Fwd: GDB Stub with ARM BE8 target.

[Jon Wilson <jonwilson030981@googlemail.com>]

I am trying to integrate a GDB stub with a ARM BE8 target. However, it 
would appear that using "set endian big" defaults to BE32 architecture. 
I cannot seem to find a way to have the debugger interpret memory 
according to the BE8 architecture. The only support for BE8 mode I can 
see seems to be for when using BE8 core dumps or processes 
(https://github.com/bminor/binutils-gdb/blob/9606310bbbf8a2d529b5c2aa71cac48a46f65869/gdb/arm-tdep.c#L9781). 
I can't seem to find any documentation on the topic (which is pretty 
forgivable given how niche it is).

I looked at handling the endianness in the stub itself (e.g. inverting 
the endianness of memory based on permissions), but given the code 
stream can contain both instructions (which should be little endian in 
BE8) as well as data (which should be interpretted as big endian), this 
is not possible.

Have I missed an option somewhere? If this support is missing, then how 
should it be added? Should it be handled in a similar way to how GDB 
handles ARM versus Thumb mode? 
(https://github.com/bminor/binutils-gdb/blob/9606310bbbf8a2d529b5c2aa71cac48a46f65869/gdb/arm-tdep.c#L10589)?

I'd be very grateful for any advice.

Kind Regards.


Jon