Retro/pcjs
Watch
1
0
Fork
You've already forked pcjs
 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Cleaned up the decoding SRCMODE and DSTMODE operands, should be less confusing now

Browse source
This commit is contained in:
Jeff 2016-10-04 17:22:25 -07:00 • committed by Jeff Parsons
commit 795d57839b
6 changed files with 569 additions and 567 deletions
Download patch file Download diff file Expand all files Collapse all files

190
modules/pdp11/lib/cpuops.js
View file

@ -461,7 +461,7 @@ PDP11.fnXOR = function(src, dst)
*/
PDP11.opADC = function(opCode)
{
this.updateWordByMode(opCode, this.getCF()? 1 : 0, PDP11.fnADD);
this.updateDstWord(opCode, this.getCF()? 1 : 0, PDP11.fnADD);
this.nStepCycles -= (this.dstMode? (8 + 1) : (2 + 1) + (this.dstReg == 7? 2 : 0));
};
@ -473,7 +473,7 @@ PDP11.opADC = function(opCode)
*/
PDP11.opADCB = function(opCode)
{
this.updateByteByMode(opCode, this.getCF()? 1 : 0, PDP11.fnADDB);
this.updateDstByte(opCode, this.getCF()? 1 : 0, PDP11.fnADDB);
this.nStepCycles -= (this.dstMode? (8 + 1) : (2 + 1) + (this.dstReg == 7? 2 : 0));
};
@ -485,7 +485,7 @@ PDP11.opADCB = function(opCode)
*/
PDP11.opADD = function(opCode)
{
this.updateWordByMode(opCode, this.readWordByMode(opCode >> PDP11.SRCMODE.SHIFT), PDP11.fnADD);
this.updateDstWord(opCode, this.readSrcWord(opCode), 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));
};
@ -497,11 +497,7 @@ PDP11.opADD = function(opCode)
*/
PDP11.opASH = function(opCode)
{
/*
* NOTE: Because readWordByMode() is being used to READ (not WRITE) the DSTMODE field of opCode,
* this.srcMode and this.srcReg must be used instead of this.dstMode and this.dstReg.
*/
var src = this.readWordByMode(opCode);
var src = this.readDstWord(opCode);
var reg = (opCode >> 6) & 7;
var result = this.regsGen[reg];
if (result & 0x8000) result |= 0xffff0000;
@ -525,7 +521,7 @@ PDP11.opASH = function(opCode)
}
this.regsGen[reg] = result & 0xffff;
this.flagN = this.flagZ = result;
this.nStepCycles -= (this.srcMode? (5 + 1) : (6 + 1)) + src;
this.nStepCycles -= (this.dstMode? (5 + 1) : (6 + 1)) + src;
};
/**
@ -536,11 +532,7 @@ PDP11.opASH = function(opCode)
*/
PDP11.opASHC = function(opCode)
{
/*
* NOTE: Because readWordByMode() is being used to READ (not WRITE) the DSTMODE field of opCode,
* this.srcMode and this.srcReg must be used instead of this.dstMode and this.dstReg.
