On Wed, Aug 15, 2007 at 02:31:40PM -0700, David Wilder wrote:
> Placing a kprobe on "bc" instruction (s390/s390x) can cause an oops.
> The instruction length is encoded into the first two bits of the s390
> instruction. Kprobe is incorrectly computing the instruction length.
> The instruction length is used for determining what type of "fix-up" is
> needed for conditional branch instruction. The problem can bee seen by
> placing a kprobe on a "bc" instruction that will not branch. The results
> is that Kprobe incorrectly computes the new instruction pointer
> (psw.addr) after single stepping the instruction. The problem is
> corrected with this patch.
>
> /* save the instruction length (pop 5-5) in bytes */
> - switch (*(__u8 *) (ainsn->insn) >> 4) {
> + switch (*(__u8 *) (ainsn->insn) >> 6) {
> case 0:
Added to the s390 patch queue. Thanks! :)
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