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cpu.cc
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/*
* UAE - The Unusable Amiga Emulator
*
* MC68000 emulation v0.5
*
* v0.0: 950227
* instruction decoding, emulate all instructions except MOVEM and
* things like MOVE SR,EA or RESET
* debugging functions: disasm, dumpstate
* v0.1: 950228
* exceptions, almost all instructions, bug fixes
* v0.2: 950305
* more bug fixes in interrupt code. STOP implemented. Bugs in
* GenerateDecTab() fixed.
* v0.3: 950306
* bug fixes: ROR shouldn't set X flag. SWAP didn't set any flags.
* GenerateDecTab() created wrong sizes for all shift instructions
* v0.4: 950309
* yet another bug in the shifting instructions part of GenerateDecTab
* v0.5: 930311
* lots of bug fixes. Sign extension is probably correct now.
* Multiplication corrected. None of these bugs affected the Kickstart.
*
* (c) 1995 Bernd Schmidt
*
*/
#include <iostream>
using namespace std;
#include <iomanip>
#include <assert.h>
#include <string.h>
#include <stdlib.h>
#include "amiga.h"
#include "memory.h"
#include "custom.h"
#include "cpu.h"
enum amodes {
Dreg, Areg, Aind, Aipi, Apdi, Ad16, Ad8r,
absw, absl, PC16, PC8r, imm, imm3, ill2, ill3
};
class addr_mode {
public:
amodes mode;
UBYTE reg;
addr_mode(int=0,int=0);
};
addr_mode::addr_mode(int m,int r)
{
assert ((r & 7) == r);
assert ((m & 7) == m);
if (m == 7) mode = (amodes)(absw + r);
else mode = (amodes)m;
reg = r;
}
enum eatypes {
RegD, RegA, Addr, EAIM
};
struct effadr {
public:
ULONG addr;
eatypes type;
ULONG szmask;
};
struct instr_params {
addr_mode src,dest;
ULONG mask;
UWORD clogs;
};
typedef void instr_result;
typedef instr_result (*instr_func)(const instr_params &);
struct I_dec_tab_entry {
instr_func execfunc;
instr_params params;
I_dec_tab_entry() { execfunc = NULL; }
};
static I_dec_tab_entry instr_dectab[65536];
static void GenerateDecTab();
void MC68000_init()
{
GenerateDecTab();
};
typedef int flagtype; // faster than char ?
static struct {
ULONG d[8];
CPTR a[8],usp;
UWORD sr;
flagtype t,s,x,n,z,v,c,stopped;
int intmask;
ULONG pc;
} regs;
static ULONG sizemask(const int sz)
{
switch(sz){
case 0: return 0xff;
case 1: return 0xffff;
case 2: return 0xffffffff;
default: abort();
}
}
static inline int mask2len(const ULONG mask)
{
if (mask == 0xff) return 1;
if (mask == 0xffff) return 2;
return 4;
}
static inline int mask2shift(const ULONG mask)
{
if (mask == 0xff) return 7;
if (mask == 0xffff) return 15;
return 31;
}
static inline ULONG ExtendWord(const ULONG v)
{
return (LONG)(WORD)(v);
}
static inline ULONG ExtendByte(const ULONG v)
{
return (LONG)(BYTE)(v);
}
static inline ULONG Extend(const ULONG v,const ULONG mask)
{
switch(mask){
case 0xff:
return (LONG)(BYTE)v;
case 0xffff:
return (LONG)(WORD)v;
default:
return v;
}
}
static inline UWORD nextiword()
{
UWORD r = mem.get_word(regs.pc);
regs.pc += 2;
return r;
}
static inline ULONG nextilong()
{
ULONG r = (mem.get_word(regs.pc) << 16) + mem.get_word(regs.pc+2);
