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Added some PDP-11 opcodes I missed (JMP and SWAB)

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This commit is contained in:
Jeff 2016-09-30 15:27:53 -07:00 • committed by Jeff Parsons
commit 0e0dcb29ec
3 changed files with 268 additions and 203 deletions
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173
modules/pdp11/lib/cpuops.js
View file

@ -155,7 +155,7 @@ PDP11.fnASRB = function(src, dst)
PDP11.fnBIC = function(src, dst)
{
var result = dst & ~src;
this.updateNZFlags(result);
this.updateNZVFlags(result);
return result;
};
@ -170,7 +170,7 @@ PDP11.fnBIC = function(src, dst)
PDP11.fnBICB = function(src, dst)
{
var result = dst & ~src;
this.updateNZFlags(result << 8);
this.updateNZVFlags(result << 8);
return result;
};
@ -185,7 +185,7 @@ PDP11.fnBICB = function(src, dst)
PDP11.fnBIS = function(src, dst)
{
var result = dst | src;
this.updateNZFlags(result);
this.updateNZVFlags(result);
return result;
};
@ -200,7 +200,7 @@ PDP11.fnBIS = function(src, dst)
PDP11.fnBISB = function(src, dst)
{
var result = dst | src;
this.updateNZFlags(result << 8);
this.updateNZVFlags(result << 8);
return result;
};
@ -420,6 +420,24 @@ PDP11.fnSUBB = function(src, dst)
return result & 0xff;
};
/**
* fnSWAB(src, dst)
*
* @this {CPUStatePDP11}
* @param {number} src (ignored)
* @param {number} dst
* @return {number} (dst with bytes swapped)
*/
PDP11.fnSWAB = function(src, dst)
{
var result = (dst << 8) | (dst >> 8);
/*
* N and Z are based on the low byte of the result, which is the same as the high byte of dst.
*/
this.updateNZVCFlags(dst & 0xff00);
return result & 0xffff;
};
/**
* fnXOR(src, dst)
*
@ -431,7 +449,7 @@ PDP11.fnSUBB = function(src, dst)
PDP11.fnXOR = function(src, dst)
{
var result = dst ^ src;
this.updateNZFlags(result);
this.updateNZVFlags(result);
return result & 0xffff;
};
@ -444,7 +462,7 @@ PDP11.fnXOR = function(src, dst)
PDP11.opADC = function(opCode)
{
this.updateWordByMode(opCode, this.getCF()? 1 : 0, PDP11.fnADD);
this.nStepCycles -= 1;
this.nStepCycles -= (this.dstMode? (8 + 1) : (2 + 1) + (this.dstReg == 7? 2 : 0));
};
/**
@ -456,7 +474,7 @@ PDP11.opADC = function(opCode)
PDP11.opADCB = function(opCode)
{
this.updateByteByMode(opCode, this.getCF()? 1 : 0, PDP11.fnADDB);
this.nStepCycles -= 1;
this.nStepCycles -= (this.dstMode? (8 + 1) : (2 + 1) + (this.dstReg == 7? 2 : 0));
};
/**
@ -468,7 +486,7 @@ PDP11.opADCB = function(opCode)
PDP11.opADD = function(opCode)
{
this.updateWordByMode(opCode, this.readWordByMode(opCode >> PDP11.SRCMODE.SHIFT), PDP11.fnADD);
this.nStepCycles -= (this.dstMode? (8 + 1) + (this.srcReg && this.dstReg >= 6? 1 : 0) : (this.srcMode? (3 + 2) : (2 + 1) + (this.dstReg == 7? 2 : 0)));
this.nStepCycles -= (this.dstMode? (8 + 1) + (this.srcReg && this.dstReg >= 6? 1 : 0) : (this.srcMode? (3 + 2) : (2 + 1)) + (this.dstReg == 7? 2 : 0));
};
/**
@ -557,7 +575,7 @@ PDP11.opASHC = function(opCode)
PDP11.opASL = function(opCode)
{
this.updateWordByMode(opCode, 0, PDP11.fnASL);
this.nStepCycles -= 1;
this.nStepCycles -= (this.dstMode? (8 + 1) : (2 + 1) + (this.dstReg == 7? 2 : 0));
};
/**
@ -569,7 +587,7 @@ PDP11.opASL = function(opCode)
PDP11.opASLB = function(opCode)
