2003-10-23 Jeff Johnston <jjohnstn@redhat.com>

        * ia64-tdep.c: (ia64_frame_cache): Add new prev_cfm field.
        (pseudo_regs): Add comment regarding register stack registers.
        (ia64_alloc_frame_cache):  Initialize new prev_cfm field to 0.
        (floatformat_valid): New static routine.
        (floatformat_ia64_ext): Add name field and set up is_valid routine
        to floatformat_valid().
        (examine_prologue):  For the previous cfm, use
        frame_unwind_register()
        if the cfm is not stored in a register-stack register.  Save the
        previous cfm value in the prev_cfm field.  Add debug output.
        (ia64_frame_this_id): Use frame_id_build_special() to also register
        the bsp.  Add debug output.
        (ia64_sigtramp_frame_this_id): Ditto.
        (ia64_frame_prev_register):  Look at cache saved_regs for a few more
        registers and also add some checks for framelessness before accepting
        current register values for fields such as return address.  For cfm,
        use the cached prev_cfm field if available.  Add comment to explain
        PSR logic.  Add debug output.
        (ia64_sigtramp_frame_init_saved_regs): Save the bsp and sp addresses
        as part of initialization.
        (ia64_sigtramp_frame_cache): Hard-code stack size as it can't be
        calculated.  Cache the bsp and cfm values.
        (ia64_sigtramp_frame_prev_register): Add logic to this routine out
        instead of using ia64_frame_prev_register() which doesn't expect most
        registers to be saved.  The saved values for bsp and sp
        can be taken from the cache.  Add debug output.
        (ia64_push_dummy_call): Use frame_id_build_special() to also register
        the bsp.

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