regs.pc += 4;
return r;
}
static effadr GetEA(const addr_mode &a, const ULONG mask)
{
effadr ea;
UWORD dp;
BYTE disp8;
int r;
ULONG dispreg;
ea.szmask = mask;
switch(a.mode){
case Dreg:
ea.addr = a.reg; ea.type = RegD; break;
case Areg:
ea.addr = a.reg; ea.type = RegA; break;
case Aind:
ea.addr = regs.a[a.reg]; ea.type = Addr; break;
case Aipi:
ea.addr = regs.a[a.reg]; regs.a[a.reg] += mask2len(mask);
ea.type = Addr; break;
case Apdi:
ea.addr = regs.a[a.reg] -= mask2len(mask); ea.type = Addr; break;
case Ad16:
ea.addr = regs.a[a.reg] + (WORD)nextiword(); // cast for signed rel. values
ea.type = Addr; break;
case Ad8r:
dp = nextiword();
disp8 = dp & 0xFF;
r = (dp & 0x7000) >> 12;
dispreg = dp & 0x8000 ? regs.a[r] : regs.d[r];
if (!(dp & 0x800)) dispreg = ExtendWord(dispreg);
ea.addr = regs.a[a.reg] + disp8 + dispreg;
ea.type = Addr; break;
case PC16:
ea.addr = regs.pc;
ea.addr += (WORD)nextiword(); // cast for signed rel. values
ea.type = Addr; break;
case PC8r:
ea.addr = regs.pc;
dp = nextiword();
disp8 = dp & 0xFF;
r = (dp & 0x7000) >> 12;
dispreg = dp & 0x8000 ? regs.a[r] : regs.d[r];
if (!(dp & 0x800)) dispreg = ExtendWord(dispreg);
ea.addr += disp8 + dispreg;
ea.type = Addr; break;
case absw:
ea.type = Addr;
ea.addr = nextiword();
break;
case absl:
ea.type = Addr;
ea.addr = nextilong();
break;
case imm:
switch(mask){
case 0xff:
ea.addr = ExtendByte(nextiword()); ea.type = EAIM; break;
case 0xffff:
ea.addr = ExtendWord(nextiword()); ea.type = EAIM; break;
case 0xffffffff:
ea.addr = nextilong(); ea.type = EAIM; break;
}
break;
case imm3:
ea.addr = a.reg; ea.type = EAIM; break;
default:
abort(); // FIXME
}
return ea;
}
static effadr MGetEA(const addr_mode &a, const ULONG mask)
{
effadr ea;
UWORD dp;
BYTE disp8;
int r;
ULONG dispreg;
ea.szmask = mask;
switch(a.mode){
case Aind: case Aipi: case Apdi:
ea.addr = regs.a[a.reg]; ea.type = Addr; break;
case Ad16:
ea.addr = regs.a[a.reg] + (WORD)nextiword(); // cast for signed rel. values
ea.type = Addr; break;
case Ad8r:
dp = nextiword();
disp8 = dp & 0xFF;
r = (dp & 0x7000) >> 12;
dispreg = dp & 0x8000 ? regs.a[r] : regs.d[r];
if (!(dp & 0x800)) dispreg = ExtendWord(dispreg);
ea.addr = regs.a[a.reg] + disp8 + dispreg;
ea.type = Addr; break;
case PC16:
ea.addr = regs.pc;
ea.addr += (WORD)nextiword(); // cast for signed rel. values
ea.type = Addr; break;
case PC8r:
ea.addr = regs.pc;
dp = nextiword();
disp8 = dp & 0xFF;
r = (dp & 0x7000) >> 12;
dispreg = dp & 0x8000 ? regs.a[r] : regs.d[r];
if (!(dp & 0x800)) dispreg = ExtendWord(dispreg);
ea.addr += disp8 + dispreg;
ea.type = Addr; break;
case absw:
ea.type = Addr;
ea.addr = nextiword();
break;
case absl:
ea.type = Addr;
ea.addr = nextilong();
break;
default:
abort(); // FIXME
}
return ea;
}
static void MCompleteEAFromRL(effadr &ea, const addr_mode &a, ULONG mask, UWORD bitmask)
{
int bitcnt = 0;
for(int i=0;i<16;i++) {
bitcnt += bitmask & 1;
bitmask >>= 1;
}
switch(a.mode){
case Aipi:
abort(); break;
case Apdi:
ea.addr = regs.a[a.reg] -= bitcnt * mask2len(mask); break;
default: break;
}
}
static void MCompleteEAToRL(effadr &ea, const addr_mode &a, ULONG mask, UWORD bitmask)
{
int bitcnt = 0;
for(int i=0;i<16;i++) {
bitcnt += bitmask & 1;
bitmask >>= 1;
}
switch(a.mode){
case Aipi:
regs.a[a.reg] = ea.addr; break;
case Apdi:
abort(); break;
default: break;
}
}
static ULONG RetrieveEA(const effadr &ea)
{
switch(ea.type){
case Addr:
return ea.addr;
default:
abort(); // FIXME
}
}
static ULONG GetFromEA(const effadr &ea)
{
switch(ea.type) {
case RegD:
return Extend(regs.d[ea.addr],ea.szmask);
case RegA:
return Extend(regs.a[ea.addr],ea.szmask);
case Addr:
switch(ea.szmask){
case 0xff:
return ExtendByte(mem.get_byte(ea.addr));
case 0xffff:
return ExtendWord(mem.get_word(ea.addr));
default: // long
return (mem.get_word(ea.addr) << 16) + mem.get_word(ea.addr+2);
}
case EAIM:
return ea.addr;
}
}
static void StoreToEA(const effadr &ea, const ULONG value)
{
switch(ea.type){
case RegD:
regs.d[ea.addr] &= ~ea.szmask; regs.d[ea.addr] |= (value & ea.szmask);
break;
case RegA:
regs.a[ea.addr] = value;
// if (ea.szmask == 0xffff) regs.a[ea.addr] = ExtendWord(regs.a[ea.addr]);
break;
case Addr:
switch(ea.szmask){
case 0xff:
mem.put_byte(ea.addr,value);
break;
case 0xffff:
mem.put_word(ea.addr,value);
break;
default: // long
mem.put_word(ea.addr,value >> 16);
mem.put_word(ea.addr+2, value & 0xffff);
}
break;
default:
cout << hex << regs.pc;
abort(); // FIXME
}
}
static effadr ShowEA(addr_mode a,ULONG mask)
{
effadr ea;
UWORD dp;
BYTE disp8;
WORD disp16;
int r;
ULONG dispreg;
cout << setw(1) << setfill('0');
ea.szmask = mask;
switch(a.mode){
case Dreg:
ea.addr = a.reg; ea.type = RegD;
cout << "D" << (int)a.reg;
break;
case Areg:
ea.addr = a.reg; ea.type = RegA;
cout << "A" << (int)a.reg;
break;
case Aind:
ea.addr = regs.a[a.reg]; ea.type = Addr;
cout << "(A" << (int)a.reg << ")";
break;
case Aipi:
ea.addr = regs.a[a.reg];
ea.type = Addr;
cout << "(A" << (int)a.reg << ")+";
break;
case Apdi:
ea.addr = regs.a[a.reg] - mask2len(mask); ea.type = Addr;
cout << "-(A" << (int)a.reg << ")";
break;
case Ad16:
disp16 = nextiword();
ea.addr = regs.a[a.reg] + (WORD)disp16;
ea.type = Addr;
cout << "(A" << (int)a.reg << ",$" << hex << setw(8) << disp16 << ") == $"
<< ea.addr << dec;
break;
case Ad8r:
dp = nextiword();
disp8 = dp & 0xFF;
r = (dp & 0x7000) >> 12;
dispreg = dp & 0x8000 ? regs.a[r] : regs.d[r];
if (!(dp & 0x800)) dispreg = ExtendWord(dispreg);
ea.addr = regs.a[a.reg] + disp8 + dispreg;
ea.type = Addr;
cout << "(A" << (int)a.reg << "," << ((dp & 0x8000) ? "A" : "D") << (int)r
<< ",$" << hex << (int)disp8 << ") == $" << ea.addr
<< dec;
break;
case PC16:
ea.addr = regs.pc;
disp16 = nextiword();
ea.addr += (WORD)disp16; // cast for signed rel. values
ea.type = Addr;
cout << "(PC" << ",$" << hex << setw(8) << disp16 << ") == $" << ea.addr
<< dec;
break;
case PC8r:
ea.addr = regs.pc;
dp = nextiword();
disp8 = dp & 0xFF;