{
this.updateByteByMode(opCode, 0, PDP11.fnASLB);
this.nStepCycles -= 1;
this.nStepCycles -= (this.dstMode? (8 + 1) : (2 + 1) + (this.dstReg == 7? 2 : 0));
};
/**
@ -629,7 +647,7 @@ PDP11.opBCS = function(opCode)
PDP11.opBIC = function(opCode)
{
this.updateWordByMode(opCode, this.readWordByMode(opCode >> PDP11.SRCMODE.SHIFT), PDP11.fnBIC);
this.nStepCycles -= 1;
this.nStepCycles -= (this.dstMode? (8 + 1) + (this.srcReg && this.dstReg >= 6? 1 : 0) : (this.srcMode? (3 + 2) : (2 + 1)) + (this.dstReg == 7? 2 : 0));
};
/**
@ -641,7 +659,7 @@ PDP11.opBIC = function(opCode)
PDP11.opBICB = function(opCode)
{
this.updateByteByMode(opCode, this.readByteByMode(opCode >> PDP11.SRCMODE.SHIFT), PDP11.fnBICB);
this.nStepCycles -= 1;
this.nStepCycles -= (this.dstMode? (8 + 1) + (this.srcReg && this.dstReg >= 6? 1 : 0) : (this.srcMode? (3 + 2) : (2 + 1)) + (this.dstReg == 7? 2 : 0));
};
/**
@ -653,7 +671,7 @@ PDP11.opBICB = function(opCode)
PDP11.opBIS = function(opCode)
{
this.updateWordByMode(opCode, this.readWordByMode(opCode >> PDP11.SRCMODE.SHIFT), PDP11.fnBIS);
this.nStepCycles -= 1;
this.nStepCycles -= (this.dstMode? (8 + 1) + (this.srcReg && this.dstReg >= 6? 1 : 0) : (this.srcMode? (3 + 2) : (2 + 1)) + (this.dstReg == 7? 2 : 0));
};
/**
@ -665,7 +683,7 @@ PDP11.opBIS = function(opCode)
PDP11.opBISB = function(opCode)
{
this.updateByteByMode(opCode, this.readByteByMode(opCode >> PDP11.SRCMODE.SHIFT), PDP11.fnBISB);
this.nStepCycles -= 1;
this.nStepCycles -= (this.dstMode? (8 + 1) + (this.srcReg && this.dstReg >= 6? 1 : 0) : (this.srcMode? (3 + 2) : (2 + 1)) + (this.dstReg == 7? 2 : 0));
};
/**
@ -676,8 +694,8 @@ PDP11.opBISB = function(opCode)
*/
PDP11.opBIT = function(opCode)
{
this.updateNZFlags(this.readWordByMode(opCode >> PDP11.SRCMODE.SHIFT) & this.readWordByMode(opCode));
this.nStepCycles -= 1;
this.updateNZVFlags(this.readWordByMode(opCode >> PDP11.SRCMODE.SHIFT) & this.readWordByMode(opCode));
this.nStepCycles -= (this.dstMode? (3 + 1) + (this.srcReg && this.dstReg >= 6? 1 : 0) : (this.srcMode? (3 + 1) : (2 + 1)) + (this.dstReg == 7? 2 : 0));
};
/**
@ -688,8 +706,8 @@ PDP11.opBIT = function(opCode)
*/
PDP11.opBITB = function(opCode)
{
this.updateNZFlags((this.readByteByMode(opCode >> PDP11.SRCMODE.SHIFT) & this.readByteByMode(opCode)) << 8);
this.nStepCycles -= 1;
this.updateNZVFlags((this.readByteByMode(opCode >> PDP11.SRCMODE.SHIFT) & this.readByteByMode(opCode)) << 8);
this.nStepCycles -= (this.dstMode? (3 + 1) + (this.srcReg && this.dstReg >= 6? 1 : 0) : (this.srcMode? (3 + 1) : (2 + 1)) + (this.dstReg == 7? 2 : 0));
};
/**
@ -869,7 +887,7 @@ PDP11.opBVS = function(opCode)
PDP11.opCLR = function(opCode)
{
this.updateAllFlags(this.writeWordByMode(opCode, 0));
this.nStepCycles -= 1;
this.nStepCycles -= (this.dstMode? (8 + 1) : (2 + 1) + (this.dstReg == 7? 2 : 0));
};
/**
@ -881,7 +899,7 @@ PDP11.opCLR = function(opCode)
PDP11.opCLRB = function(opCode)
{
this.updateAllFlags(this.writeByteByMode(opCode, 0));
this.nStepCycles -= 1;
this.nStepCycles -= (this.dstMode? (8 + 1) : (2 + 1) + (this.dstReg == 7? 2 : 0));
};
/**
@ -963,7 +981,7 @@ PDP11.opCMP = function(opCode)
* we must reverse the order of the src and dst parameters.
