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Minor Debugger improvements, notes, etc, while debugging the PDP-11 BASIC

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This commit is contained in:
Jeff Parsons 2016-10-20 22:56:29 -07:00 • committed by Jeff Parsons
commit aa2a25c5ec
7 changed files with 163 additions and 94 deletions
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15
modules/pdp11/lib/cpuops.js
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@ -827,7 +827,7 @@ PDP11.opBPL = function(opCode)
*/
PDP11.opBPT = function(opCode)
{
this.trap(PDP11.TRAP.BREAKPOINT, PDP11.REASON.BPT);
this.trap(PDP11.TRAP.BPT, PDP11.REASON.BPT);
this.nStepCycles -= (4 + 1);
};
@ -1101,7 +1101,7 @@ PDP11.opDIV = function(opCode)
*/
PDP11.opEMT = function(opCode)
{
this.trap(PDP11.TRAP.EMULATOR, PDP11.REASON.EMT);
this.trap(PDP11.TRAP.EMT, PDP11.REASON.EMT);
this.nStepCycles -= (22 + 3);
};
@ -1496,8 +1496,15 @@ PDP11.opRTS = function(opCode)
}
var src = this.popWord();
var reg = opCode & PDP11.OPREG.MASK;
this.setPC(this.regsGen[reg]);
this.regsGen[reg] = src;
/*
* When the popular "RTS PC" form is used, we might as well eliminate the useless setting of PC to itself.
*/
if (reg == PDP11.REG.PC) {
this.setPC(src);
} else {
this.setPC(this.regsGen[reg]);
this.regsGen[reg] = src;
}
this.nStepCycles -= (7 + 2);
};