r = (dp & 0x7000) >> 12;
dispreg = dp & 0x8000 ? regs.a[r] : regs.d[r];
if (!(dp & 0x800)) dispreg = ExtendWord(dispreg);
ea.addr += disp8 + dispreg;
ea.type = Addr;
cout << "(PC" << "," << ((dp & 0x8000) ? "A" : "D") << (int)r
<< ",$" << hex << (int)disp8 << ") == $" << ea.addr
<< dec;
break;
case absw:
ea.type = Addr;
ea.addr = nextiword();
cout << "$" << hex << ea.addr << dec;
break;
case absl:
ea.type = Addr;
ea.addr = nextilong();
cout << "$" << hex << ea.addr << dec;
break;
case imm:
switch(mask){
case 0xff:
ea.addr = nextiword() & 0xff; ea.type = EAIM; break;
case 0xffff:
ea.addr = nextiword(); ea.type = EAIM; break;
case 0xffffffff:
ea.addr = nextilong(); ea.type = EAIM; break;
}
cout << "#$" << hex << ea.addr << dec;
break;
case imm3:
ea.addr = a.reg; ea.type = EAIM;
cout << "#$" << hex << ea.addr << dec;
break;
default:
abort(); // FIXME
}
return ea;
}
static inline void setflags_add(const ULONG src, const ULONG oldv,
const ULONG newv)
{
int s = src >> 31;
int o = oldv >> 31;
int n = newv >> 31;
regs.z = newv == 0;
regs.c = regs.x = (s && o) || (!n && (o || s));
regs.n = n;
regs.v = ((s && o && !n) || (!s && !o && n));
}
static inline void setflags_sub(const ULONG src, const ULONG oldv,
const ULONG newv)
{
int s = src >> 31;
int o = oldv >> 31;
int n = newv >> 31;
regs.z = newv == 0;
regs.c = regs.x = (s && !o) || (n && (!o || s));
regs.n = n;
regs.v = ((!s && o && !n) || (s && !o && n));
}
static inline void setflags_cmp(const ULONG src, const ULONG oldv,
const ULONG newv)
{
int sh = 31; //mask2shift(mask);
int s = (src >> sh); // & 1;
int o = (oldv >> sh); // & 1;
int n = newv >> sh;
regs.z = newv == 0;
regs.c = (s && !o) || (n && (!o || s));
regs.n = n;
regs.v = ((!s && o && !n) || (s && !o && n));
}
static inline void setflags_logical(ULONG newv, const ULONG mask)
{
newv &= mask;
regs.z = newv == 0;
regs.n = newv >> mask2shift(mask);
regs.v = regs.c = 0;
}
static bool cctrue(const int cc)
{
switch(cc){
case 0: return true; // T
case 1: return false; // F
case 2: return !regs.c && !regs.z; // HI
case 3: return regs.c || regs.z; // LS
case 4: return !regs.c; // CC
case 5: return regs.c; // CS
case 6: return !regs.z; // NE
case 7: return regs.z; // EQ
case 8: return !regs.v; // VC
case 9: return regs.v; // VV
case 10:return !regs.n; // PL
case 11:return regs.n; // MI
case 12:return regs.n == regs.v; // GE
case 13:return regs.n != regs.v; // LT
case 14:return !regs.z && (regs.n == regs.v);// GT
case 15:return regs.z || (regs.n != regs.v); // LE
}
abort();
return 0;
}
static void SuperState()
{
if (!regs.s){
regs.s = 1;
regs.t = 0;
CPTR temp = regs.usp;
regs.usp = regs.a[7];
regs.a[7] = temp;
}
}
static void UserState()
{
if (regs.s){
regs.s = 0;
// regs.t = 0;
CPTR temp = regs.usp;
regs.usp = regs.a[7];
regs.a[7] = temp;
}
}
static void MakeSR()
{
regs.sr = (regs.t << 15) | (regs.s << 13) | (regs.intmask << 8)
| (regs.x << 4) | (regs.n << 3) | (regs.z << 2) | (regs.v << 1)
| regs.c;
}
