No unwind data for ivt.S

There is no unwind data in arch/ia64/kernel/ivt.S nor minstate.h (patch 2.4.0-test10-ia64-001115) which makes it impossible to unwind past an interrupt. Before I start on this code, has anybody already added unwind data to ivt.S?

Forget it, my error. The problem was an old linker that did not sort the unwind data. By sheer coincidence the search algorithm found all the correct unwind entries down to but not including the interrupt handler - every time!