New improved I/O handler functions for the PDP-11
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Jeff
Jeff Parsons
parent
c61876a568
commit
dfe367f53d
18 changed files with 847 additions and 1059 deletions
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@ -417,7 +417,19 @@ Memory.prototype = {
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/**
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* setAccess(afn, fDirect)
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*
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* If no function table is specified, a default is selected based on the Memory type.
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* The afn parameter should be a 6-entry function table containing two byte handlers, two
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* short handlers, and two long handlers. See the static afnMemory table for an example.
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*
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* If no function table is specified, a default is selected based on the Memory type;
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* similarly, any undefined entries in the table are filled with default handlers that fall
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* back to the byte handlers, and if one or both byte handlers are undefined, they default
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* to handlers that simply ignore the access.
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*
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* fDirect indicates that both the default AND the direct handlers should be updated. Direct
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* handlers normally match the default handlers, except when "checked" handlers are installed;
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* this allows "checked" handlers to know where to dispatch the call after performing checks.
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* Examples of checks are read/write breakpoints, but it's really up to the Debugger to decide
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* what the check consists of.
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*
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* @this {Memory}
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* @param {Array.<function()>} [afn] function table
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@ -448,13 +460,13 @@ Memory.prototype = {
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setReadAccess: function(afn, fDirect) {
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if (!fDirect || !this.cReadBreakpoints) {
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this.readByte = afn[0] || this.readNone;
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this.readShort = afn[1] || this.readShortDefault;
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this.readLong = afn[2] || this.readLongDefault;
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this.readShort = afn[2] || this.readShortDefault;
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this.readLong = afn[4] || this.readLongDefault;
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}
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if (fDirect || fDirect === undefined) {
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this.readByteDirect = afn[0] || this.readNone;
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this.readShortDirect = afn[1] || this.readShortDefault;
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this.readLongDirect = afn[2] || this.readLongDefault;
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this.readShortDirect = afn[2] || this.readShortDefault;
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this.readLongDirect = afn[4] || this.readLongDefault;
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}
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},
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/**
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@ -466,13 +478,13 @@ Memory.prototype = {
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*/
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setWriteAccess: function(afn, fDirect) {
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if (!fDirect || !this.cWriteBreakpoints) {
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this.writeByte = !this.fReadOnly && afn[3] || this.writeNone;
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this.writeShort = !this.fReadOnly && afn[4] || this.writeShortDefault;
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this.writeByte = !this.fReadOnly && afn[1] || this.writeNone;
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this.writeShort = !this.fReadOnly && afn[3] || this.writeShortDefault;
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this.writeLong = !this.fReadOnly && afn[5] || this.writeLongDefault;
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}
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if (fDirect || fDirect === undefined) {
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this.writeByteDirect = afn[3] || this.writeNone;
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this.writeShortDirect = afn[4] || this.writeShortDefault;
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this.writeByteDirect = afn[1] || this.writeNone;
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this.writeShortDirect = afn[3] || this.writeShortDefault;
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this.writeLongDirect = afn[5] || this.writeLongDefault;
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}
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},
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@ -1507,25 +1519,85 @@ Memory.prototype = {
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};
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/*
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* This is the effective definition of afnNone, but we need not fully define it, because setAccess()
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* uses these defaults when any of the 6 handlers (ie, 3 read handlers and 3 write handlers) are undefined.
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* This is the effective definition of afnNone, but we need not fully define it, because setAccess() uses these
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* defaults when any of the 6 handlers (ie, 2 byte handlers, 2 short handlers, and 2 long handlers) are undefined.