*/
var src = this.readWordByMode(opCode);
var src = this.readDstWord(opCode);
var reg = (opCode >> 6) & 7;
var dst = (this.regsGen[reg] << 16) | this.regsGen[reg | 1];
this.flagC = this.flagV = 0;
@ -571,7 +563,7 @@ PDP11.opASHC = function(opCode)
this.regsGen[reg | 1] = result & 0xffff;
this.flagN = result >> 16;
this.flagZ = result >> 16 | result;
this.nStepCycles -= (this.srcMode? (5 + 1) : (6 + 1)) + src;
this.nStepCycles -= (this.dstMode? (5 + 1) : (6 + 1)) + src;
};
/**
@ -582,7 +574,7 @@ PDP11.opASHC = function(opCode)
*/
PDP11.opASL = function(opCode)
{
this.updateWordByMode(opCode, 0, PDP11.fnASL);
this.updateDstWord(opCode, 0, PDP11.fnASL);
this.nStepCycles -= (this.dstMode? (8 + 1) : (2 + 1) + (this.dstReg == 7? 2 : 0));
};
@ -594,7 +586,7 @@ PDP11.opASL = function(opCode)
*/
PDP11.opASLB = function(opCode)
{
this.updateByteByMode(opCode, 0, PDP11.fnASLB);
this.updateDstByte(opCode, 0, PDP11.fnASLB);
this.nStepCycles -= (this.dstMode? (8 + 1) : (2 + 1) + (this.dstReg == 7? 2 : 0));
};
@ -606,7 +598,7 @@ PDP11.opASLB = function(opCode)
*/
PDP11.opASR = function(opCode)
{
this.updateWordByMode(opCode, 0, PDP11.fnASR);
this.updateDstWord(opCode, 0, PDP11.fnASR);
this.nStepCycles -= (this.dstMode? (8 + 1) : (2 + 1) + (this.dstReg == 7? 2 : 0));
};
@ -618,7 +610,7 @@ PDP11.opASR = function(opCode)
*/
PDP11.opASRB = function(opCode)
{
this.updateByteByMode(opCode, 0, PDP11.fnASRB);
this.updateDstByte(opCode, 0, PDP11.fnASRB);
this.nStepCycles -= (this.dstMode? (8 + 1) + (this.dstAddr & 1) : (2 + 1) + (this.dstReg == 7? 2 : 0));
};
@ -652,7 +644,7 @@ PDP11.opBCS = function(opCode)
*/
PDP11.opBIC = function(opCode)
{
this.updateWordByMode(opCode, this.readWordByMode(opCode >> PDP11.SRCMODE.SHIFT), PDP11.fnBIC);
this.updateDstWord(opCode, this.readSrcWord(opCode), PDP11.fnBIC);
this.nStepCycles -= (this.dstMode? (8 + 1) + (this.srcReg && this.dstReg >= 6? 1 : 0) : (this.srcMode? (3 + 2) : (2 + 1)) + (this.dstReg == 7? 2 : 0));
};
@ -664,7 +656,7 @@ PDP11.opBIC = function(opCode)
*/
PDP11.opBICB = function(opCode)
{
this.updateByteByMode(opCode, this.readByteByMode(opCode >> PDP11.SRCMODE.SHIFT), PDP11.fnBICB);
this.updateDstByte(opCode, this.readSrcByte(opCode), PDP11.fnBICB);
this.nStepCycles -= (this.dstMode? (8 + 1) + (this.srcReg && this.dstReg >= 6? 1 : 0) : (this.srcMode? (3 + 2) : (2 + 1)) + (this.dstReg == 7? 2 : 0));
};
@ -676,7 +668,7 @@ PDP11.opBICB = function(opCode)
*/
PDP11.opBIS = function(opCode)
{
this.updateWordByMode(opCode, this.readWordByMode(opCode >> PDP11.SRCMODE.SHIFT), PDP11.fnBIS);
this.updateDstWord(opCode, this.readSrcWord(opCode), PDP11.fnBIS);
this.nStepCycles -= (this.dstMode? (8 + 1) + (this.srcReg && this.dstReg >= 6? 1 : 0) : (this.srcMode? (3 + 2) : (2 + 1)) + (this.dstReg == 7? 2 : 0));
};
@ -688,7 +680,7 @@ PDP11.opBIS = function(opCode)
*/
PDP11.opBISB = function(opCode)
{
this.updateByteByMode(opCode, this.readByteByMode(opCode >> PDP11.SRCMODE.SHIFT), PDP11.fnBISB);
this.updateDstByte(opCode, this.readSrcByte(opCode), PDP11.fnBISB);
this.nStepCycles -= (this.dstMode? (8 + 1) + (this.srcReg && this.dstReg >= 6? 1 : 0) : (this.srcMode? (3 + 2) : (2 + 1)) + (this.dstReg == 7? 2 : 0));
};
@ -700,20 +692,8 @@ PDP11.opBISB = function(opCode)
*/
PDP11.opBIT = function(opCode)
{
/*
* NOTE: Because readWordByMode() will be used to READ (not WRITE) the DSTMODE field of opCode,
* the srcMode and srcReg properties need to be copied before they get overwritten.
