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New improved I/O handler functions for the PDP-11

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Jeff 2016-09-21 12:44:25 -07:00 • committed by Jeff Parsons
commit dfe367f53d
18 changed files with 847 additions and 1059 deletions
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46
modules/pdp11/lib/memory.js
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@ -383,7 +383,19 @@ MemoryPDP11.prototype = {
/**
* setAccess(afn, fDirect)
*
* If no function table is specified, a default is selected based on the MemoryPDP11 type.
* The afn parameter should be a 4-entry function table containing two byte handlers and
* two short handlers. See the static afnMemory table for an example.
*
* If no function table is specified, a default is selected based on the MemoryPDP11 type;
* similarly, any undefined entries in the table are filled with default handlers that fall
* back to the byte handlers, and if one or both byte handlers are undefined, they default
* to handlers that simply ignore the access.
*
* fDirect indicates that both the default AND the direct handlers should be updated. Direct
* handlers normally match the default handlers, except when "checked" handlers are installed;
* this allows "checked" handlers to know where to dispatch the call after performing checks.
* Examples of checks are read/write breakpoints, but it's really up to the Debugger to decide
* what the check consists of.
*
* @this {MemoryPDP11}
* @param {Array.<function()>} [afn] function table
@ -407,11 +419,11 @@ MemoryPDP11.prototype = {
setReadAccess: function(afn, fDirect) {
if (!fDirect || !this.cReadBreakpoints) {
this.readByte = afn[0] || this.readNone;
this.readShort = afn[1] || this.readShortDefault;
this.readShort = afn[2] || this.readShortDefault;
}
if (fDirect || fDirect === undefined) {
this.readByteDirect = afn[0] || this.readNone;
this.readShortDirect = afn[1] || this.readShortDefault;
this.readShortDirect = afn[2] || this.readShortDefault;
}
},
/**
@ -423,11 +435,11 @@ MemoryPDP11.prototype = {
*/
setWriteAccess: function(afn, fDirect) {
if (!fDirect || !this.cWriteBreakpoints) {
this.writeByte = !this.fReadOnly && afn[2] || this.writeNone;
this.writeByte = !this.fReadOnly && afn[1] || this.writeNone;
this.writeShort = !this.fReadOnly && afn[3] || this.writeShortDefault;
}
if (fDirect || fDirect === undefined) {
this.writeByteDirect = afn[2] || this.writeNone;
this.writeByteDirect = afn[1] || this.writeNone;
this.writeShortDirect = afn[3] || this.writeShortDefault;
}
},
@ -830,43 +842,43 @@ MemoryPDP11.prototype = {
/*
* This is the effective definition of afnNone, but we need not fully define it, because setAccess()
* uses these defaults when any of the 4 handlers (ie, 2 read handlers and 2 write handlers) are undefined.
* uses these defaults when any of the 4 handlers (ie, 2 byte handlers and 2 short handlers) are undefined.
*
MemoryPDP11.afnNone = [
MemoryPDP11.afnNone = [
MemoryPDP11.prototype.readNone,
MemoryPDP11.prototype.readShortDefault,
MemoryPDP11.prototype.writeNone,
MemoryPDP11.prototype.readShortDefault,
MemoryPDP11.prototype.writeShortDefault
];
*/
MemoryPDP11.afnNone = [];
MemoryPDP11.afnNone = [];
MemoryPDP11.afnMemory = [
MemoryPDP11.afnMemory = [
MemoryPDP11.prototype.readByteMemory,
MemoryPDP11.prototype.readShortMemory,
MemoryPDP11.prototype.writeByteMemory,
MemoryPDP11.prototype.readShortMemory,
MemoryPDP11.prototype.writeShortMemory
];
MemoryPDP11.afnChecked = [
MemoryPDP11.afnChecked = [
MemoryPDP11.prototype.readByteChecked,
MemoryPDP11.prototype.readShortChecked,
MemoryPDP11.prototype.writeByteChecked,
MemoryPDP11.prototype.readShortChecked,
MemoryPDP11.prototype.writeShortChecked
];
if (TYPEDARRAYS) {
MemoryPDP11.afnArrayBE = [
MemoryPDP11.afnArrayBE = [
MemoryPDP11.prototype.readByteBE,
MemoryPDP11.prototype.readShortBE,
MemoryPDP11.prototype.writeByteBE,
MemoryPDP11.prototype.readShortBE,
MemoryPDP11.prototype.writeShortBE
];
MemoryPDP11.afnArrayLE = [
MemoryPDP11.afnArrayLE = [
MemoryPDP11.prototype.readByteLE,
MemoryPDP11.prototype.readShortLE,
MemoryPDP11.prototype.writeByteLE,
MemoryPDP11.prototype.readShortLE,
MemoryPDP11.prototype.writeShortLE
];
}