Roland McGrath writes:
> For PPC32 signal handlers, while the frame itself was of properly aligned
> size, no alignment of the starting stack pointer was done at all, so that a
> signal handler can still get a misaligned stack pointer if the interrupted
> registers had one, though the kernel isn't
Both the PPC32 and PPC64 ABIs specify that the stack should be kept aligned
to 16 bytes. However, signal handlers on PPC64 are getting run with the
stack misaligned (sp % 16 == 8). This patch fixes that by ensuring that
the signal frame allocated is a multiple of 16 bytes. The PPC32 signal
frame
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