*/
var src = this.readWordByMode(opCode >> PDP11.SRCMODE.SHIFT);
var srcMode = this.srcMode;
var srcReg = this.srcReg;
/*
* NOTE: Because readWordByMode() is being used to READ (not WRITE) the DSTMODE field of opCode,
* this.srcMode and this.srcReg must be used instead of this.dstMode and this.dstReg.
*/
var dst = this.readWordByMode(opCode);
this.updateNZVFlags(src & dst);
this.nStepCycles -= (this.srcMode? (3 + 1) + (srcReg && this.srcReg >= 6? 1 : 0) : (srcMode? (3 + 1) : (2 + 1)) + (this.srcReg == 7? 2 : 0));
this.updateNZVFlags(this.readSrcWord(opCode) & this.readDstWord(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));
};
/**
@ -724,20 +704,8 @@ PDP11.opBIT = function(opCode)
*/
PDP11.opBITB = function(opCode)
{
/*
* NOTE: Because readByteByMode() will be used to READ (not WRITE) the DSTMODE field of opCode,
* the srcMode and srcReg properties need to be copied before they get overwritten.
*/
var src = this.readByteByMode(opCode >> PDP11.SRCMODE.SHIFT);
var srcMode = this.srcMode;
var srcReg = this.srcReg;
/*
* NOTE: Because readByteByMode() is being used to READ (not WRITE) the DSTMODE field of opCode,
* this.srcMode and this.srcReg must be used instead of this.dstMode and this.dstReg.
*/
var dst = this.readByteByMode(opCode);
this.updateNZVFlags((src & dst) << 8);
this.nStepCycles -= (this.srcMode? (3 + 1) + (srcReg && this.srcReg >= 6? 1 : 0) : (srcMode? (3 + 1) : (2 + 1)) + (this.srcReg == 7? 2 : 0));
this.updateNZVFlags((this.readSrcByte(opCode) & this.readDstByte(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));
};
/**
@ -903,7 +871,7 @@ PDP11.opBVS = function(opCode)
*/
PDP11.opCLR = function(opCode)
{
this.updateAllFlags(this.writeWordByMode(opCode, 0));
this.updateAllFlags(this.writeDstWord(opCode, 0));
this.nStepCycles -= (this.dstMode? (8 + 1) : (2 + 1) + (this.dstReg == 7? 2 : 0));
};
@ -915,7 +883,7 @@ PDP11.opCLR = function(opCode)
*/
PDP11.opCLRB = function(opCode)
{
this.updateAllFlags(this.writeByteByMode(opCode, 0));
this.updateAllFlags(this.writeDstByte(opCode, 0));
this.nStepCycles -= (this.dstMode? (8 + 1) : (2 + 1) + (this.dstReg == 7? 2 : 0));
};
@ -993,25 +961,14 @@ PDP11.opCLx = function(opCode)
*/
PDP11.opCMP = function(opCode)
{
/*
* NOTE: Because readWordByMode() will be used to READ (not WRITE) the DSTMODE field of opCode,
* the srcMode and srcReg properties need to be copied before they get overwritten.
*/
var src = this.readWordByMode(opCode >> PDP11.SRCMODE.SHIFT);
var srcMode = this.srcMode;
var srcReg = this.srcReg;
/*
* NOTE: Because readWordByMode() is being used to READ (not WRITE) the DSTMODE field of opCode,
* this.srcMode and this.srcReg must be used instead of this.dstMode and this.dstReg.
*/
var dst = this.readWordByMode(opCode);
var src = this.readSrcWord(opCode);
var dst = this.readDstWord(opCode);
var result = src - dst;
/*
* NOTE: CMP calculates (src - dst) rather than (dst - src), so when we call updateSubFlags(),
* we must reverse the order of the src and dst parameters.
* NOTE: CMP calculates (src - dst) rather than (dst - src), so src and dst updateSubFlags() parms must be reversed.
