X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=cpu%2FDrZ80%2Fdrz80.s;h=ff2a6b8b38d858e51027a9a69eb242a28a6d2e53;hb=a4dfdb6de1d63aed997554c347cd36cc33b134a3;hp=a623451b53168997358e5f3681a6cf15663872ee;hpb=d8f51995c466282c7c93f3666b1bc54b827ec19e;p=picodrive.git

diff --git a/cpu/DrZ80/drz80.s b/cpu/DrZ80/drz80.s
index a623451..ff2a6b8 100644
--- a/cpu/DrZ80/drz80.s
+++ b/cpu/DrZ80/drz80.s
@@ -19,7 +19,6 @@
 
 .if DRZ80_XMAP
       .equ Z80_MEM_SHIFT, 13
-      ;@ note: stack is locked in single bank that z80sp_base points to
 .endif
 
 .if INTERRUPT_MODE
@@ -98,6 +97,7 @@ DrZ80Ver: .long 0x0001
 	.equ Z80_IF1, 1<<0
 	.equ Z80_IF2, 1<<1
 	.equ Z80_HALT, 1<<2
+	.equ Z80_NMI, 1<<3
 
 ;@---------------------------------------
 
@@ -144,7 +144,7 @@ z80_xmap_write8_handler: @ data, addr, func
 z80_xmap_read16: @ addr
     @ check if we cross bank boundary
     add r1,r0,#1
-    eor r1,r0,r0
+    eor r1,r1,r0
     tst r1,#1<<Z80_MEM_SHIFT
     bne 0f
 
@@ -171,11 +171,11 @@ z80_xmap_read16: @ addr
 
 z80_xmap_write16: @ data, addr
     add r2,r1,#1
-    eor r2,r1,r1
+    eor r2,r2,r1
     tst r2,#1<<Z80_MEM_SHIFT
     bne 0f
 
-    ldr r2,[cpucontext,#z80_read8]
+    ldr r2,[cpucontext,#z80_write8]
     add r2,r2,r1,lsr #Z80_MEM_SHIFT-2
     bic r2,r2,#3
     ldr r2,[r2]
@@ -206,12 +206,30 @@ z80_xmap_rebase_pc:
     bxcc lr
 
 z80_bad_jump:
-    ldr r0,[cpucontext,#z80_read8]
-    ldr r0,[r0]
-    str r0,[cpucontext,#z80pc_base]
+    stmfd sp!,{r3,r12,lr}
+    mov lr,pc
+    ldr pc,[cpucontext,#z80_rebasePC]
     mov z80pc,r0
-    bx lr
-.endif
+    ldmfd sp!,{r3,r12,pc}
+
+z80_xmap_rebase_sp:
+    ldr r1,[cpucontext,#z80_read8]
+    sub r2,r0,#1
+    mov r2,r2,lsl #16
+    mov r2,r2,lsr #(Z80_MEM_SHIFT+16)
+    ldr r1,[r1,r2,lsl #2]
+    movs r1,r1,lsl #1
+    strcc r1,[cpucontext,#z80sp_base]
+    addcc z80sp,r1,r0
+    bxcc lr
+
+    stmfd sp!,{r3,r12,lr}
+    mov lr,pc
+    ldr pc,[cpucontext,#z80_rebaseSP]
+    mov z80sp,r0
+    ldmfd sp!,{r3,r12,pc}
+ 
+.endif @ DRZ80_XMAP
 
 
 .macro fetch cycs
@@ -367,15 +385,13 @@ z80_bad_jump:
      str z80pc,[cpucontext,#z80pc_pointer]
 .endif
 .if DRZ80_XMAP
-    ;@ XXX: SP is locked to single back z80sp_base points to.
-    ldr r1,[cpucontext,#z80sp_base]
-    bic r0,r0,#0x7f<<Z80_MEM_SHIFT
-    add r0,r1,r0
+    bl z80_xmap_rebase_sp
 .else
 	stmfd sp!,{r3,r12}
 	mov lr,pc
 	ldr pc,[cpucontext,#z80_rebaseSP]		;@ external function must rebase sp
 	ldmfd sp!,{r3,r12}
+	mov z80sp,r0
 .endif
 .endm
 ;@----------------------------------------------------------------------------
@@ -1344,9 +1360,11 @@ DrZ80Run:
 
 .if INTERRUPT_MODE == 0
 	;@ check ints
+	tst r0,#(Z80_NMI<<8)
+	blne DoNMI
 	tst r0,#0xff
 	movne r0,r0,lsr #8
-	tstne r0,#1
+	tstne r0,#Z80_IF1
 	blne DoInterrupt
 .endif
 