*/
this.updateSubFlags(result, dst, src);
this.nStepCycles -= 1;
this.nStepCycles -= (this.dstMode? (3 + 1) + (this.srcReg && this.dstReg >= 6? 1 : 0) : (this.srcMode? (3 + 1) : (2 + 1)) + (this.dstReg == 7? 2 : 0));
};
/**
@ -982,7 +1000,7 @@ PDP11.opCMPB = function(opCode)
* we must reverse the order of the src and dst parameters.
*/
this.updateSubFlags(result, dst, src);
this.nStepCycles -= 1;
this.nStepCycles -= (this.dstMode? (3 + 1) + (this.srcReg && this.dstReg >= 6? 1 : 0) : (this.srcMode? (3 + 1) : (2 + 1)) + (this.dstReg == 7? 2 : 0));
};
/**
@ -994,7 +1012,7 @@ PDP11.opCMPB = function(opCode)
PDP11.opCOM = function(opCode)
{
this.updateWordByMode(opCode, 0, PDP11.fnCOM);
this.nStepCycles -= 1;
this.nStepCycles -= (this.dstMode? (8 + 1) : (2 + 1) + (this.dstReg == 7? 2 : 0));
};
/**
@ -1006,7 +1024,7 @@ PDP11.opCOM = function(opCode)
PDP11.opCOMB = function(opCode)
{
this.updateByteByMode(opCode, 0, PDP11.fnCOMB);
this.nStepCycles -= 1;
this.nStepCycles -= (this.dstMode? (8 + 1) : (2 + 1) + (this.dstReg == 7? 2 : 0));
};
/**
@ -1018,7 +1036,7 @@ PDP11.opCOMB = function(opCode)
PDP11.opDEC = function(opCode)
{
this.updateWordByMode(opCode, 1, PDP11.fnDEC);
this.nStepCycles -= 1;
this.nStepCycles -= (this.dstMode? (8 + 1) : (2 + 1) + (this.dstReg == 7? 2 : 0));
};
/**
@ -1030,7 +1048,7 @@ PDP11.opDEC = function(opCode)
PDP11.opDECB = function(opCode)
{
this.updateByteByMode(opCode, 1, PDP11.fnDECB);
this.nStepCycles -= 1;
this.nStepCycles -= (this.dstMode? (8 + 1) : (2 + 1) + (this.dstReg == 7? 2 : 0));
};
/**
@ -1111,7 +1129,7 @@ PDP11.opHALT = function(opCode)
PDP11.opINC = function(opCode)
{
this.updateWordByMode(opCode, 1, PDP11.fnINC);
this.nStepCycles -= 1;
this.nStepCycles -= (this.dstMode? (8 + 1) : (2 + 1) + (this.dstReg == 7? 2 : 0));
};
/**
@ -1123,7 +1141,7 @@ PDP11.opINC = function(opCode)
PDP11.opINCB = function(opCode)
{
this.updateByteByMode(opCode, 1, PDP11.fnINCB);
this.nStepCycles -= 1;
this.nStepCycles -= (this.dstMode? (8 + 1) : (2 + 1) + (this.dstReg == 7? 2 : 0));
};
/**
@ -1138,6 +1156,18 @@ PDP11.opIOT = function(opCode)
this.nStepCycles -= 1;
};
/**
* opJMP(opCode)
*
* @this {CPUStatePDP11}
* @param {number} opCode
*/
PDP11.opJMP = function(opCode)
{
this.setPC(this.getVirtualByMode(opCode, PDP11.ACCESS.VIRT));
this.nStepCycles -= 1;
};
/**
* opJSR(opCode)
*
@ -1149,8 +1179,8 @@ PDP11.opJSR = function(opCode)
var addr = this.getVirtualByMode(opCode, PDP11.ACCESS.VIRT);
var reg = (opCode >> PDP11.SRCMODE.SHIFT) & PDP11.OPREG.MASK;
this.pushWord(this.regsGen[reg]);
this.regsGen[reg] = this.regsGen[PDP11.REG.PC];
this.regsGen[PDP11.REG.PC] = addr;
this.regsGen[reg] = this.getPC();
this.setPC(addr);
this.nStepCycles -= 1;
};
@ -1162,7 +1192,7 @@ PDP11.opJSR = function(opCode)
*/
PDP11.opMARK = function(opCode)
{
var addr = (this.regsGen[PDP11.REG.PC] + ((opCode & 0x3F) << 1)) & 0xffff;
var addr = (this.getPC() + ((opCode & 0x3F) << 1)) & 0xffff;
