[Bug 224872] powerpc64: throwing a fast kernel trap

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=224872

            Bug ID: 224872
           Summary: powerpc64: throwing a fast kernel trap
           Product: Base System
           Version: CURRENT
          Hardware: powerpc
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: breno.leitao at gmail.com

Trying to use DDB on powerpc64, I found that it throws a 0x400 exception.

OK boot -d
Booting...
Kernel entry at 0x102620 ...
KDB: debugger backends: ddb
KDB: current backend: ddb
KDB: enter: Boot flags requested debugger
[ thread pid 0 tid 0 ]
Stopped at      .kdb_enter+0x60:        ld      r2, r1, 0x28


db> break platform_smp_start_cpu
db> continue

fatal kernel trap:

   exception       = 0x400 (instruction storage interrupt)
   virtual address = 0x426f6f7420666c60
   srr0            = 0x426f6f7420666c60 (0x426f6f7420666c60)
   srr1            = 0x8000000040001032
   lr              = 0x426f6f7420666c61 (0x426f6f7420666c61)
   curthread       = 0x114a100
          pid = 0, comm = 

[ thread pid 0 tid 0 ]
Stopped at      0x426f6f7420666c60

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