@@ -1500,6 +1518,36 @@ DoInterrupt_end:
 	ldmfd sp!,{pc} ;@ return
 .endif
 
+DoNMI:
+	stmfd sp!,{lr}
+
+	bic r0,r0,#((Z80_NMI|Z80_HALT|Z80_IF1)<<8)
+	strh r0,[cpucontext,#z80irq] @ 0x4C, irq and IFF bits
+
+	;@ push pc on stack
+	ldr r0,[cpucontext,#z80pc_base]
+	sub r2,z80pc,r0
+	opPUSHareg r2
+
+	;@ read new pc from vector address
+.if UPDATE_CONTEXT
+	str z80pc,[cpucontext,#z80pc_pointer]
+.endif
+	mov r0,#0x66
+.if DRZ80_XMAP
+	rebasepc
+.else
+	stmfd sp!,{r3,r12}
+	mov lr,pc
+	ldr pc,[cpucontext,#z80_rebasePC] ;@ r0=new pc - external function sets z80pc_base and returns new z80pc in r0
+	ldmfd sp!,{r3,r12}
+	mov z80pc,r0	
+.endif
+	ldrh r0,[cpucontext,#z80irq] @ 0x4C, irq and IFF bits
+	eatcycles 11
+	ldmfd sp!,{pc}
+
+
 .data
 .align 4
 
@@ -4492,7 +4540,6 @@ opcode_3_1:
 .if FAST_Z80SP
 	orr r0,r0,r1, lsl #8
 	rebasesp
-	mov z80sp,r0
 .else
 	orr z80sp,r0,r1, lsl #8
 .endif
@@ -5567,7 +5614,6 @@ opcode_F_9:
 .if FAST_Z80SP
 	mov r0,z80hl, lsr #16
 	rebasesp
-	mov z80sp,r0
 .else
 	mov z80sp,z80hl, lsr #16
 .endif
@@ -5602,7 +5648,7 @@ ei_return:
 	;@ check ints
 	tst r0,#0xff
 	movne r0,r0,lsr #8
-	tstne r0,#1
+	tstne r0,#Z80_IF1
 	blne DoInterrupt
 