var src = this.readWordFromVirtual(addr | 0x10000);
this.setPC(this.regsGen[5]);
this.setSP(addr + 2);
@ -1180,7 +1210,7 @@ PDP11.opMFPD = function(opCode)
{
var data = this.readWordFromPrevSpace(opCode, PDP11.ACCESS.DSPACE);
this.pushWord(data);
this.updateNZFlags(data);
this.updateNZVFlags(data);
this.nStepCycles -= 1;
};
@ -1194,10 +1224,15 @@ PDP11.opMFPI = function(opCode)
{
var data = this.readWordFromPrevSpace(opCode, PDP11.ACCESS.ISPACE);
this.pushWord(data);
this.updateNZFlags(data);
this.updateNZVFlags(data);
this.nStepCycles -= 1;
};
PDP11.MOV_CYCLES = [
[2 + 1, 8 + 1, 8 + 1, 11 + 2, 9 + 1, 12 + 2, 10 + 2, 13 + 3,
3 + 1, 8 + 1, 8 + 1, 11 + 2, 9 + 1, 12 + 2, 11 + 2, 14 + 3]
];
/**
* opMOV(opCode)
*
@ -1206,8 +1241,8 @@ PDP11.opMFPI = function(opCode)
*/
PDP11.opMOV = function(opCode)
{
this.updateNZFlags(this.writeWordByMode(opCode, this.readWordByMode(opCode >> PDP11.SRCMODE.SHIFT)));
this.nStepCycles -= 1;
this.updateNZVFlags(this.writeWordByMode(opCode, this.readWordByMode(opCode >> PDP11.SRCMODE.SHIFT)));
this.nStepCycles -= PDP11.MOV_CYCLES[(this.srcMode? 8 : 0) + this.dstMode] + (this.dstReg == 7 && !this.dstMode? 2 : 0);
};
/**
@ -1219,8 +1254,8 @@ PDP11.opMOV = function(opCode)
PDP11.opMOVB = function(opCode)
{
var data = this.readByteByMode(opCode >> PDP11.SRCMODE.SHIFT);
this.updateNZFlags(this.writeByteByMode(opCode, data, PDP11.WRITE.SIGNEXT) << 8);
this.nStepCycles -= 1;
this.updateNZVFlags(this.writeByteByMode(opCode, data, PDP11.WRITE.SIGNEXT) << 8);
this.nStepCycles -= (this.dstMode? (8 + 1) + (this.srcReg && this.dstReg >= 6? 1 : 0) : (this.srcMode? (3 + 2) : (2 + 1)) + (this.dstReg == 7? 2 : 0));
};
/**
@ -1233,7 +1268,7 @@ PDP11.opMTPD = function(opCode)
{
var data = this.popWord();
this.writeWordToPrevSpace(opCode, PDP11.ACCESS.DSPACE, data);
this.updateNZFlags(data);
this.updateNZVFlags(data);
this.nStepCycles -= 1;
};
@ -1247,7 +1282,7 @@ PDP11.opMTPI = function(opCode)
{
var data = this.popWord();
this.writeWordToPrevSpace(opCode, PDP11.ACCESS.ISPACE, data);
this.updateNZFlags(data);
this.updateNZVFlags(data);
this.nStepCycles -= 1;
};
@ -1331,7 +1366,7 @@ PDP11.opRESET = function(opCode)
PDP11.opROL = function(opCode)
{
this.updateWordByMode(opCode, 0, PDP11.fnROL);
this.nStepCycles -= 1;
this.nStepCycles -= (this.dstMode? (8 + 1) : (2 + 1) + (this.dstReg == 7? 2 : 0));
};
/**
@ -1343,7 +1378,7 @@ PDP11.opROL = function(opCode)
PDP11.opROLB = function(opCode)
{
this.updateByteByMode(opCode, 0, PDP11.fnROLB);
this.nStepCycles -= 1;
this.nStepCycles -= (this.dstMode? (8 + 1) : (2 + 1) + (this.dstReg == 7? 2 : 0));
};
/**
@ -1397,7 +1432,7 @@ PDP11.opRTS = function(opCode)
this.assert(!(opCode & 0x08));
var src = this.popWord();
var reg = opCode & PDP11.OPREG.MASK;
this.regsGen[PDP11.REG.PC] = this.regsGen[reg];
this.setPC(this.regsGen[reg]);
this.regsGen[reg] = src;
this.nStepCycles -= 1;
};
