Re: [Freedos-kernel] Re: 32RTM bug

[Luchezar G. <lu...@co...>]

Hallo Bart,

>>       case 0x34:
>>         lr.ES = FP_SEG(&InDOS);
>>         lr.BX = FP_SEG(&InDOS);
>>         break;
>>
>> What could be wrong here?
>
> Copy and paste is broken where you are.

Not copy and paste, my head is broken because I typed it by hand! ;-)

> with
>           lr.BX = FP_OFF(&InDOS);
> it would be correct. But that's what it does in my source so...

Of course it's FP_OFF, not FP_SEG for lr.BX - I just mistyped it :-(

>> Stack usage during the call?
>
> that's what I suspected. Eric suggested (in a private email) to make 
> int21/ah=34 reentrant like we did for 25 and 35. However than it would 
> completely execute on the user stack and that stack seemed to have been 
> the problem (only 30 words?).

How do you know that the user stack is just 30 words?

> Since you said commenting out calls to the int2a handler didn't help... 
> The only other extra stack user is the macro for 386 registers. Perhaps 
> compiling for <386 or pushing/popping these on the kernel stack would 
> work around that.

I tried a 80186 kernel but the result is the same. I don't know how to 
implement the other suggestion but because of the test results so far I'm 
not sure if the problem is indeed the stack.

Regards,
Lucho