Searching forum for <ILLEGAL OP CODE> crashes page

benoitstjean · Posted: Fri Jan 29, 2021 7:37 am

haha... So I'm trying to search this forum for the keyword "ILLEGAL OP CODE" because somehow my unit rebooted with this error yesterday but when I type this exact string <ILLEGAL OP CODE> in the forum search box, the page returns the following error message:

Fatal error: Allowed memory size of 31457280 bytes exhausted (tried to allocate 65536 bytes) in /var/www/ccsinfo/forum/search.php on line 509

haha. That's funny.

So now, my question is if there's a way to 'catch' this error, perhaps the address where it occurs similar to the code to catch the INT_ADDRERR interrupt?

Using the PIC24EP on 5.026.

Thanks.

Ben

temtronic · Posted: Fri Jan 29, 2021 8:15 am

Probably crashed cause it's so dang cold here in Ontario !

Have to ask, is there a 'global' error function in 'C' ?

When I was coding in QB45, there was an 'ON ERROR......." command, so you could 'trap' on any error, then do 'something' based on the error code number. Back of the book (yeah we HAD books then, there was a list of all the error code numbers and what they meant).

brrrrr

Ttelmah · Joined: 11 Mar 2010 Posts: 19540

Illegal op-code, only causes a reset. No trap.
However it can be caused by two things. The first is 'what it says', trying to
execute a memory address containing an impossible instruction. The second
is it can also be triggered by trying to access memory using the W
register, when this is uninitialised.
Commonest 'reason;, is popping an illegal return address from
the stack. So something overwriting the stack area.
I'd look at writing a diagnostic byte to a variable, and set this to
different values through the code, then when the reset occurs you can
narrow down massively where is had got to.

benoitstjean · Posted: Fri Jan 29, 2021 11:09 am

Ok thanks. I guess for now it's not critical, first time I see this.

And not sure who manages this website but as stated in my original message, trying to search this forum for the keyword "ILLEGAL OP CODE" in the search box crashed the page! Problem is reproducible!

Cheers!

Ben

temtronic · Posted: Fri Jan 29, 2021 6:18 pm

gee Ben, after it was 'ILLEGAL'..... Laughing

Actually just tested it. 99 hits, YOURS was #1 !!!!

Ttelmah · Joined: 11 Mar 2010 Posts: 19540

The forum administrators themselves can't do anything about this.
The forum itself is based upon an 'off the shelf' program, and it is the
code in this that is having the issue. However the search works OK if
you select the second 'all terms' search form, rather than the first.
However as Jay says, there have not been any posts about this.
The search returns 99 hits, but none are for this exact form.
Must admit, I've never seen one in many years. It is a 'rare beasty'....

temtronic · Posted: Sat Jan 30, 2021 5:23 am

re: ..Must admit, I've never seen one in many years. It is a 'rare beasty'...

so 'only in Canada,eh' !

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

Use google to search the Microchip forums:

jeremiah · Joined: 20 Jul 2010 Posts: 1354

Ttelmah · Joined: 11 Mar 2010 Posts: 19540

It's actually the word 'code' that causes the crash. Problem is that just
about every thread in the forum mentions 'code' somewhere. Using the
top search says 'search for any term'. So the search in the board just
runs out of memory trying to search for a term that applies in so many
places!...
Using 'search for all terms', narrows it down. Or just look for 'illegal op'.

benoitstjean · Posted: Sun Jan 31, 2021 3:00 pm

haha! Ok! Thanks all. Yeah I guess it makes sense that if the seach contains 'code' then it'll freak out.

Have a good one!

Ben