[Bug 225321] dtrace/powerpc64: System crash

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225321

--- Comment #2 from Breno Leitao <breno.leitao at gmail.com> ---
Hi Justin,

We are debugging this one in background, and the problem seems to be a wrong
stack  pointer (r1). Mainly after restoring it at
sys/powerpc/aim/trap_subr64.S:

ASENTRY_NOPROF(breakpoint)
        ....

dbtrap:
        /* Write the trap vector to SPRG3 by computing LR & 0xff00 */
        mflr    %r1
        andi.   %r1,%r1,0xff00
        mtsprg3 %r1

        ld      %r1,TRAP_TOCBASE(0)             /* get new SP */
        ld      %r1,TOC_REF(tmpstk)(%r1)
        addi    %r1,%r1,(TMPSTKSZ-48)


We have a working patch already, and I would suggest the authors to share it.

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