exception handling poll

[meissner@cygnus.com]

| The PPC problem is probably more difficult to address.  The code generate
| for vfprintf saves an FP regsiter in the prolog because of the path for FP
| numbers.  So even if you do not print an FP number, you still end up
| touching the FPU.

No, it is not a problem on the PPC at all.  The PPC ships different versions of
the libraries, based on endianess, whether floating point is done in hardware
or emulated, and whether you use the old sort-of AIX based calling sequence or
the newer eabi.  So, if you use the gcc driver, and add the -msoft-float option
when linking, you will get libraries that do not use the floating point
instructions.  This is true of many of our ports.