*/
this.updateSubFlags(result, dst, src);
this.nStepCycles -= (this.srcMode? (3 + 1) + (srcReg && this.srcReg >= 6? 1 : 0) : (srcMode? (3 + 1) : (2 + 1)) + (this.srcReg == 7? 2 : 0));
this.nStepCycles -= (this.dstMode? (3 + 1) + (this.srcReg && this.dstReg >= 6? 1 : 0) : (this.srcMode? (3 + 1) : (2 + 1)) + (this.dstReg == 7? 2 : 0));
};
/**
@ -1022,25 +979,14 @@ PDP11.opCMP = function(opCode)
*/
PDP11.opCMPB = function(opCode)
{
/*
* NOTE: Because readByteByMode() will be used to READ (not WRITE) the DSTMODE field of opCode,
* the srcMode and srcReg properties need to be copied before they get overwritten.
*/
var src = this.readByteByMode(opCode >> PDP11.SRCMODE.SHIFT) << 8;
var srcMode = this.srcMode;
var srcReg = this.srcReg;
/*
* NOTE: Because readByteByMode() is being used to READ (not WRITE) the DSTMODE field of opCode,
* this.srcMode and this.srcReg must be used instead of this.dstMode and this.dstReg.
*/
var dst = this.readByteByMode(opCode) << 8;
var src = this.readSrcByte(opCode) << 8;
var dst = this.readDstByte(opCode) << 8;
var result = src - dst;
/*
* NOTE: CMP calculates (src - dst) rather than (dst - src), so when we call updateSubFlags(),
* we must reverse the order of the src and dst parameters.
* NOTE: CMP calculates (src - dst) rather than (dst - src), so src and dst updateSubFlags() parms must be reversed.
*/
this.updateSubFlags(result, dst, src);
this.nStepCycles -= (this.srcMode? (3 + 1) + (srcReg && this.srcReg >= 6? 1 : 0) : (srcMode? (3 + 1) : (2 + 1)) + (this.srcReg == 7? 2 : 0));
this.nStepCycles -= (this.dstMode? (3 + 1) + (this.srcReg && this.dstReg >= 6? 1 : 0) : (this.srcMode? (3 + 1) : (2 + 1)) + (this.dstReg == 7? 2 : 0));
};
/**
@ -1051,7 +997,7 @@ PDP11.opCMPB = function(opCode)
*/
PDP11.opCOM = function(opCode)
{
this.updateWordByMode(opCode, 0, PDP11.fnCOM);
this.updateDstWord(opCode, 0, PDP11.fnCOM);
this.nStepCycles -= (this.dstMode? (8 + 1) : (2 + 1) + (this.dstReg == 7? 2 : 0));
};
@ -1063,7 +1009,7 @@ PDP11.opCOM = function(opCode)
*/
PDP11.opCOMB = function(opCode)
{
this.updateByteByMode(opCode, 0, PDP11.fnCOMB);
this.updateDstByte(opCode, 0, PDP11.fnCOMB);
this.nStepCycles -= (this.dstMode? (8 + 1) : (2 + 1) + (this.dstReg == 7? 2 : 0));
};
@ -1075,7 +1021,7 @@ PDP11.opCOMB = function(opCode)
*/
PDP11.opDEC = function(opCode)
{
this.updateWordByMode(opCode, 1, PDP11.fnDEC);
this.updateDstWord(opCode, 1, PDP11.fnDEC);
this.nStepCycles -= (this.dstMode? (8 + 1) : (2 + 1) + (this.dstReg == 7? 2 : 0));
};
@ -1087,7 +1033,7 @@ PDP11.opDEC = function(opCode)
*/
PDP11.opDECB = function(opCode)
{
this.updateByteByMode(opCode, 1, PDP11.fnDECB);
this.updateDstByte(opCode, 1, PDP11.fnDECB);
this.nStepCycles -= (this.dstMode? (8 + 1) : (2 + 1) + (this.dstReg == 7? 2 : 0));
};
@ -1102,7 +1048,7 @@ PDP11.opDIV = function(opCode)
/*
* TODO: Review and determine if flag updates can be encapsulated in an updateDivFlags() function.