@ -1423,7 +1458,7 @@ PDP11.opRTT = function(opCode)
PDP11.opSBC = function(opCode)
{
this.updateWordByMode(opCode, this.getCF()? 1 : 0, PDP11.fnSUB);
this.nStepCycles -= 1;
this.nStepCycles -= (this.dstMode? (8 + 1) : (2 + 1) + (this.dstReg == 7? 2 : 0));
};
/**
@ -1435,7 +1470,7 @@ PDP11.opSBC = function(opCode)
PDP11.opSBCB = function(opCode)
{
this.updateByteByMode(opCode, this.getCF()? 1 : 0, PDP11.fnSUBB);
this.nStepCycles -= 1;
this.nStepCycles -= (this.dstMode? (8 + 1) : (2 + 1) + (this.dstReg == 7? 2 : 0));
};
/**
@ -1511,7 +1546,7 @@ PDP11.opSOB = function(opCode)
{
var reg = (opCode & PDP11.SRCMODE.REG) >> PDP11.SRCMODE.SHIFT;
if ((this.regsGen[reg] = ((this.regsGen[reg] - 1) & 0xffff))) {
this.setPC(this.regsGen[PDP11.REG.PC] - ((opCode & 0x3F) << 1));
this.setPC(this.getPC() - ((opCode & 0x3F) << 1));
}
this.nStepCycles -= 1;
};
@ -1541,7 +1576,19 @@ PDP11.opSPL = function(opCode)
PDP11.opSUB = function(opCode)
{
this.updateWordByMode(opCode, this.readWordByMode(opCode >> PDP11.SRCMODE.SHIFT), PDP11.fnSUB);
this.nStepCycles -= 1;
this.nStepCycles -= (this.dstMode? (8 + 1) + (this.srcReg && this.dstReg >= 6? 1 : 0) : (this.srcMode? (3 + 2) : (2 + 1)) + (this.dstReg == 7? 2 : 0));
};
/**
* opSWAB(opCode)
*
* @this {CPUStatePDP11}
* @param {number} opCode
*/
PDP11.opSWAB = function(opCode)
{
this.updateWordByMode(opCode, 0, PDP11.fnSWAB);
this.nStepCycles -= (this.dstMode? (8 + 1) : (2 + 1) + (this.dstReg == 7? 2 : 0));
};
/**
@ -1552,8 +1599,8 @@ PDP11.opSUB = function(opCode)
*/
PDP11.opSXT = function(opCode)
{
this.updateNZFlags(this.writeWordByMode(opCode, this.getNF? 0xffff : 0));
this.nStepCycles -= 1;
this.updateNZVFlags(this.writeWordByMode(opCode, this.getNF? 0xffff : 0));
this.nStepCycles -= (this.dstMode? (8 + 1) : (2 + 1) + (this.dstReg == 7? 2 : 0));
};
/**
@ -1645,7 +1692,7 @@ PDP11.opWAIT = function(opCode)
PDP11.opXOR = function(opCode)
{
this.updateWordByMode(opCode, this.readWordByMode((opCode & PDP11.SRCMODE.REG) >> PDP11.SRCMODE.SHIFT), PDP11.fnXOR);
this.nStepCycles -= 1;
this.nStepCycles -= (this.dstMode? (8 + 1) : (2 + 1) + (this.dstReg == 7? 2 : 0));
};
/**
@ -1913,22 +1960,22 @@ PDP11.aOps0DXn_1170 = [
];
PDP11.aOps00Xn_1170 = [
PDP11.op000X_1170, // 0x000n
PDP11.opUndefined, // 0x001n
PDP11.opUndefined, // 0x002n
PDP11.opUndefined, // 0x003n
PDP11.opUndefined, // 0x004n
PDP11.opUndefined, // 0x005n
PDP11.opUndefined, // 0x006n
PDP11.opUndefined, // 0x007n
PDP11.opRTS, // 0x008n 00020R (technically, bit 3 should also be CLR for the RTS opCode)
PDP11.opSPL, // 0x009n 00023N (technically, bit 3 should also be SET for the SPL opCode)
PDP11.op000X_1170, // 0x000n 000000-000017
PDP11.opUndefined, // 0x001n 000020-000037
PDP11.opUndefined, // 0x002n 000040-000057
PDP11.opUndefined, // 0x003n 000060-000077
PDP11.opJMP, // 0x004n 000100-000117
PDP11.opJMP, // 0x005n 000120-000137
PDP11.opJMP, // 0x006n 000140-000157
