X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=cpu%2FDrZ80%2Fdrz80.s;h=846c6362b2640f3056e80b720c8157523dfd6635;hb=2b02d6e533b114456785f39a356476eb97306fcf;hp=9b07a133b551ce8d7ee1fcb2acdfe02506b49caa;hpb=170435846c8e2309dc4011f954287f9ea861a6b6;p=picodrive.git

diff --git a/cpu/DrZ80/drz80.s b/cpu/DrZ80/drz80.s
index 9b07a13..846c636 100644
--- a/cpu/DrZ80/drz80.s
+++ b/cpu/DrZ80/drz80.s
@@ -24,7 +24,7 @@
       .extern PicoRead8
       .extern Pico
       .extern z80_write
-      .extern ym2612_st
+      .extern ym2612_read_local_z80
 .endif
 
 DrZ80Ver: .long 0x0001
@@ -360,8 +360,8 @@ pico_z80_write16: @ data, addr
      str z80pc,[cpucontext,#z80pc_pointer]
 .endif
 .if DRZ80_FOR_PICODRIVE
-    bic r0,r0,#0xfe000
     ldr r1,[cpucontext,#z80pc_base]
+    bic r0,r0,#0xfe000
     add z80pc,r1,r0
 .else
     stmfd sp!,{r3,r12}
@@ -1372,30 +1372,32 @@ DrZ80Run:
 	mov z80_icount,r1						;@ setup number of Tstates to execute
 
 .if INTERRUPT_MODE == 0
-	ldrh r0,[cpucontext,#z80irq] @ 0x4C
+	ldrh r0,[cpucontext,#z80irq] @ 0x4C, irq and IFF bits
 .endif
 	ldmia cpucontext,{z80pc-z80sp}			;@ load Z80 registers
 
 .if INTERRUPT_MODE == 0
 	;@ check ints
-	tst r0,#1
-	movnes r0,r0,lsr #8
-    blne DoInterrupt
+	tst r0,#0xff
+	movne r0,r0,lsr #8
+	tstne r0,#1
+	blne DoInterrupt
 .endif
 
-	ldrb r0,[z80pc],#1    ;@ get first op code
 	ldr opcodes,MAIN_opcodes_POINTER2
-	ldr pc,[opcodes,r0, lsl #2]  ;@ execute op code
 
-MAIN_opcodes_POINTER2: .word MAIN_opcodes
+	cmp z80_icount,#0     ;@ irq might have used all cycles
+	ldrplb r0,[z80pc],#1
+	ldrpl pc,[opcodes,r0, lsl #2]
 
 
 z80_execute_end:
 	;@ save registers in CPU context
 	stmia cpucontext,{z80pc-z80sp}			;@ save Z80 registers
-    mov r0,z80_icount
+	mov r0,z80_icount
 	ldmia sp!,{r4-r12,pc}					;@ restore registers from stack and return to C code
 
+MAIN_opcodes_POINTER2: .word MAIN_opcodes
 .if INTERRUPT_MODE
 Interrupt_local: .word Interrupt
 .endif
@@ -1414,6 +1416,8 @@ DoInterrupt:
 	ldmia cpucontext,{z80pc-z80sp}			;@ load Z80 registers
 	mov pc,lr ;@ return
 .else
+
+	;@ r0 == z80if
 	stmfd sp!,{lr}
 
 	tst r0,#4 ;@ check halt
@@ -1426,10 +1430,9 @@ DoInterrupt:
 	strb r0,[cpucontext,#z80if]
 
 	;@ now check int mode
-    tst r1,#1
-    bne DoInterrupt_mode1
-    tst r1,#2
-    bne DoInterrupt_mode2
+	cmp r1,#1
+	beq DoInterrupt_mode1
+	bgt DoInterrupt_mode2
 
 DoInterrupt_mode0:
 	;@ get 3 byte vector
@@ -1459,6 +1462,7 @@ DoInterrupt_mode0:
 	;@ rebase new pc
 	rebasepc
 
+	eatcycles 13
 	b DoInterrupt_end
 
 1:
@@ -1473,6 +1477,7 @@ DoInterrupt_mode0:
 	;@ rebase new pc
 	rebasepc
 
+	eatcycles 13
 	b DoInterrupt_end
 
 DoInterrupt_mode1:
@@ -1482,6 +1487,7 @@ DoInterrupt_mode1:
 	mov r0,#0x38
 	rebasepc
 
+	eatcycles 13
 	b DoInterrupt_end
 
 DoInterrupt_mode2:
@@ -1518,18 +1524,19 @@ DoInterrupt_mode2:
 	ldmfd sp!,{r3,r12}
 	mov z80pc,r0	
 .endif
+	eatcycles 17
 
 DoInterrupt_end:
 	;@ interupt accepted so callback irq interface
 	ldr r0,[cpucontext, #z80irqcallback]
 	tst r0,r0
+	streqb r0,[cpucontext,#z80irq]       ;@ default handling
 	ldmeqfd sp!,{pc}
 	stmfd sp!,{r3,r12}
 	mov lr,pc
 	mov pc,r0    ;@ call callback function
 	ldmfd sp!,{r3,r12}
 	ldmfd sp!,{pc} ;@ return
-
 .endif
 