*/
var src = this.readWordByMode(opCode);
var src = this.readDstWord(opCode);
if (!src) {
this.flagN = 0; // NZVC
this.flagZ = 0;
@ -1169,7 +1115,7 @@ PDP11.opHALT = function(opCode)
*/
PDP11.opINC = function(opCode)
{
this.updateWordByMode(opCode, 1, PDP11.fnINC);
this.updateDstWord(opCode, 1, PDP11.fnINC);
this.nStepCycles -= (this.dstMode? (8 + 1) : (2 + 1) + (this.dstReg == 7? 2 : 0));
};
@ -1181,7 +1127,7 @@ PDP11.opINC = function(opCode)
*/
PDP11.opINCB = function(opCode)
{
this.updateByteByMode(opCode, 1, PDP11.fnINCB);
this.updateDstByte(opCode, 1, PDP11.fnINCB);
this.nStepCycles -= (this.dstMode? (8 + 1) : (2 + 1) + (this.dstReg == 7? 2 : 0));
};
@ -1211,12 +1157,11 @@ PDP11.opJMP = function(opCode)
{
/*
* Since JMP and JSR opcodes have their own unique timings for the various dst modes, we must snapshot
* nStepCycles before decoding the mode, and then use that to update nStepCycles. Moreover, we must use
* srcMode rather than dstMode, because JMP does not WRITE the dst operand; it merely READs it.
* nStepCycles before decoding the mode, and then use that to update nStepCycles.
*/
var nSnapCycles = this.nStepCycles;
this.setPC(this.getVirtualByMode(opCode, PDP11.ACCESS.VIRT));
this.nStepCycles = nSnapCycles - PDP11.JMP_CYCLES[this.srcMode];
this.setPC(this.readDstAddr(opCode));
this.nStepCycles = nSnapCycles - PDP11.JMP_CYCLES[this.dstMode];
};
PDP11.JSR_CYCLES = [
@ -1233,20 +1178,19 @@ PDP11.opJSR = function(opCode)
{
/*
* Since JMP and JSR opcodes have their own unique timings for the various dst modes, we must snapshot
* nStepCycles before decoding the mode, and then use that to update nStepCycles. Moreover, we must use
* srcMode rather than dstMode, because JSR does not WRITE the dst operand; it merely READs it.
* nStepCycles before decoding the mode, and then use that to update nStepCycles.
*/
var nSnapCycles = this.nStepCycles;
/*
* TODO: Determine whether or not the SRCMODE operand (regsGen[reg]) should be snapped BEFORE or AFTER we
* decode the DSTMODE operand. Doing it AFTER seems a bit risky.
*/
var addr = this.getVirtualByMode(opCode, PDP11.ACCESS.VIRT);
var addr = this.readDstAddr(opCode);
var reg = (opCode >> PDP11.SRCMODE.SHIFT) & PDP11.OPREG.MASK;
this.pushWord(this.regsGen[reg]);
this.regsGen[reg] = this.getPC();
this.setPC(addr);
this.nStepCycles = nSnapCycles - PDP11.JSR_CYCLES[this.srcMode];
this.nStepCycles = nSnapCycles - PDP11.JSR_CYCLES[this.dstMode];
};
/**
@ -1310,9 +1254,9 @@ PDP11.opMOV = function(opCode)
* Since MOV opcodes have their own unique timings for the various dst modes, we must snapshot
* nStepCycles after decoding the src mode, and then use that to update nStepCycles.