PDP11.opJMP, // 0x007n 000160-000177
PDP11.opRTS, // 0x008n 00020R (technically, bit 3 should also be CLR for the RTS opCode)
PDP11.opSPL, // 0x009n 00023N (technically, bit 3 should also be SET for the SPL opCode)
PDP11.op00AX_1170, // 0x00An 000240-000257
PDP11.op00BX_1170, // 0x00Bn 000260-000277
PDP11.opUndefined, // 0x00Cn
PDP11.opUndefined, // 0x00Dn
PDP11.opUndefined, // 0x00En
PDP11.opUndefined // 0x00Fn
PDP11.opSWAB, // 0x00Cn 000300-000317
PDP11.opSWAB, // 0x00Dn 000320-000337
PDP11.opSWAB, // 0x00En 000340-000357
PDP11.opSWAB // 0x00Fn 000360-000377
];
PDP11.aOps00AX_1170 = [

34
modules/pdp11/lib/cpustate.js
View file

@ -511,7 +511,7 @@ CPUStatePDP11.prototype.setNF = function()
*/
CPUStatePDP11.prototype.getPC = function()
{
return this.regsGen[7];
return this.regsGen[PDP11.REG.PC];
};
/**
@ -522,7 +522,7 @@ CPUStatePDP11.prototype.getPC = function()
*/
CPUStatePDP11.prototype.getPCWord = function()
{
var data = this.readWordFromVirtual(this.regsGen[7]);
var data = this.readWordFromVirtual(this.regsGen[PDP11.REG.PC]);
this.advancePC(2);
return data;
};
@ -535,7 +535,7 @@ CPUStatePDP11.prototype.getPCWord = function()
*/
CPUStatePDP11.prototype.advancePC = function(off)
{
this.regsGen[7] = (this.regsGen[7] + off) & 0xffff;
this.regsGen[PDP11.REG.PC] = (this.regsGen[PDP11.REG.PC] + off) & 0xffff;
};
/**
@ -546,7 +546,7 @@ CPUStatePDP11.prototype.advancePC = function(off)
*/
CPUStatePDP11.prototype.setPC = function(addr)
{
this.regsGen[7] = addr & 0xffff;
this.regsGen[PDP11.REG.PC] = addr & 0xffff;
};
/**
@ -557,7 +557,7 @@ CPUStatePDP11.prototype.setPC = function(addr)
*/
CPUStatePDP11.prototype.getSP = function()
{
return this.regsGen[6];
return this.regsGen[PDP11.REG.SP];
};
/**
@ -568,7 +568,7 @@ CPUStatePDP11.prototype.getSP = function()
*/
CPUStatePDP11.prototype.setSP = function(addr)
{
this.regsGen[6] = addr & 0xffff;
this.regsGen[PDP11.REG.SP] = addr & 0xffff;
};
/**
@ -746,14 +746,14 @@ CPUStatePDP11.prototype.setPSW = function(newPSW)
};
/**
* updateNZFlags(result)
* updateNZVFlags(result)
*
* NOTE: The V flag is simply zeroed, and the C flag is unchanged.
* NOTE: Only N and Z are updated based on the result; V is zeroed, C is unchanged.
*
* @this {CPUStatePDP11}
* @param {number} result
*/
CPUStatePDP11.prototype.updateNZFlags = function(result)
CPUStatePDP11.prototype.updateNZVFlags = function(result)
{
if (!(this.opFlags & PDP11.OPFLAG.NO_FLAGS)) {
this.flagN = this.flagZ = result;
@ -761,6 +761,22 @@ CPUStatePDP11.prototype.updateNZFlags = function(result)
}
};
/**
* updateNZVCFlags(result)
*
* NOTE: Only N and Z are updated based on the result; both V and C are simply zeroed.
*
* @this {CPUStatePDP11}
* @param {number} result
*/
CPUStatePDP11.prototype.updateNZVCFlags = function(result)
{
if (!(this.opFlags & PDP11.OPFLAG.NO_FLAGS)) {
this.flagN = this.flagZ = result;
this.flagV = this.flagC = 0;
}
};
/**
* updateAllFlags(result, overflow)
*