[OpenBIOS] r638 - in trunk/openbios-devel/forth: bootstrap device

[Nick Couchman]

>>> On 2009/12/03 at 08:47, <svn at openbios.org> wrote:
> Author: mcayland
> Date: 2009-12-03 16:47:39 +0100 (Thu, 03 Dec 2009)
> New Revision: 638
> 
> Modified:
>    trunk/openbios-devel/forth/bootstrap/bootstrap.fs
>    trunk/openbios-devel/forth/device/fcode.fs
> Log:
> Fix backwards Fcode branches (bbranch and b?branch). 
> 
> According to the specification, the destination for a backwards Fcode branch 
> must be resolved from the bottom rather than the 
> top of the cstack. The existing version of the code was simply doing a swap, 
> and so nesting any branches within a backward branch 
> would fail since the wrong destination would be resolved from the stack.
> 
> This patch adds a new cstack-startdepth variable to keep track of the cstack 
> base location within an execution context 
> (setup-tmp-comp and execute-tmp-comp) and alters the backward branches to make 
> use of it.
> 
> With this patch in place, Milax under Qemu doesn't crash anymore but sits in 
> an infinite loop reading sectors from the CDROM.
> 
> 

The Solaris Nevada code still gets the unhandled exception in cfetch.

-Nick



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