prologue detection

[Jim Keniston]

On Fri, 2006-04-07 at 07:21, Frank Ch. Eigler wrote:
> Hi -
> 
> While trying to run some measurements on the static instrumentation
> code, I came across an amusing and troubling bug in the translator's
> prologue-detection heuristic.  For some classes of functions (in this
> case, prologue-less ones), it would get it totally wrong, and
> designate an instruction within a subsequent block.  I've seen one
> case where the probe was placed *beyond* the requested function.  
> 
> I'm taking a little detour to try to simplify & fix this part up.  In
> the mean time, you may want to double-check the placement of probes in
> your scripts, especially when on short funtions.  Please send me
> anything suspicious that you may have recently seen.
> 
> - FChE

As you may remember, bugzilla #2453 documents one such bug that in turn
revealed a powerpc kprobes bug.  There was supposed to be a separate bug
opened for the prologue-detection error, but I don't know whether that
happened.

Jim