*/
var data = this.readWordByMode(opCode >> PDP11.SRCMODE.SHIFT);
var data = this.readSrcWord(opCode);
var nSnapCycles = this.nStepCycles;
this.updateNZVFlags(this.writeWordByMode(opCode, data));
this.updateNZVFlags(this.writeDstWord(opCode, data));
this.nStepCycles = nSnapCycles - PDP11.MOV_CYCLES[(this.srcMode? 8 : 0) + this.dstMode] + (this.dstReg == 7 && !this.dstMode? 2 : 0);
};
@ -1324,8 +1268,8 @@ PDP11.opMOV = function(opCode)
*/
PDP11.opMOVB = function(opCode)
{
var data = this.readByteByMode(opCode >> PDP11.SRCMODE.SHIFT);
this.updateNZVFlags(this.writeByteByMode(opCode, data, PDP11.WRITE.SIGNEXT) << 8);
var data = this.readSrcByte(opCode);
this.updateNZVFlags(this.writeDstByte(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));
};
@ -1379,7 +1323,7 @@ PDP11.opMTPI = function(opCode)
*/
PDP11.opMUL = function(opCode)
{
var src = this.readWordByMode(opCode);
var src = this.readDstWord(opCode);
var reg = (opCode >> 6) & 7;
if (src & 0x8000) src |= ~0xffff;
var dst = this.regsGen[reg];
@ -1399,7 +1343,7 @@ PDP11.opMUL = function(opCode)
*/
PDP11.opNEG = function(opCode)
{
this.updateWordByMode(opCode, 0, PDP11.fnNEG);
this.updateDstWord(opCode, 0, PDP11.fnNEG);
this.nStepCycles -= (this.dstMode? (10 + 1) : (5 + 1));
};
@ -1411,7 +1355,7 @@ PDP11.opNEG = function(opCode)
*/
PDP11.opNEGB = function(opCode)
{
this.updateByteByMode(opCode, 0, PDP11.fnNEGB);
this.updateDstByte(opCode, 0, PDP11.fnNEGB);
this.nStepCycles -= (this.dstMode? (10 + 1) : (5 + 1));
};
@ -1450,7 +1394,7 @@ PDP11.opRESET = function(opCode)
*/
PDP11.opROL = function(opCode)
{
this.updateWordByMode(opCode, 0, PDP11.fnROL);
this.updateDstWord(opCode, 0, PDP11.fnROL);
this.nStepCycles -= (this.dstMode? (8 + 1) : (2 + 1) + (this.dstReg == 7? 2 : 0));
};
@ -1462,7 +1406,7 @@ PDP11.opROL = function(opCode)
*/
PDP11.opROLB = function(opCode)
{
this.updateByteByMode(opCode, 0, PDP11.fnROLB);
this.updateDstByte(opCode, 0, PDP11.fnROLB);
this.nStepCycles -= (this.dstMode? (8 + 1) : (2 + 1) + (this.dstReg == 7? 2 : 0));
};
@ -1474,7 +1418,7 @@ PDP11.opROLB = function(opCode)
*/
PDP11.opROR = function(opCode)
{
this.updateWordByMode(opCode, 0, PDP11.fnROR);
this.updateDstWord(opCode, 0, PDP11.fnROR);
this.nStepCycles -= (this.dstMode? (8 + 1) : (2 + 1) + (this.dstReg == 7? 2 : 0));
};
@ -1486,7 +1430,7 @@ PDP11.opROR = function(opCode)
*/
PDP11.opRORB = function(opCode)
{
this.updateByteByMode(opCode, 0, PDP11.fnRORB);
this.updateDstByte(opCode, 0, PDP11.fnRORB);
this.nStepCycles -= (this.dstMode? (8 + 1) + (this.dstAddr & 1) : (2 + 1) + (this.dstReg == 7? 2 : 0));
};
@ -1545,7 +1489,7 @@ PDP11.opRTT = function(opCode)
*/
PDP11.opSBC = function(opCode)
{
this.updateWordByMode(opCode, this.getCF()? 1 : 0, PDP11.fnSUB);
this.updateDstWord(opCode, this.getCF()? 1 : 0, PDP11.fnSUB);
this.nStepCycles -= (this.dstMode? (8 + 1) : (2 + 1) + (this.dstReg == 7? 2 : 0));
};
