[RFC] Add support for the Renesas rl78 architecture

[Joel Brobecker]

Hi Kevin,

> Comments?

FWIW, I took a quick look at the code, although I don't know anything
about this architecture. You took the time to comment it nicely,
I also appreciate that.

> gdb/ChangeLog:
> 
> 	* configure.tgt (rl78-*-elf): New target.
> 	* rl78-tdep.c: New file.
> 
> include/gdb/ChangeLog:
> 
> 	* sim-rl78.h: New file.

For the GDB bits, my only comments are with the coding style:
  - There should be an empty line between a function description
    and the start of its definition.
  - There should be an empty line after variable declarations
  - I noticed that you exceeded the 80 characters line size
    a few times
  - I think you want the opening curly brace on the next line
    at the same column as the previous one (not indented 2 characters):

> +/* Implement the "register_name" gdbarch method.  */
> +static const char *
> +rl78_register_name (struct gdbarch *gdbarch, int regnr)
> +{
> +  static const char *const reg_names[] = {
> +    "bank0_r0",

and

> +enum sim_rl78_regnum
> +  {
> +    sim_rl78_bank0_r0_regnum,
> +    sim_rl78_bank0_r1_regnum,
> +    sim_rl78_bank0_r2_regnum,

That's all I can really say.

-- 
Joel