RL78 sim?

[DJ Delorie]

> So far I've been testing with hardware but I'm pretty sure I read 
> somewhere about an RL78 simulator, which would be a useful addition. 
> Does this simulator exist, and if so, how do I run the tests against it?

The simulator is part of the GDB build.

> I tried 'make -k check RUNTESTFLAGS="--target_board=rl78-sim"' but in 
> amongst the errors I see 'ERROR: couldn't load description file for 
> rl78-sim', either it has a different name or I'm missing something on my 
> system (and a quick search didn't seem to find anything but I don't 
> really know what I'm looking for).

You'll need something like this in your local ${DEJAGNU} file:

    { "rl78*-*" } {
	set boards_dir "/home/dj/dejagnu/baseboards"
	set target_list { rl78-sim }
    }

Here's my rl78-sim.exp for dejagnu (it goes in whatever directory you
specified above):

# This is a list of toolchains that are supported on this board.
set_board_info target_install {rl78-elf}

# Load the generic configuration for this board. This will define a basic set
# of routines needed by the tool to communicate with the board.
load_generic_config "sim"

# basic-sim.exp is a basic description for the standard Cygnus simulator.
load_base_board_description "basic-sim"

# "rl78" is the name of the sim subdir.
setup_sim rl78

# No multilib options needed by default.
process_multilib_options ""

# We only support newlib on this target. We assume that all multilib
# options have been specified before we get here.

set_board_info compiler  "[find_gcc]"
set_board_info cflags    "[libgloss_include_flags] [newlib_include_flags] -msim"
set_board_info ldflags   "[libgloss_link_flags] [newlib_link_flags]"

# Doesn't pass arguments or signals, can't return results, and doesn't
# do inferiorio.
set_board_info noargs 1
set_board_info gdb,nosignals 1
set_board_info gdb,noresults 1
set_board_info gdb,noinferiorio 1

# Limit the stack size to something real tiny.
set_board_info gcc,stack_size 4096

set_board_info gcc,timeout 300