 .data
@@ -4568,7 +4575,7 @@ opcode_3_8:
 	tst z80f,#1<<CFlag
 	bne opcode_1_8
 	add z80pc,z80pc,#1
-	fetch 8
+	fetch 7
 ;@ADD HL,SP
 opcode_3_9:
 .if FAST_Z80SP
@@ -4586,7 +4593,7 @@ opcode_3_A:
 	orr r0,r0,r1, lsl #8
 	readmem8
 	mov z80a,r0, lsl #24
-	fetch 11
+	fetch 13
 ;@DEC SP
 opcode_3_B:
 	sub z80sp,z80sp,#1
@@ -4890,6 +4897,7 @@ opcode_7_6:
 	ldrb r0,[cpucontext,#z80if]
 	orr r0,r0,#Z80_HALT
 	strb r0,[cpucontext,#z80if]
+	mov z80_icount,#0
 	b z80_execute_end
 ;@LD (HL),A
 opcode_7_7:
@@ -5146,7 +5154,7 @@ opcode_B_F:
 ;@RET NZ
 opcode_C_0:
 	tst z80f,#1<<ZFlag
-	beq opcode_C_9		;@unconditional RET
+	beq opcode_C_9_cond		;@unconditional RET
 	fetch 5
 
 ;@POP BC
@@ -5189,8 +5197,11 @@ opcode_C_7:
 ;@RET Z
 opcode_C_8:
 	tst z80f,#1<<ZFlag
-	bne opcode_C_9		;@unconditional RET
+	bne opcode_C_9_cond		;@unconditional RET
 	fetch 5
+
+opcode_C_9_cond:
+	eatcycles 1
 ;@RET
 opcode_C_9:
     opPOP
@@ -5271,7 +5282,7 @@ opcode_C_F:
 ;@RET NC
 opcode_D_0:
 	tst z80f,#1<<CFlag
-	beq opcode_C_9		;@unconditional RET
+	beq opcode_C_9_cond		;@unconditional RET
 	fetch 5
 ;@POP DE
 opcode_D_1:
@@ -5313,7 +5324,7 @@ opcode_D_7:
 ;@RET C
 opcode_D_8:
 	tst z80f,#1<<CFlag
-	bne opcode_C_9		;@unconditional RET
+	bne opcode_C_9_cond		;@unconditional RET
 	fetch 5
 ;@EXX
 opcode_D_9:
@@ -5399,7 +5410,7 @@ opcode_D_F:
 ;@RET PO
 opcode_E_0:
 	tst z80f,#1<<VFlag
-	beq opcode_C_9		;@unconditional RET
+	beq opcode_C_9_cond		;@unconditional RET
 	fetch 5
 ;@POP HL
 opcode_E_1:
@@ -5454,7 +5465,7 @@ opcode_E_7:
 ;@RET PE
 opcode_E_8:
 	tst z80f,#1<<VFlag
-	bne opcode_C_9		;@unconditional RET
+	bne opcode_C_9_cond		;@unconditional RET
 	fetch 5
 ;@JP (HL)
 opcode_E_9:
@@ -5530,7 +5541,7 @@ opcode_E_F:
 ;@RET P
 opcode_F_0:
 	tst z80f,#1<<SFlag
-	beq opcode_C_9		;@unconditional RET
+	beq opcode_C_9_cond		;@unconditional RET
 	fetch 5
 ;@POP AF
 opcode_F_1:
@@ -5588,7 +5599,7 @@ opcode_F_7:
 ;@RET M
 opcode_F_8:
 	tst z80f,#1<<SFlag
-	bne opcode_C_9		;@unconditional RET
+	bne opcode_C_9_cond		;@unconditional RET
 	fetch 5
 ;@LD SP,HL
 opcode_F_9:
@@ -5599,7 +5610,7 @@ opcode_F_9:
 .else
 	mov z80sp,z80hl, lsr #16
 .endif
-	fetch 4
+	fetch 6
 ;@JP M,$+3
 opcode_F_A:
 	tst z80f,#1<<SFlag
@@ -5611,13 +5622,12 @@ EI_DUMMY_opcodes_POINTER: .word EI_DUMMY_opcodes
 ;@EI
 opcode_F_B:
 	ldrb r1,[cpucontext,#z80if]
-	tst r1,#Z80_IF1
-	bne ei_return_exit
-
+	mov r2,opcodes
 	orr r1,r1,#(Z80_IF1)|(Z80_IF2)
 	strb r1,[cpucontext,#z80if]
 
-	mov r2,opcodes
+	ldrb r0,[z80pc],#1
+	eatcycles 4
 	ldr opcodes,EI_DUMMY_opcodes_POINTER
 	ldr pc,[r2,r0, lsl #2]
 
@@ -5625,16 +5635,17 @@ ei_return:
 	;@point that program returns from EI to check interupts
 	;@an interupt can not be taken directly after a EI opcode
 	;@ reset z80pc and opcode pointer
-	ldrh r0,[cpucontext,#z80irq] @ 0x4C
+	ldrh r0,[cpucontext,#z80irq] @ 0x4C, irq and IFF bits
 	sub z80pc,z80pc,#1
 	ldr opcodes,MAIN_opcodes_POINTER
 	;@ check ints
-	tst r0,#1
-	movnes r0,r0,lsr #8
-    blne DoInterrupt
+	tst r0,#0xff
+	movne r0,r0,lsr #8
+	tstne r0,#1
+	blne DoInterrupt
+
 	;@ continue
-ei_return_exit:
-	fetch 4
+	fetch 0
 
 ;@CALL M,NN
 opcode_F_C:
@@ -6641,7 +6652,7 @@ opcode_DD_NF:
 ;@	b end_loop
 
 opcode_DD_NF2:
-	fetch 15
+	fetch 23
 ;@ notaz: we don't want to deadlock here
 ;@	mov r0,#0xDD0000
 ;@	orr r0,r0,#0xCB00
@@ -8044,5 +8055,5 @@ opcode_ED_BB:
 ;@end_loop:
 ;@     b end_loop
 
-
+;@ vim:filetype=armasm