Hmm,

(I think I might split this in two)

The attached adds the methods:

+extern void frame_read_signed_register (struct frame_info *frame,
+                                       int regnum, LONGEST *val);
+extern void frame_read_unsigned_register (struct frame_info *frame,
+                                         int regnum, ULONGEST *val);

These correspond to the frame_unwind_XXXX methods() except that they 
return the value of a register in THIS frame rather than the value of 
the register in the PREVIOUS frame.

They are simply convenience functions to make it easier to obtain a 
specified frame's register value.

Thoughts?

--

The h8300-tdep.c target's ``info registers'' routines are then updated 
so that:

- Use the frame_read_XXX_register() instead of read_register().
`info registers' displays the registers of the selected frame and not 
the inner most frame.

- Implement the current print_registers_info() interface

Not sure how to test it though.  Anyone want to try this?

Andrew