static void MakeFromSR()
{
int olds = regs.s;
regs.t = (regs.sr >> 15) & 1;
regs.s = (regs.sr >> 13) & 1;
regs.intmask = (regs.sr >> 8) & 7;
regs.x = (regs.sr >> 4) & 1;
regs.n = (regs.sr >> 3) & 1;
regs.z = (regs.sr >> 2) & 1;
regs.v = (regs.sr >> 1) & 1;
regs.c = regs.sr & 1;
if (olds != regs.s) {
cout << "Mode switch!\n";
regs.s = olds;
if (regs.s) UserState(); else SuperState();
}
}
static void Exception(int nr, int newimask=-1)
{
MakeSR();
SuperState();
if (newimask != -1) regs.intmask = newimask;
addr_mode pda7(Apdi,7);
effadr lea = GetEA(pda7,0xffffffff);
effadr wea = GetEA(pda7,0xffff);
StoreToEA(wea,regs.sr);
StoreToEA(lea,regs.pc);
regs.pc = (mem.get_word(4*nr) << 16) + mem.get_word(4*nr+2);
}
static void Interrupt(int nr)
{
assert(nr < 8 && nr >= 0);
// regs.intmask = nr;
Exception(nr+24,nr);
}
/*
* instruction emulations
*/
static instr_result INST_ILLG(const instr_params &)
{
regs.pc -= 2;
Exception(4);
}
static instr_result INST_NIMP(const instr_params &p)
{
cout << "unimplemented (020 ??) instruction: "
<< mem.get_word(regs.pc-2) << "\n";
INST_ILLG(p);
}
static instr_result INST_OR(const instr_params &p)
{
effadr src = GetEA(p.src, p.mask);
ULONG srcv = GetFromEA(src);
effadr dst = GetEA(p.dest, p.mask);
ULONG dstv = GetFromEA(dst);
dstv |= srcv;
setflags_logical(dstv, p.mask);
StoreToEA(dst,dstv);
}
static instr_result INST_AND(const instr_params &p)
{
effadr src = GetEA(p.src, p.mask);
ULONG srcv = GetFromEA(src);
effadr dst = GetEA(p.dest, p.mask);
ULONG dstv = GetFromEA(dst);
dstv &= srcv;
setflags_logical(dstv, p.mask);
StoreToEA(dst,dstv);
}
static instr_result INST_EOR(const instr_params &p)
{
effadr src = GetEA(p.src, p.mask);
ULONG srcv = GetFromEA(src);
effadr dst = GetEA(p.dest, p.mask);
ULONG dstv = GetFromEA(dst);
dstv ^= srcv;
setflags_logical(dstv, p.mask);
StoreToEA(dst,dstv);
}
static instr_result INST_CMP(const instr_params &p)
{
effadr src = GetEA(p.src, p.mask);
ULONG srcv = GetFromEA(src);
effadr dst = GetEA(p.dest, p.mask);
ULONG dstv = GetFromEA(dst);
ULONG newv = dstv - srcv;
setflags_cmp(srcv, dstv, newv);
}
static instr_result INST_ADD(const instr_params &p)
{
effadr src = GetEA(p.src, p.mask);
ULONG srcv = GetFromEA(src);
effadr dst = GetEA(p.dest, p.mask);
ULONG dstv = GetFromEA(dst);
ULONG newv = dstv + srcv;
setflags_add(srcv, dstv, newv);
StoreToEA(dst,newv);
}
static instr_result INST_SUB(const instr_params &p)
{
effadr src = GetEA(p.src, p.mask);
ULONG srcv = GetFromEA(src);
effadr dst = GetEA(p.dest, p.mask);
ULONG dstv = GetFromEA(dst);
ULONG newv = dstv - srcv;
setflags_sub(srcv, dstv, newv);
StoreToEA(dst,newv);
}
static instr_result INST_ADDX(const instr_params &p)
{
effadr src = GetEA(p.src, p.mask);
ULONG srcv = GetFromEA(src);
effadr dst = GetEA(p.dest, p.mask);
ULONG dstv = GetFromEA(dst);
ULONG newv = dstv + srcv + regs.x;
setflags_add(srcv, dstv, newv);
StoreToEA(dst,newv);
}
static instr_result INST_SUBX(const instr_params &p)
{
effadr src = GetEA(p.src, p.mask);
