[OpenBIOS] [PATCH 0/6] Allow read-only access to CPU context in Forth

Mark Cave-Ayland mark.cave-ayland at ilande.co.uk
Sun Oct 16 19:03:07 CEST 2016


On 08/10/16 11:56, Mark Cave-Ayland wrote:

> The motivation behind the previous context work was to enable access to the
> saved context in Forth, e.g. some SPARC64 bootloaders will attempt to read
> the saved register values.
> 
> This patch enables read-only access to the CPU registers in Forth for PPC,
> SPARC32 and SPARC64 whilst also implementing the IEEE-1275 .registers word.
> 
> NOTE: the primary reason this is read-only is because currently there exists
> no Forth CFA that can evaluate an xt and use the result as part of a
> "<value> to %g1" construction.
> 
> 
> Mark Cave-Ayland (6):
>   Make current CPU context available in Forth
>   libopenbios: don't display output on execution of "go" word
>   ppc: fix off-by-one error for register r4 in context switch
>   ppc: add basic read-only Forth register support
>   SPARC32: add basic read-only Forth register support
>   SPARC64: add basic read-only Forth register support
> 
>  arch/ppc/ppc.fs           |  127 +++++++++++++++++++++++-------------
>  arch/ppc/qemu/switch.S    |    2 +-
>  arch/sparc32/build.xml    |    1 +
>  arch/sparc32/cpu.fs       |  100 +++++++++++++++++++++++++++++
>  arch/sparc64/build.xml    |    1 +
>  arch/sparc64/cpu.fs       |  156 +++++++++++++++++++++++++++++++++++++++++++++
>  forth/debugging/client.fs |    6 ++
>  libopenbios/init.c        |    4 ++
>  libopenbios/initprogram.c |   16 +----
>  9 files changed, 354 insertions(+), 59 deletions(-)
>  create mode 100644 arch/sparc32/cpu.fs
>  create mode 100644 arch/sparc64/cpu.fs

No comments received on this, so I've pushed it to git master since I
have another couple of outstanding patchsets that build upon the work
done here.


ATB,

Mark.




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