@ -1557,7 +1501,7 @@ PDP11.opSBC = function(opCode)
*/
PDP11.opSBCB = function(opCode)
{
this.updateByteByMode(opCode, this.getCF()? 1 : 0, PDP11.fnSUBB);
this.updateDstByte(opCode, this.getCF()? 1 : 0, PDP11.fnSUBB);
this.nStepCycles -= (this.dstMode? (8 + 1) : (2 + 1) + (this.dstReg == 7? 2 : 0));
};
@ -1670,7 +1614,7 @@ PDP11.opSPL = function(opCode)
*/
PDP11.opSUB = function(opCode)
{
this.updateWordByMode(opCode, this.readWordByMode(opCode >> PDP11.SRCMODE.SHIFT), PDP11.fnSUB);
this.updateDstWord(opCode, this.readSrcWord(opCode), PDP11.fnSUB);
this.nStepCycles -= (this.dstMode? (8 + 1) + (this.srcReg && this.dstReg >= 6? 1 : 0) : (this.srcMode? (3 + 2) : (2 + 1)) + (this.dstReg == 7? 2 : 0));
};
@ -1682,7 +1626,7 @@ PDP11.opSUB = function(opCode)
*/
PDP11.opSWAB = function(opCode)
{
this.updateWordByMode(opCode, 0, PDP11.fnSWAB);
this.updateDstWord(opCode, 0, PDP11.fnSWAB);
this.nStepCycles -= (this.dstMode? (8 + 1) : (2 + 1) + (this.dstReg == 7? 2 : 0));
};
@ -1694,7 +1638,7 @@ PDP11.opSWAB = function(opCode)
*/
PDP11.opSXT = function(opCode)
{
this.updateNZVFlags(this.writeWordByMode(opCode, this.getNF? 0xffff : 0));
this.updateNZVFlags(this.writeDstWord(opCode, this.getNF? 0xffff : 0));
this.nStepCycles -= (this.dstMode? (8 + 1) : (2 + 1) + (this.dstReg == 7? 2 : 0));
};
@ -1718,14 +1662,10 @@ PDP11.opTRAP = function(opCode)
*/
PDP11.opTST = function(opCode)
{
/*
* NOTE: Because readWordByMode() is being used to READ (not WRITE) the DSTMODE field of opCode,
* this.srcMode and this.srcReg must be used instead of this.dstMode and this.dstReg.
*/
var result = this.readWordByMode(opCode);
var result = this.readDstWord(opCode);
this.assert(!(result & ~0xffff)); // assert that C flag will be clear
this.updateAllFlags(result);
this.nStepCycles -= (this.srcMode? (3 + 1) : (2 + 1) + (this.srcReg == 7? 2 : 0));
this.nStepCycles -= (this.dstMode? (3 + 1) : (2 + 1) + (this.dstReg == 7? 2 : 0));
};
/**
@ -1736,14 +1676,10 @@ PDP11.opTST = function(opCode)
*/
PDP11.opTSTB = function(opCode)
{
/*
* NOTE: Because readByteByMode() is being used to READ (not WRITE) the DSTMODE field of opCode,
* this.srcMode and this.srcReg must be used instead of this.dstMode and this.dstReg.
*/
var result = this.readByteByMode(opCode);
var result = this.readDstByte(opCode);
this.assert(!(result & ~0xff)); // assert that C flag will be clear
this.updateAllFlags(result << 8);
this.nStepCycles -= (this.srcMode? (3 + 1) : (2 + 1) + (this.srcReg == 7? 2 : 0));
this.nStepCycles -= (this.dstMode? (3 + 1) : (2 + 1) + (this.dstReg == 7? 2 : 0));
};
/**
@ -1794,7 +1730,7 @@ PDP11.opWAIT = function(opCode)
*/
PDP11.opXOR = function(opCode)
{
this.updateWordByMode(opCode, this.readWordByMode((opCode & PDP11.SRCMODE.REG) >> PDP11.SRCMODE.SHIFT), PDP11.fnXOR);
this.updateDstWord(opCode, this.readSrcWord(opCode), PDP11.fnXOR);
this.nStepCycles -= (this.dstMode? (8 + 1) : (2 + 1) + (this.dstReg == 7? 2 : 0));
};