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I have finally worked this one out -- I have been chasing two different faults.
The first error was caused by not checking the return value of an open routine.
This caused the code to jump to an address given by an invalid function pointer
(this was because the open failed). This is why modifying the code in what
seemed unrelated areas to fail -- this was related to where the code was
jumping to in the invalid function pointer.<br>
<br>
The second fault is that the stack on the initial thread has become over
run when creating the other tasks. I was able to ascertain this by commenting
out code further into the call stack until the fault no longer occurred.
I overcame this by calling the functions that start these threads within
the context of the task with the largest stack size.<br>
<br>
The difference between the DX and the SX may have had something to do with
the way memory is treated by the processors.<br>
<br>
Angelo Fraietta wrote:<br>
<blockquote type="cite" cite="mid:3CD217B3.90600@bigpond.com"> The really
frustrating part of this is that I have a build that runs fine on the DX,
but if I attempt to run it on the DIMMPC it crashes. I have the same amount
of memory on both machines, and the section of code that causes it to crash
used to run fine.<br>
<br>
Angelo Fraietta wrote:<br>
<blockquote type="cite" cite="mid:3CD20D7A.10009@bigpond.com"> I now
have the problem again. The error I get from the DIMMPC (which is an SX)
is as follows:<br>
<br>
Exception 6 caught at PC 3ff091 by thread 134283266<br>
<br>
EAX = 7d203cf7 EBX = 0 ECX = 74 EDX = F000e2c3<br>
ESi = 2 EDI = 0 EBP = 18D5BF ESP = CE4<br>
<br>
Errror code (if not 0) = 0<br>
<br>
For the 386DX, I get This error<br>
<br>
Exception 13 caught at PC1 by thread 134283266<br>
EAX = 0 EBX = 0 ECX = 1C EDX = F000e2c3<br>
ESi = 0 EDI = 173EF8 EBP = 18E384 ESP = 18E324<br>
<br>
Error code (if not 0) = F000<br>
<br>
If I start adding and removing sections of code, the error changes. For
example, I removed code from within an interrupt handler that I had not enabled,
the error has gone.<br>
<br>
Any suggestions on What to Do?<br>
<br>
<br>
Joel Sherrill wrote:<br>
<blockquote type="cite" cite="mid:3CB5D91C.B58788B9@OARcorp.com">
<pre wrap=""><br>Angelo Fraietta wrote:<br></pre>
<blockquote type="cite">
<pre wrap="">I forgot to say I am using pc386dx bsp<br><br>Angelo Fraietta wrote:<br><br></pre>
<blockquote type="cite">
<pre wrap="">What could be causing an exception 6. I have looked in cpu.h and it<br>saya it is an illegal instruction.<br>What causes this type of fault?<br><br></pre>
</blockquote>
</blockquote>
<pre wrap=""><!----><br>I think this means invalid instruction which likely means you have<br>corrupt code or jumped somewhere wrong.<br><br>Was the reported address inside or outside your program?<br><br></pre>
<blockquote type="cite">
<pre wrap="">--<br>Angelo Fraietta<br><br>PO Box 859<br>Hamilton NSW 2303<br><br>Home Page<br><br><a class="moz-txt-link-freetext" href="http://www.users.bigpond.com/angelo_f/">http://www.users.bigpond.com/angelo_f/</a><br><br>There are those who seek knowledge for the sake of knowledge - that is CURIOSITY<br>There are those who seek knowledge to be known by others - that is VANITY<br>There are those who seek knowledge in order to serve - that is LOVE<br> Bernard of Clairvaux (1090 - 1153)<br></pre>
</blockquote>
<pre wrap=""><!----><br></pre>
</blockquote>
<br>
<pre class="moz-signature" cols="$mailwrapcol">-- <br>Angelo Fraietta<br><br>PO Box 859<br>Hamilton NSW 2303<br><br>Home Page<br><br><br><a class="moz-txt-link-freetext" href="http://www.users.bigpond.com/angelo_f/">http://www.users.bigpond.com/angelo_f/</a><br><br>There are those who seek knowledge for the sake of knowledge - that is CURIOSITY<br>There are those who seek knowledge to be known by others - that is VANITY<br>There are those who seek knowledge in order to serve - that is LOVE<br> Bernard of Clairvaux (1090 - 1153)</pre>
<br>
</blockquote>
<br>
<pre class="moz-signature" cols="$mailwrapcol">-- <br>Angelo Fraietta<br><br>PO Box 859<br>Hamilton NSW 2303<br><br>Home Page<br><br><br><a class="moz-txt-link-freetext" href="http://www.users.bigpond.com/angelo_f/">http://www.users.bigpond.com/angelo_f/</a><br><br>There are those who seek knowledge for the sake of knowledge - that is CURIOSITY<br>There are those who seek knowledge to be known by others - that is VANITY<br>There are those who seek knowledge in order to serve - that is LOVE<br> Bernard of Clairvaux (1090 - 1153)</pre>
<br>
</blockquote>
<br>
<pre class="moz-signature" cols="$mailwrapcol">--
Angelo Fraietta
PO Box 859
Hamilton NSW 2303
Home Page
<a class="moz-txt-link-freetext" href="http://www.users.bigpond.com/angelo_f/">http://www.users.bigpond.com/angelo_f/</a>
There are those who seek knowledge for the sake of knowledge - that is CURIOSITY
There are those who seek knowledge to be known by others - that is VANITY
There are those who seek knowledge in order to serve - that is LOVE
Bernard of Clairvaux (1090 - 1153)</pre>
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