 	;@ continue
@@ -6713,7 +6759,8 @@ opcode_DD_2E:
 opcode_DD_34:
 	ldrsb r0,[z80pc],#1
 	ldr r1,[z80xx]
-	add r0,r0,r1, lsr #16
+	add r0,r1,r0, lsl #16
+	mov r0,r0,lsr #16
 	stmfd sp!,{r0}	;@ save addr
 	readmem8
 	opINC8b
@@ -6724,7 +6771,8 @@ opcode_DD_34:
 opcode_DD_35:
 	ldrsb r0,[z80pc],#1
 	ldr r1,[z80xx]
-	add r0,r0,r1, lsr #16
+	add r0,r1,r0, lsl #16
+	mov r0,r0,lsr #16
 	stmfd sp!,{r0}	;@ save addr
 	readmem8
 	opDEC8b
@@ -6736,7 +6784,8 @@ opcode_DD_36:
 	ldrsb r2,[z80pc],#1
 	ldrb r0,[z80pc],#1
 	ldr r1,[z80xx]
-	add r1,r2,r1, lsr #16
+	add r1,r1,r2, lsl #16
+	mov r1,r1,lsr #16
 	writemem8
 	fetch 19
 ;@ADD IX,SP
@@ -6767,7 +6816,8 @@ opcode_DD_45:
 opcode_DD_46:
 	ldrsb r0,[z80pc],#1
 	ldr r1,[z80xx]
-	add r0,r0,r1, lsr #16
+	add r0,r1,r0, lsl #16
+	mov r0,r0,lsr #16
 	readmem8
 	and z80bc,z80bc,#0xFF<<16
 	orr z80bc,z80bc,r0, lsl #24
@@ -6788,7 +6838,8 @@ opcode_DD_4D:
 opcode_DD_4E:
 	ldrsb r0,[z80pc],#1
 	ldr r1,[z80xx]
-	add r0,r0,r1, lsr #16
+	add r0,r1,r0, lsl #16
+	mov r0,r0,lsr #16
 	readmem8
 	and z80bc,z80bc,#0xFF<<24
 	orr z80bc,z80bc,r0, lsl #16
@@ -6810,7 +6861,8 @@ opcode_DD_55:
 opcode_DD_56:
 	ldrsb r0,[z80pc],#1
 	ldr r1,[z80xx]
-	add r0,r0,r1, lsr #16
+	add r0,r1,r0, lsl #16
+	mov r0,r0,lsr #16
 	readmem8
 	and z80de,z80de,#0xFF<<16
 	orr z80de,z80de,r0, lsl #24
@@ -6831,7 +6883,8 @@ opcode_DD_5D:
 opcode_DD_5E:
 	ldrsb r0,[z80pc],#1
 	ldr r1,[z80xx]
-	add r0,r0,r1, lsr #16
+	add r0,r1,r0, lsl #16
+	mov r0,r0,lsr #16
 	readmem8
 	and z80de,z80de,#0xFF<<24
 	orr z80de,z80de,r0, lsl #16
@@ -6868,7 +6921,8 @@ opcode_DD_65:
 opcode_DD_66:
 	ldrsb r0,[z80pc],#1
 	ldr r1,[z80xx]
-	add r0,r0,r1, lsr #16
+	add r0,r1,r0, lsl #16
+	mov r0,r0,lsr #16
 	readmem8
 	and z80hl,z80hl,#0xFF<<16
 	orr z80hl,z80hl,r0, lsl #24
@@ -6910,7 +6964,8 @@ opcode_DD_6D:
 opcode_DD_6E:
 	ldrsb r0,[z80pc],#1
 	ldr r1,[z80xx]
-	add r0,r0,r1, lsr #16
+	add r0,r1,r0, lsl #16
+	mov r0,r0,lsr #16
 	readmem8
 	and z80hl,z80hl,#0xFF<<24
 	orr z80hl,z80hl,r0, lsl #16
@@ -6925,7 +6980,8 @@ opcode_DD_6F:
 opcode_DD_70:
 	ldrsb r0,[z80pc],#1
 	ldr r1,[z80xx]
-	add r1,r0,r1, lsr #16
+	add r1,r1,r0, lsl #16
+	mov r1,r1,lsr #16
 	mov r0,z80bc, lsr #24
 	writemem8
 	fetch 19
@@ -6933,7 +6989,8 @@ opcode_DD_70:
 opcode_DD_71:
 	ldrsb r0,[z80pc],#1
 	ldr r1,[z80xx]
-	add r1,r0,r1, lsr #16
+	add r1,r1,r0, lsl #16
+	mov r1,r1,lsr #16
 	mov r0,z80bc, lsr #16
 	and r0,r0,#0xFF
 	writemem8
@@ -6942,7 +6999,8 @@ opcode_DD_71:
 opcode_DD_72:
 	ldrsb r0,[z80pc],#1
 	ldr r1,[z80xx]
-	add r1,r0,r1, lsr #16
+	add r1,r1,r0, lsl #16
+	mov r1,r1,lsr #16
 	mov r0,z80de, lsr #24
 	writemem8
 	fetch 19
@@ -6950,7 +7008,8 @@ opcode_DD_72:
 opcode_DD_73:
 	ldrsb r0,[z80pc],#1
 	ldr r1,[z80xx]
-	add r1,r0,r1, lsr #16
+	add r1,r1,r0, lsl #16
+	mov r1,r1,lsr #16
 	mov r0,z80de, lsr #16
 	and r0,r0,#0xFF
 	writemem8
