From 8b9d21443e30fd1da7df11aa6d1c903cb954d6f0 Mon Sep 17 00:00:00 2001
From: notaz <notasas@gmail.com>
Date: Sun, 16 Jun 2013 19:43:12 +0300
Subject: [PATCH] disa improvements from PicoDrive
---
Disa/Disa.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 49 insertions(+), 2 deletions(-)
diff --git a/Disa/Disa.c b/Disa/Disa.c
index 01a54bc..562929b 100644
--- a/Disa/Disa.c
+++ b/Disa/Disa.c
@@ -283,6 +283,21 @@ static int DisaMoveSr(int op)
return 0;
}
+static int OpChk(int op)
+{
+ int sea=0,dea=0;
+ char seat[64]="",deat[64]="";
+
+ sea=op&0x003f;
+ DisaGetEa(seat,sea,0);
+
+ dea=(op>>9)&7; dea|=8;
+ DisaGetEa(deat,dea,2);
+
+ sprintf(DisaText,"chk %s, %s",seat,deat);
+ return 0;
+}
+
// ================ Opcodes 0x41c0+ ================
static int DisaLea(int op)
{
@@ -337,6 +352,20 @@ static int MakeRegList(char *list,int mask,int ea)
return 0;
}
+// ================ Opcodes 0x4800+ ================
+static int DisaNbcd(int op)
+{
+ // Nbcd 01001000 00eeeeee (eeeeee=ea)
+ int ea=0;
+ char eat[64]="";
+
+ ea=op&0x003f;
+ DisaGetEa(eat,ea,0);
+
+ sprintf(DisaText,"nbcd %s",eat);
+ return 0;
+}
+
// ================ Opcodes 0x4840+ ================
static int DisaSwap(int op)
{
@@ -476,6 +505,19 @@ static int DisaTst(int op)
return 0;
}
+static int DisaTas(int op)
+{
+ // Tas 01001010 11eeeeee (eeeeee=ea)
+ int ea=0;
+ char eat[64]="";
+
+ ea=op&0x003f;
+ DisaGetEa(eat,ea,0);
+
+ sprintf(DisaText,"tas %s",eat);
+ return 0;
+}
+
// ================ Opcodes 0x4e80+ ================
static int DisaJsr(int op)
{
@@ -741,14 +783,16 @@ static int DisaExg(int op)
static int DisaAddx(int op)
{
// 1t01ddd1 xx000sss addx
- int type=0,size=0,dea=0,sea=0;
+ int type=0,size=0,dea=0,sea=0,mem;
char deat[64]="",seat[64]="";
char *opcode[6]={"","subx","","","","addx"};
type=(op>>12)&5;
dea =(op>> 9)&7;
size=(op>> 6)&3; if (size>=3) return 1;
- sea = op&0x3f;
+ sea = op&7;
+ mem = op&8;
+ if(mem) { sea+=0x20; dea+=0x20; }
DisaGetEa(deat,dea,size);
DisaGetEa(seat,sea,size);
@@ -805,13 +849,16 @@ static int TryOp(int op)
if ((op&0xff00)==0x0800) DisaBtstImm(op); // Btst/Bchg/Bclr/Bset
if ((op&0xc000)==0x0000) DisaMove(op);
if ((op&0xf900)==0x4000) DisaNeg(op); // Negx/Clr/Neg/Not
+ if ((op&0xf140)==0x4100) OpChk(op);
if ((op&0xf1c0)==0x41c0) DisaLea(op);
if ((op&0xf9c0)==0x40c0) DisaMoveSr(op);
+ if ((op&0xffc0)==0x4800) DisaNbcd(op);
if ((op&0xfff8)==0x4840) DisaSwap(op);
if ((op&0xffc0)==0x4840) DisaPea(op);
if ((op&0xffb8)==0x4880) DisaExt(op);
if ((op&0xfb80)==0x4880) DisaMovem(op);
if ((op&0xff00)==0x4a00) DisaTst(op);
+ if ((op&0xffc0)==0x4ac0) DisaTas(op);
if ((op&0xfff0)==0x4e40) DisaTrap(op);
if ((op&0xfff8)==0x4e50) DisaLink(op);
if ((op&0xfff8)==0x4e58) DisaUnlk(op);
--
2.39.5