K 10
svn:author
V 6
grehan
K 8
svn:date
V 27
2005-08-08T07:02:12.000000Z
K 7
svn:log
V 1379
MFC  machdep.c r1.90
     trap.c    r1.55
     trap_subr.S r1.15

   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.

Approved by:	re (Ken Smith)

END