@@ -6959,7 +7018,8 @@ opcode_DD_73:
 opcode_DD_74:
 	ldrsb r0,[z80pc],#1
 	ldr r1,[z80xx]
-	add r1,r0,r1, lsr #16
+	add r1,r1,r0, lsl #16
+	mov r1,r1,lsr #16
 	mov r0,z80hl, lsr #24
 	writemem8
 	fetch 19
@@ -6967,7 +7027,8 @@ opcode_DD_74:
 opcode_DD_75:
 	ldrsb r0,[z80pc],#1
 	ldr r1,[z80xx]
-	add r1,r0,r1, lsr #16
+	add r1,r1,r0, lsl #16
+	mov r1,r1,lsr #16
 	mov r0,z80hl, lsr #16
 	and r0,r0,#0xFF
 	writemem8
@@ -6976,7 +7037,8 @@ opcode_DD_75:
 opcode_DD_77:
 	ldrsb r0,[z80pc],#1
 	ldr r1,[z80xx]
-	add r1,r0,r1, lsr #16
+	add r1,r1,r0, lsl #16
+	mov r1,r1,lsr #16
 	mov r0,z80a, lsr #24
 	writemem8
 	fetch 19
@@ -6995,7 +7057,8 @@ opcode_DD_7D:
 opcode_DD_7E:
 	ldrsb r0,[z80pc],#1
 	ldr r1,[z80xx]
-	add r0,r0,r1, lsr #16
+	add r0,r1,r0, lsl #16
+	mov r0,r0,lsr #16
 	readmem8
 	mov z80a,r0, lsl #24
 	fetch 19
@@ -7014,7 +7077,8 @@ opcode_DD_85:
 opcode_DD_86:
 	ldrsb r0,[z80pc],#1
 	ldr r1,[z80xx]
-	add r0,r0,r1, lsr #16
+	add r0,r1,r0, lsl #16
+	mov r0,r0,lsr #16
 	readmem8
 	opADDb
 	fetch 19
@@ -7033,7 +7097,8 @@ opcode_DD_8D:
 opcode_DD_8E:
 	ldrsb r0,[z80pc],#1
 	ldr r1,[z80xx]
-	add r0,r0,r1, lsr #16
+	add r0,r1,r0, lsl #16
+	mov r0,r0,lsr #16
 	readmem8
 	opADCb
 	fetch 19
@@ -7052,7 +7117,8 @@ opcode_DD_95:
 opcode_DD_96:
 	ldrsb r0,[z80pc],#1
 	ldr r1,[z80xx]
-	add r0,r0,r1, lsr #16
+	add r0,r1,r0, lsl #16
+	mov r0,r0,lsr #16
 	readmem8
 	opSUBb
 	fetch 19
@@ -7071,7 +7137,8 @@ opcode_DD_9D:
 opcode_DD_9E:
 	ldrsb r0,[z80pc],#1
 	ldr r1,[z80xx]
-	add r0,r0,r1, lsr #16
+	add r0,r1,r0, lsl #16
+	mov r0,r0,lsr #16
 	readmem8
 	opSBCb
 	fetch 19
@@ -7090,7 +7157,8 @@ opcode_DD_A5:
 opcode_DD_A6:
 	ldrsb r0,[z80pc],#1
 	ldr r1,[z80xx]
-	add r0,r0,r1, lsr #16
+	add r0,r1,r0, lsl #16
+	mov r0,r0,lsr #16
 	readmem8
 	opANDb
 	fetch 19
@@ -7109,7 +7177,8 @@ opcode_DD_AD:
 opcode_DD_AE:
 	ldrsb r0,[z80pc],#1
 	ldr r1,[z80xx]
-	add r0,r0,r1, lsr #16
+	add r0,r1,r0, lsl #16
+	mov r0,r0,lsr #16
 	readmem8
 	opXORb
 	fetch 19
@@ -7128,7 +7197,8 @@ opcode_DD_B5:
 opcode_DD_B6:
 	ldrsb r0,[z80pc],#1
 	ldr r1,[z80xx]
-	add r0,r0,r1, lsr #16
+	add r0,r1,r0, lsl #16
+	mov r0,r0,lsr #16
 	readmem8
 	opORb
 	fetch 19
@@ -7147,7 +7217,8 @@ opcode_DD_BD:
 opcode_DD_BE:
 	ldrsb r0,[z80pc],#1
 	ldr r1,[z80xx]
-	add r0,r0,r1, lsr #16
+	add r0,r1,r0, lsl #16
+	mov r0,r0,lsr #16
 	readmem8
 	opCPb
 	fetch 19
@@ -7159,7 +7230,8 @@ opcode_DD_CB:
 ;@moves the PC to the location of the subroutine
 	ldrsb r0,[z80pc],#1
 	ldr r1,[z80xx]
-	add r0,r0,r1, lsr #16
+	add r0,r1,r0, lsl #16
+	mov r0,r0,lsr #16
 
 	ldrb r1,[z80pc],#1
 	ldr pc,[pc,r1, lsl #2]
@@ -7407,7 +7479,6 @@ opcode_DD_F9:
 .if FAST_Z80SP
 	ldrh r0,[z80xx,#2]
 	rebasesp
-	mov z80sp,r0
 .else
 	ldrh z80sp,[z80xx,#2]
 .endif
@@ -7745,8 +7816,9 @@ opcode_ED_7B:
 	readmem16
 .if FAST_Z80SP
 	rebasesp
-.endif
+.else
 	mov z80sp,r0
+.endif
 	fetch 20
 ;@LDI
 opcode_ED_A0: