[RFA] epilogue unwinder for i386 (reverse 1/2)

Michael Snyder msnyder@vmware.com
Sat Jul 4 00:26:00 GMT 2009

This comes out of a discussion with Daniel, about how gcc
does not generate the right dwarf info to allow correct
frame unwinding in function epilogues, causing frame_unwind
to return bad results.

It's necessary for reverse-step, which will frequently step
backward to the return instruction of a function.  But it also
provides an improvement for forward debugging, in that now,
without this change, if you STEPI until you are at the return
instruction, you will get a bad backtrace.

The infrun changes that take advantage of this patch will follow


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