9ac516a6f1
Summary: Running a 32-bit process on a 64-bit POWER CPU may still use all 64-bits in calculations, while ignoring the upper 32 bits for addressing storage. It so happens that some processes end up with r1 (SP) having bit 31 set in some cases (33-bit address). Writing out to this 33-bit address obviosly fails. Since the CPU ignores the upper bits, we should as well. sendsig() and cpu_fetch_syscall_args() appear to be the only functions that actually rely on userspace register values for copy in/out, and cpu_fetch_syscall_args() doesn't seem to be bitten in practice yet. Reviewed By: luporl Differential Revision: https://reviews.freebsd.org/D20896
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