Temporary band-aid to fix hang when a process exec's Altivec instructions.

trap_subr.S:  declare a stub for the a-unavailable trap
              that does an absolute jump to the vector-assist trap.
              This is due to the fact that the vec-unavail trap
              doesn't start at a 256-byte boundary, so the trick of
              masking the bottom 8 bits of the link register to identify
              the interrupt doesn't work, so let the vec-assist
              case handle Altivec-disabled for the time being.

              Note that this will be fixed in the future with a much
              smaller vector code-stub (< 16 bytes) that will allow
              use of strange vector offsets that are also present in
              4xx processors, and also allow smaller differences in
              vector codepaths on the G5.

trap.c:       Treat altivec-unavailable/assist process traps as SIGILL.
              Not quite correct, since altivec-assist should really be a panic,
              but it is fine for the moment due to the above measure.

machdep.c     Install the stub code for the altivec-unavailable trap, and
              the standard trap code at the altivec-assist.

Reported by:	Andreas Tobler <toa at pop agri ch>
MFC after:	3 days

1 files changed, 3 insertions, 0 deletions

diff --git a/sys/powerpc/aim/machdep.c b/sys/powerpc/aim/machdep.c
index 75b5918..a74cc27 100644
--- a/sys/powerpc/aim/machdep.c
+++ b/sys/powerpc/aim/machdep.c
@@ -247,6 +247,7 @@ extern void	*dsitrap, *dsisize;
 extern void	*decrint, *decrsize;
 extern void     *extint, *extsize;
 extern void	*dblow, *dbsize;
+extern void	*vectrap, *vectrapsize;
 
 void
 powerpc_init(u_int startkernel, u_int endkernel, u_int basekernel, void *mdp)
@@ -335,6 +336,8 @@ powerpc_init(u_int startkernel, u_int endkernel, u_int basekernel, void *mdp)
 	bcopy(&trapcode, (void *)EXC_SC,   (size_t)&trapsize);
 	bcopy(&trapcode, (void *)EXC_TRC,  (size_t)&trapsize);
 	bcopy(&trapcode, (void *)EXC_FPA,  (size_t)&trapsize);
+	bcopy(&vectrap,  (void *)EXC_VEC,  (size_t)&vectrapsize);
+	bcopy(&trapcode, (void *)EXC_VECAST, (size_t)&trapsize);
 	bcopy(&trapcode, (void *)EXC_THRM, (size_t)&trapsize);
 	bcopy(&trapcode, (void *)EXC_BPT,  (size_t)&trapsize);
 #ifdef KDB