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On Aug 1, 2004, at 01:58, Geoffrey Keating wrote:Sounds like a bug in MD_FALLBACK_FRAME_STATE_FOR on your platform. I'd suggest looking at the powerpc-darwin implementation for an indication of how to get this right.
For signal handlers (esp. as a result of a trapping insn) you do not generally want the instruction after the one that faulted, as that would be ill-defined for an indirect jump with an invalid address for example.
However, I believe that the unwinder always subtracts one (byte/word) from the return address in order to get the right context for the exception in the normal call case: a new exception handling region might start right after the call instruction. So to compensate for that you'd have to add one (byte/word) to the address of the faulting instruction in MD_FALLBACK_FRAME_STATE_FOR.
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