @@ nes_stack:
 @ TODO: write code which keeps it up-to-date
 pc_base:
 	.long	0
-#ifndef DEBUG_ASM_6502
 MapIRQHook:
 	.long	0
 timestamp:
+timestamp_a:
 	.long	0
-X:	.fill   0x20, 1, 0
+#ifndef DEBUG_ASM_6502
+X:
 #endif
+X_:	.fill   0x20, 1, 0
 
 .pool
 
@@ -3085,11 +3164,14 @@ op9E:	@ SHX $nnnn, Y
 	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
+	.globl	timestamp_a
 #endif
 	.globl	X6502_Reset_a @ (void);
 	.globl	X6502_Power_a @ (void);
@@ -3100,7 +3182,7 @@ op9E:	@ SHX $nnnn, Y
 	.globl	X6502_AddCycles_a @ (int x);
 	.globl	X6502_IRQBegin_a @ (int w);
 	.globl	X6502_IRQEnd_a @ (int w);
-	.globl	X6502_rebase_a @ (void);
+	.globl	X6502_Rebase_a @ (void);
 
 	SECTION_TEXT
 	ALIGN
@@ -3158,15 +3240,15 @@ TriggerNMINSF_a:
 
 X6502_AddCycles_a:
 	ldr	r2, =nes_registers
-	ldr	r1, [r2, #0x1c]
+	ldrsh	r1, [r2, #0x1e]
 	mvn	r3, #47			@ r3=-48
 	mla	r0, r3, r0, r1
-	str	r0, [r2, #0x1c]
+	strh	r0, [r2, #0x1e]
 	bx	lr
 
 
 @ rebase PC when not executing or in memhandlers
-X6502_rebase_a:
+X6502_Rebase_a:
 	stmfd	sp!,{REG_PC,REG_OP_TABLE}
 	ldr	REG_OP_TABLE, =cpu_exec_table
 	ldr	r0, [REG_OP_TABLE, #(OTOFFS_NES_REGS+0x0c)] @ PC
@@ -3180,7 +3262,12 @@ X6502_rebase_a:
 
 
 @ the nasty MapIRQHook thing from FCE..
+@ test Gradius 2 (J) if you change this
 do_irq_hook:
+	FLUSH_TIMESTAMP r0
+
+do_irq_hook_noflushts:
+#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
@@ -3192,6 +3279,11 @@ do_irq_hook:
 	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