Unreviewed patches

[Joern Rennecke]

Andrew Cagney wrote:
> 
> >
> > I think the stashing of constants into the tdep structure is basically
> > wrong.  You separate the register names arrays from the literals
> > that describe their positions, and you replicate the literals
> > up to four times.  The tdep structure and the sh_gdbarch_init
> > function are so large that you have lost track of the things that
> > really belong in tdep, like sh_show_regs, skip_prologue_hard_way,
> > and do_pseudo_register.  If you look at other gdb ports, you'll
> > see that they put only variable stuff in tdep, and use enums
> > for constants.  The sh gdb register naming scheme also doesn't
> > scale well, the names are again duplicated multiple times.
> 
> Can i suggest comparing the SH with the MIPS or RS6000.

MIPS and RS6000 use varying register numbers for hardware registers
with identical name and function.  I suppose that is due to historical
accident?

On the SH, it makes sense to consider the floating point register
start number as variable; however, there are a lot more register
numbers that are constant:
the privileged mode registers of the SH1..SH4 are not replicated
in the SH5; the SH5 has other registers of its own for privileged
mode.  All the sh-dsp specific register are, well, sh-dsp specific,
and hence only the sh-dsp numbering applies.
	
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