[Bug 225182] devel/powerpc64-xtoolchain-gcc: SLOF Data Storage Exception on boot with kernel built with devel/powerpc64-xtoolchain-gcc

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225182

            Bug ID: 225182
           Summary: devel/powerpc64-xtoolchain-gcc: SLOF Data Storage
                    Exception on boot with kernel built with
                    devel/powerpc64-xtoolchain-gcc
           Product: Ports & Packages
           Version: Latest
          Hardware: powerpc
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: bapt at FreeBSD.org
          Reporter: kennethsalerno at yahoo.com
                CC: freebsd-bugs at FreeBSD.org, freebsd-powerpc at FreeBSD.org
                CC: freebsd-powerpc at FreeBSD.org
             Flags: maintainer-feedback?(bapt at FreeBSD.org)
          Assignee: bapt at FreeBSD.org

+++ This bug was initially created as a clone of Bug #225181 +++

11.1-RELEASE kernel built with XCC devel/powerpc64-xtoolchain-gcc (GCC 6.3.1)
fails to boot from qemu-system-ppc64 -m pseries (SLOF fw) with Data Storage
Exception. Crashes just before CPU detection (following FreeBSD version
banner).

The same kernel built without XCC boots as expected.

Please let me know what output or logs would be useful to troubleshoot this
issue. It is not clear to me if this is a SLOF stack issue or compiler issue.

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