[OpenBIOS] make unoptimized sparc64 build usable with linux kernel

[Blue Swirl]

On 4/17/09, Igor Kovalenko <igor.v.kovalenko at gmail.com> wrote:
> Hi!
>
>  After doing some homework with sparc64-elf-gcc -O0 :) I made this
>  local change in sparc64-call-client.diff
>  It allocates larger stack frame so unoptimized code could save
>  arguments on stack, and then calls of_client_interface().
>  This at least allows me to use debugger with qemu and unoptimized
>  sparc64 openbios build.

Maybe the real solution is to implement context switching (context.c
switch_to()) so that we use the OpenBIOS stack instead of kernel
stack? Though flushing windows may be tricky.

The delay slot instructions should be preceded by one extra space.