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*
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Memory.afnNone = [Memory.prototype.readNone, Memory.prototype.readShortDefault, Memory.prototype.readLongDefault, Memory.prototype.writeNone, Memory.prototype.writeShortDefault, Memory.prototype.writeLongDefault];
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Memory.afnNone = [
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Memory.prototype.readNone,
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Memory.prototype.writeNone,
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Memory.prototype.readShortDefault,
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Memory.prototype.writeShortDefault,
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Memory.prototype.readLongDefault,
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Memory.prototype.writeLongDefault
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];
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*/
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Memory.afnNone = [];
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Memory.afnNone = [];
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Memory.afnMemory = [Memory.prototype.readByteMemory, Memory.prototype.readShortMemory, Memory.prototype.readLongMemory, Memory.prototype.writeByteMemory, Memory.prototype.writeShortMemory, Memory.prototype.writeLongMemory];
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Memory.afnChecked = [Memory.prototype.readByteChecked, Memory.prototype.readShortChecked, Memory.prototype.readLongChecked, Memory.prototype.writeByteChecked, Memory.prototype.writeShortChecked, Memory.prototype.writeLongChecked];
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Memory.afnMemory = [
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Memory.prototype.readByteMemory,
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Memory.prototype.writeByteMemory,
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Memory.prototype.readShortMemory,
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Memory.prototype.writeShortMemory,
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Memory.prototype.readLongMemory,
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Memory.prototype.writeLongMemory
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];
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Memory.afnChecked = [
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Memory.prototype.readByteChecked,
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Memory.prototype.writeByteChecked,
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Memory.prototype.readShortChecked,
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Memory.prototype.writeShortChecked,
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Memory.prototype.readLongChecked,
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Memory.prototype.writeLongChecked
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];
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if (PAGEBLOCKS) {
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Memory.afnPaged = [Memory.prototype.readBytePaged, Memory.prototype.readShortPaged, Memory.prototype.readLongPaged, Memory.prototype.writeBytePaged, Memory.prototype.writeShortPaged, Memory.prototype.writeLongPaged];
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Memory.afnUnpaged = [Memory.prototype.readByteUnpaged, Memory.prototype.readShortUnpaged, Memory.prototype.readLongUnpaged, Memory.prototype.writeByteUnpaged, Memory.prototype.writeShortUnpaged, Memory.prototype.writeLongUnpaged];
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Memory.afnPaged = [
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Memory.prototype.readBytePaged,
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Memory.prototype.writeBytePaged,
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Memory.prototype.readShortPaged,
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Memory.prototype.writeShortPaged,
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Memory.prototype.readLongPaged,
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Memory.prototype.writeLongPaged
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];
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Memory.afnUnpaged = [
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Memory.prototype.readByteUnpaged,
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Memory.prototype.writeByteUnpaged,
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Memory.prototype.readShortUnpaged,
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Memory.prototype.writeShortUnpaged,
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Memory.prototype.readLongUnpaged,
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Memory.prototype.writeLongUnpaged
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];
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}
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if (TYPEDARRAYS) {
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Memory.afnArrayBE = [Memory.prototype.readByteBE, Memory.prototype.readShortBE, Memory.prototype.readLongBE, Memory.prototype.writeByteBE, Memory.prototype.writeShortBE, Memory.prototype.writeLongBE];
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Memory.afnArrayLE = [Memory.prototype.readByteLE, Memory.prototype.readShortLE, Memory.prototype.readLongLE, Memory.prototype.writeByteLE, Memory.prototype.writeShortLE, Memory.prototype.writeLongLE];
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Memory.afnPagedLE = [Memory.prototype.readBytePLE, Memory.prototype.readShortPLE, Memory.prototype.readLongPLE, Memory.prototype.writeBytePLE, Memory.prototype.writeShortPLE, Memory.prototype.writeLongPLE];
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Memory.afnArrayBE = [
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Memory.prototype.readByteBE,
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Memory.prototype.writeByteBE,
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Memory.prototype.readShortBE,
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Memory.prototype.writeShortBE,
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Memory.prototype.readLongBE,
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Memory.prototype.writeLongBE
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];
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Memory.afnArrayLE = [
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Memory.prototype.readByteLE,
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Memory.prototype.writeByteLE,
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Memory.prototype.readShortLE,
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Memory.prototype.writeShortLE,
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Memory.prototype.readLongLE,
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Memory.prototype.writeLongLE
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];
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Memory.afnPagedLE = [
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Memory.prototype.readBytePLE,
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Memory.prototype.writeBytePLE,
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Memory.prototype.readShortPLE,
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Memory.prototype.writeShortPLE,
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Memory.prototype.readLongPLE,
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Memory.prototype.writeLongPLE
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];
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}
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if (NODE) module.exports = Memory;
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