Date: Wed, 2 Aug 2006 06:47:29 GMT From: John Birrell <jb@FreeBSD.org> To: Perforce Change Reviews <perforce@freebsd.org> Subject: PERFORCE change 102998 for review Message-ID: <200608020647.k726lTfW010581@repoman.freebsd.org>
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http://perforce.freebsd.org/chv.cgi?CH=102998 Change 102998 by jb@jb_freebsd2 on 2006/08/02 06:47:22 Save the %pc and %tick registers in the per-cpu structure for debug purposes while trying to track down the problem of the wandering CPU taking up gardening. In the sun4v_stable tree, this change actually stopped the panic from happening, but that can't be because anything is fixed here... just that something has changed. Affected files ... .. //depot/projects/dtrace/src/sys/sun4v/sun4v/interrupt.S#4 edit Differences ... ==== //depot/projects/dtrace/src/sys/sun4v/sun4v/interrupt.S#4 (text+ko) ==== @@ -29,6 +29,7 @@ __FBSDID("$FreeBSD: src/sys/sparc64/sparc64/interrupt.S,v 1.8 2005/04/16 15:05:56 marius Exp $"); #include "opt_simulator.h" +#include "opt_trap_trace.h" #include <machine/hypervisorvar.h> #include <machine/asi.h> #include <machine/asmacros.h> @@ -437,6 +438,25 @@ membar #Sync GET_PCPU_PHYS_SCRATCH(%g6) wr %g0, ASI_REAL, %asi + +#ifdef TRAP_TRACING + /* pcpu->pad[0] = %pc */ + rd %pc, %g4 + stxa %g4, [PCPU(PAD)]%asi + + /* pcpu->pad[1] = %tick */ + rdpr %tick, %g4 + stxa %g4, [PCPU(PAD) + 8]%asi + + /* + * Increment a counter which might help us notice if we're + * stuck in a loop. pcpu->pad[2] = count + */ + ldxa [PCPU(PAD) + 16]%asi, %g4 + add %g4, 1, %g4 + stxa %g4, [PCPU(PAD) + 16]%asi +#endif + lda [PCPU(CPUMASK)]%asi, %g4 lda [%g3]%asi, %g1 1: or %g1, %g4, %g2
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