ULONG srcv = GetFromEA(src);
effadr dst = GetEA(p.dest, p.mask);
ULONG dstv = GetFromEA(dst);
ULONG newv = dstv - srcv - regs.x;
setflags_sub(srcv, dstv, newv);
StoreToEA(dst,newv);
}
static instr_result INST_ADDA(const instr_params &p)
{
effadr src = GetEA(p.src, p.mask);
ULONG srcv = GetFromEA(src);
effadr dst = GetEA(p.dest, 0xffffffff);
ULONG dstv = GetFromEA(dst);
// if (src.szmask == 0xffff) srcv = ExtendWord(srcv);
StoreToEA(dst,dstv + srcv);
}
static instr_result INST_SUBA(const instr_params &p)
{
effadr src = GetEA(p.src, p.mask);
ULONG srcv = GetFromEA(src);
effadr dst = GetEA(p.dest, 0xffffffff);
ULONG dstv = GetFromEA(dst);
// if (src.szmask == 0xffff) srcv = ExtendWord(srcv);
StoreToEA(dst,dstv - srcv);
}
static instr_result INST_CMPA(const instr_params &p)
{
effadr src = GetEA(p.src, p.mask);
ULONG srcv = GetFromEA(src);
effadr dst = GetEA(p.dest, 0xffffffff);
ULONG dstv = GetFromEA(dst);
ULONG newv = dstv - srcv;
setflags_cmp(srcv, dstv, newv);
}
static instr_result INST_CHK(const instr_params &p)
{
cout << "CHK occurred\n";
INST_ILLG(p); // FIXME
}
static instr_result INST_EXGL(const instr_params &p)
{
effadr src = GetEA(p.src, p.mask);
ULONG srcv = GetFromEA(src);
effadr dst = GetEA(p.dest, p.mask);
ULONG dstv = GetFromEA(dst);
StoreToEA(dst,srcv);
StoreToEA(src,dstv);
}
static instr_result INST_LEA(const instr_params &p)
{
effadr src = GetEA(p.src, p.mask);
effadr dst = GetEA(p.dest, p.mask);
StoreToEA(dst,RetrieveEA(src));
}
static instr_result INST_MOVE(const instr_params &p)
{
effadr src = GetEA(p.src, p.mask);
ULONG srcv = GetFromEA(src);
effadr dst = GetEA(p.dest, p.mask);
setflags_logical(srcv,p.mask);
StoreToEA(dst,srcv);
}
static instr_result INST_MOVEQ(const instr_params &p)
{
effadr src = GetEA(p.src, p.mask);
effadr dst = GetEA(p.dest, p.mask);
ULONG srcv = ExtendByte(GetFromEA(src));
setflags_logical(srcv,p.mask);
StoreToEA(dst,srcv);
}
static instr_result INST_MOVEA(const instr_params &p)
{
effadr src = GetEA(p.src, p.mask);
ULONG srcv = GetFromEA(src);
effadr dst = GetEA(p.dest, p.mask);
StoreToEA(dst,srcv);
}
static instr_result INST_BTST(const instr_params &p)
{
effadr src = GetEA(p.src, p.mask);
ULONG srcv = GetFromEA(src);
effadr dst = GetEA(p.dest, p.dest.mode == Dreg ? 0xffffffff : 0xff);
ULONG dstv = GetFromEA(dst);
if (p.dest.mode == Dreg) {
srcv &= 31;
} else {
srcv &= 7;
}
regs.z = !(dstv & (1 << srcv));
}
static instr_result INST_BCLR(const instr_params &p)
{
effadr src = GetEA(p.src, p.mask);
ULONG srcv = GetFromEA(src);
effadr dst = GetEA(p.dest, p.dest.mode == Dreg ? 0xffffffff : 0xff);
ULONG dstv = GetFromEA(dst);
if (p.dest.mode == Dreg) {
srcv &= 31;
} else {
srcv &= 7;
}
regs.z = !(dstv & (1 << srcv));
StoreToEA(dst,dstv & ~(1 << srcv));
}
static instr_result INST_BSET(const instr_params &p)
{
effadr src = GetEA(p.src, p.mask);
ULONG srcv = GetFromEA(src);
effadr dst = GetEA(p.dest, p.dest.mode == Dreg ? 0xffffffff : 0xff);
ULONG dstv = GetFromEA(dst);
