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Date:      Sun, 10 Nov 2002 11:35:20 -0500 (EST)
From:      Andrew Gallatin <gallatin@cs.duke.edu>
To:        Poul-Henning Kamp <phk@FreeBSD.ORG>
Cc:        alpha@FreeBSD.ORG
Subject:   Re: ev4/5/6 issue ?
Message-ID:  <15822.35528.984561.534904@grasshopper.cs.duke.edu>
In-Reply-To: <51801.1036863194@critter.freebsd.dk>
References:  <51801.1036863194@critter.freebsd.dk>

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Poul-Henning Kamp writes:
 > 
 > An alphastation255 has found its way to my lab but I'm having a spot of
 > trouble getting it into workable state.
 > 
 > I installed an iso which jhb@ had produced and the system boots.
 > 
 > But make(1) coredumps with illegal instruction.
 > 
 > I've tried to compile a make(1) on beast (setting CPUTYPE="") but it
 > also core-dumps.  I pressume that's because the libs are ev6.
 > 

An illegal instruction trap occurs when the processor attempts to
execute an instruction which it does not recognize.  We attempt to
fixup the most common instructions in the kernel (mainly so you can
run the acrobat reader binary on older alphas..)

However, beast is a 21264a and it supports all valid alpha
instructions.  So rather than a bug in the opdec code, I suspect that
the compiler or linker is emitting bad code, or something else weird
is happening.

What instruction is causing the trap?

Drew

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