Re: [RFA] SH prologue recognition update

[Chris Faylor <cgf at cygnus dot com>]

On Fri, Apr 21, 2000 at 04:00:31PM +1000, Andrew Cagney wrote:
>Chris Faylor wrote:
>> 
>> The following changes were necessary to get sh-tdep.c working with the
>> Windows CE SH target.  They seem to accomodate the prologue found in
>> more recent version of gdb.  I've also added an additional defensive
>> check to sh_find_callers_reg.
>
>Is there a need for the (dreaded?) heuristic_fence_post in this code? 
>What is the chance of GDB just plowing through memory looking for the
>end of the prologue?

It's already bounded.  It should only look for 28 instructions or so.
This seems to be slightly more than the longest prologue I could produce
but it's probably not perfect.

>The other question is, does WinCE/SH GCC output the same prologe as for
>other SH targets such as sh-coff(?) and sh-elf?  Playing around with the
>prologue analysis code is hairy so I'm trying to figure out how much
>testing is practical.

AFAIK, yes.  I actually imported the latest sh/gcc code into the WinCE branch.
It looks pretty certain that the prologue may have changed and that my
code makes at least a slightly better stab at finding it.

However, once again (hangs head in shame), I could have run this through the
test suite but I didn't.  I'll try that now.

cgf