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

Working prefetch support (speeds up 80386 operation when paging)

Browse source
This commit is contained in:
Jeff Parsons 2015-10-27 11:25:02 -07:00
commit 526da018d0
5 changed files with 256 additions and 458 deletions
Download patch file Download diff file Expand all files Collapse all files

19
modules/pcjs/lib/debugger.js
View file

@ -200,6 +200,12 @@ function Debugger(parmsDbg)
this.aBreakExec = this.aBreakRead = this.aBreakWrite = [];
this.clearBreakpoints();
/*
* The new "bn" command allows you to specify a number of instructions to execute and then stop;
* "bn 0" disables any outstanding count.
*/
this.nBreakIns = 0;
/*
* Execution history is allocated by historyInit() whenever checksEnabled() conditions change.
* Execution history is updated whenever the CPU calls checkInstruction(), which will happen
@ -3885,7 +3891,7 @@ if (DEBUGGER) {
*/
Debugger.prototype.checksEnabled = function(fRelease)
{
return ((DEBUG && !fRelease)? true : (this.aBreakExec.length > 1 || this.messageEnabled(Messages.INT) /* || this.aBreakRead.length > 1 || this.aBreakWrite.length > 1 */));
return ((DEBUG && !fRelease)? true : (this.aBreakExec.length > 1 || !!this.nBreakIns || this.messageEnabled(Messages.INT) /* || this.aBreakRead.length > 1 || this.aBreakWrite.length > 1 */));
};
/**
@ -3902,6 +3908,9 @@ if (DEBUGGER) {
Debugger.prototype.checkInstruction = function(addr, nState)
{
if (nState > 0) {
if (this.nBreakIns && !--this.nBreakIns) {
return true;
}
if (this.checkBreakpoint(addr, 1, this.aBreakExec)) {
return true;
}
@ -5776,6 +5785,8 @@ if (DEBUGGER) {
* These two new commands operate as toggles so that if "*" is used to trap all input (or output),
* you can also use these commands to NOT trap specific ports.
*
* bn [n] break after [n] instructions
*
* TODO: Update the "bl" command to include any/all I/O breakpoints, and the "bc" command to
* clear them. Because "bi" and "bo" commands are piggy-backing on Bus functions, those breakpoints
* are currently outside the realm of what the "bl" and "bc" commands are aware of.
@ -5796,6 +5807,7 @@ if (DEBUGGER) {
this.println("\tbw [a]\tset write breakpoint at addr [a]");
this.println("\tbc [a]\tclear breakpoint at addr [a]");
this.println("\tbl\tlist all breakpoints");
this.println("\tbn [n]\tbreak after [n] instruction(s)");
return;
}
var sParm = sCmd.charAt(1);
@ -5807,6 +5819,11 @@ if (DEBUGGER) {
if (!cBreaks) this.println("no breakpoints");
return;
}
if (sParm == 'n') {
this.nBreakIns = this.parseValue(sAddr);
this.println("break after " + this.nBreakIns + " instruction(s)");
return;
}
if (sAddr === undefined) {
this.println("missing breakpoint address");
return;