Unwind code. It is impossible to obtain IA64 saved registers or back
trace the calling sequence without using the unwind API. That API
relies on decent unwind data being associated with each function
prologue, stack adjustment, save of return registers etc. Not an issue
for C code, it is for Assembler where the unwind info has to be hand
coded to match what the asm is doing. IA64 also has PAL code which is
called directly by the kernel, that PAL code has no unwind data so
failures in PAL code result in bad or incomplete back traces.
Unwind is not supposed to fail, it should detect bad input data and
avoid errors. Alas, sometimes it does fail.
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