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Implement System/vector for debugging.

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This commit is contained in:
Andrew Alderwick 2022-01-05 17:27:01 +00:00
parent 0fd288de79
commit 4cbb661f48
2 changed files with 13 additions and 2 deletions
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2
projects/examples/blank.tal
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@ -22,7 +22,7 @@
( devices )
|00 @System &vector $2 &wst $1 &rst $1 &pad $4 &r $2 &g $2 &b $2 &debug $1 &halt $1
|00 @System &vector $2 &wst $1 &rst $1 &eaddr $2 &ecode $1 &pad $1 &r $2 &g $2 &b $2 &debug $1 &halt $1
|10 @Console &vector $2 &read $1 &pad $5 &write $1 &error $1
|20 @Screen &vector $2 &width $2 &height $2 &auto $1 &pad $1 &x $2 &y $2 &addr $2 &pixel $1 &sprite $1
|30 @Audio0 &vector $2 &position $2 &output $1 &pad $3 &adsr $2 &length $2 &addr $2 &volume $1 &pitch $1

11
src/devices/system.c
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@ -25,6 +25,16 @@ static const char *errors[] = {
int
uxn_halt(Uxn *u, Uint8 error, Uint16 addr)
{
Device *d = &u->dev[0];
Uint16 vec = d->vector;
if(vec) {
d->vector = 0; /* need to rearm to run System/vector again */
DEVPOKE16(0x4, addr);
d->dat[0x6] = error;
if(error != 2) /* working stack overflow has special treatment */
vec += 0x0004;
return uxn_eval(u, vec);
}
fprintf(stderr, "Halted: %s#%04x, at 0x%04x\n", errors[error], u->ram[addr], addr);
return 0;
}
@ -45,6 +55,7 @@ void
system_deo(Device *d, Uint8 port)
{
switch(port) {
case 0x1: DEVPEEK16(d->vector, 0x0); break;
case 0x2: d->u->wst.ptr = d->dat[port]; break;
case 0x3: d->u->rst.ptr = d->dat[port]; break;
default: system_deo_special(d, port);