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Started work on new decoding functions

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This commit is contained in:
Jeff 2016-09-22 18:47:32 -07:00 • committed by Jeff Parsons
commit 7f0b6a091d
8 changed files with 852 additions and 732 deletions
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35
modules/pdp11/lib/device.js
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@ -222,17 +222,9 @@ DevicePDP11.prototype.readPSW = function(addr)
*/
DevicePDP11.prototype.writePSW = function(data, addr)
{
/*
* TODO: Determine whether we need to replicate the code in access_iopage() that returns a bogus
* error when writing to ADDR_PSW, as a way of preventing instructions like CLR from updating the flags
* and potentially modifying some of the PSW bits that were just set (eg, the Z flag).
*
* If so, then we'll need to centralize the flag update logic, so that it can be skipped whenever a
* special one-time opcode flag is set. Because there are a number of arithmetic instructions besides
* CLR that could be used to modify ADDR_PSW.
*/
var maskDisallowed = PDP11.PSW.UNUSED | PDP11.PSW.TF;
this.cpu.setPSW((data & ~maskDisallowed) | (this.cpu.getPSW() & maskDisallowed));
this.cpu.opFlags |= PDP11.OPFLAG.SKIP_FLAGS;
};
/**
@ -623,27 +615,6 @@ DevicePDP11.prototype.kw11_interrupt = function()
}
};
/**
* mapUnibus(unibusAddress)
*
* @this {DevicePDP11}
* @param {number} unibusAddress
* @return {number}
*/
DevicePDP11.prototype.mapUnibus = function(unibusAddress)
{
var idx = (unibusAddress >> 13) & 0x1f;
if (idx < 31) {
if (this.cpu.MMR3 & 0x20) {
unibusAddress = (this.cpu.unibusMap[idx] + (unibusAddress & 0x1ffe)) & 0x3ffffe;
if (unibusAddress >= BusPDP11.IOPAGE_UNIBUS && unibusAddress < BusPDP11.IOPAGE_22BIT) this.cpu.panic(898);
}
} else {
unibusAddress |= BusPDP11.IOPAGE_22BIT;
}
return unibusAddress;
};
/**
* getData(xhr, callback, meta, block, address, count)
*
@ -764,7 +735,7 @@ DevicePDP11.prototype.readData = function(meta, block, address, count)
return;
}
for (word = 0; word < meta.blocksize && count > 0; word++) {
if (this.cpu.writeWordByAddr((meta.mapped? this.mapUnibus(address) : address), meta.cache[block][word]) < 0) {
if (this.cpu.writeWordByAddr((meta.mapped? this.cpu.mapUnibus(address) : address), meta.cache[block][word]) < 0) {
meta.postProcess(2, meta, block, address, count); // NXM
return;
}
@ -798,7 +769,7 @@ DevicePDP11.prototype.writeData = function(meta, block, address, count)
}
}
for (word = 0; word < meta.blocksize && count > 0; word++) {
data = this.cpu.readWordByAddr((meta.mapped? this.mapUnibus(address) : address));
data = this.cpu.readWordByAddr((meta.mapped? this.cpu.mapUnibus(address) : address));
if (data < 0) {
meta.postProcess(2, meta, block, address, count); // NXM
return;