pc386dx exception 6 was Re: 4.6.0pre2 and docs released

Angelo Fraietta angelo_f at bigpond.com
Thu Apr 24 22:22:53 UTC 2003

Joel Sherrill wrote:

>Angelo Fraietta wrote:
>>Joel Sherrill wrote:
>>>I am in agreement with Ralf's hunch here.  including iostream is bound
>>>to be
>>>putting some ctor in the system.  It has to be doing something that is
>>>legal on a vanilla i386 system.  It could be because of inline assembly
>>>is not i386 pure or incorrect code generation for pure i386 that no one
>>>has noticed because most people are Pentium and above for Linux, BSD,
>>>We really need to know that address of the illegal instruction so we can
>>>figure out where it is coming from.  Fixing it then will probably be
>>So how do I find the address?
>If you don't have visibility with a debugger, then all I know to do is 
>modify the default exception handler to print the eip somewhere you 
>can see it.
>When I look at _defaultExcHandler in cpukit/score/cpu/i386/cpu.c, 
>it already is printing eip.  Are you sure it isn't there?  If it 
>has scrolled off, move the print with the eip to the end so it 
>is visible or switch the console to a com port so you have scroll
PC 104125

The instructions there are

104125:	f0 0f c1 05 5c 0d 15 	lock xadd %eax,0x150d5c

Angelo Fraietta

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