if (p.dest.mode == Dreg) {
srcv &= 31;
} else {
srcv &= 7;
}
regs.z = !(dstv & (1 << srcv));
StoreToEA(dst,dstv | (1 << srcv));
}
static instr_result INST_BCHG(const instr_params &p)
{
effadr src = GetEA(p.src, p.mask);
ULONG srcv = GetFromEA(src);
effadr dst = GetEA(p.dest, p.dest.mode == Dreg ? 0xffffffff : 0xff);
ULONG dstv = GetFromEA(dst);
if (p.dest.mode == Dreg) {
srcv &= 31;
} else {
srcv &= 7;
}
regs.z = !(dstv & (1 << srcv));
StoreToEA(dst,dstv ^ (1 << srcv));
}
static instr_result INST_NEG(const instr_params &p)
{
effadr ea = GetEA(p.src, p.mask);
ULONG val = GetFromEA(ea);
ULONG newv = -val;
setflags_sub(val, 0, newv);
StoreToEA(ea,newv);
}
static instr_result INST_NEGX(const instr_params &p)
{
effadr ea = GetEA(p.src, p.mask);
ULONG val = GetFromEA(ea);
ULONG newv = -val-regs.x;
setflags_sub(val, 0, newv);
StoreToEA(ea,newv);
}
static instr_result INST_NOT(const instr_params &p)
{
effadr ea = GetEA(p.src, p.mask);
ULONG val = GetFromEA(ea);
ULONG newv = ~val;
setflags_logical(newv,p.mask);
StoreToEA(ea,newv);
}
static instr_result INST_CLR(const instr_params &p)
{
effadr ea = GetEA(p.src, p.mask);
ULONG val = GetFromEA(ea); // not a bug, a feature!
ULONG newv = 0;
setflags_logical(newv,p.mask);
StoreToEA(ea,newv);
}
static instr_result INST_TST(const instr_params &p)
{
effadr ea = GetEA(p.src, p.mask);
ULONG val = GetFromEA(ea);
setflags_logical(val,p.mask);
}
static instr_result INST_SWAP(const instr_params &p)
{
effadr ea = GetEA(p.src, p.mask);
ULONG val = GetFromEA(ea);
val = (val >> 16) | (val << 16);
StoreToEA(ea, val);
setflags_logical(val,p.mask);
}
static instr_result INST_EXTW(const instr_params &p)
{
effadr ea = GetEA(p.src, p.mask);
ULONG val = GetFromEA(ea);
StoreToEA(ea, ExtendByte(val));
}
static instr_result INST_EXTL(const instr_params &p)
{
effadr ea = GetEA(p.src, p.mask);
ULONG val = GetFromEA(ea);
StoreToEA(ea, ExtendWord(val));
}
static instr_result INST_Scc(const instr_params &p)
{
effadr ea = GetEA(p.src, p.mask);
StoreToEA(ea,cctrue(p.dest.reg) ? 0xff : 0);
}
static instr_result INST_ABCD(const instr_params &p)
{
abort(); // FIXME
}
static instr_result INST_SBCD(const instr_params &p)
{
abort(); // FIXME
}
static instr_result INST_NBCD(const instr_params &p)
{
abort(); // FIXME
}
static instr_result INST_NOP(const instr_params &)
{
// :-D
}
static instr_result INST_RESET(const instr_params &)
{
customreset();
}
static instr_result INST_STOP(const instr_params &p)
{
if ((p.mask != 0xff) && !regs.s) {
regs.pc -= 2;
Exception(8);
} else {
effadr ea = GetEA(p.src, p.mask);
regs.sr = GetFromEA(ea);
MakeFromSR();
regs.stopped = 1;
}
}
static instr_result INST_TRAPV(const instr_params &)
{
if (regs.v) Exception(7);
}
static instr_result INST_TRAP(const instr_params &p)
{
UWORD val = GetFromEA(GetEA(p.src,p.mask));
Exception(val+32);
}
static instr_result INST_BSRB(const instr_params &p)
{
effadr ea = GetEA(p.src, p.mask);
BYTE offset = GetFromEA(ea);
addr_mode pda7(Apdi,7);