cvs commit: src/sys/powerpc/powerpc machdep.c trap.c trap_subr.S
grehan at FreeBSD.org
Sat Jul 30 11:14:32 GMT 2005
grehan 2005-07-30 11:14:31 UTC
FreeBSD src repository
sys/powerpc/powerpc machdep.c trap.c trap_subr.S
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
Revision Changes Path
1.90 +3 -0 src/sys/powerpc/powerpc/machdep.c
1.55 +5 -0 src/sys/powerpc/powerpc/trap.c
1.15 +8 -0 src/sys/powerpc/powerpc/trap_subr.S
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