Hi all,
as part of my diploma thesis I want to implement an interface for
custom instructions for the RISC-V ISA.
The goal is to have a mechanism (plug-in, ...) where a user can easily
add an instruction, define its opcode and its behaviour without
touching the decoder.
As changing the underlying decoder results in recompiling and
rebuilding of almost the whole binary, I think it might be better to
define entry points in the decoder that give control to a decoding
function within a plug-in.
This way the decoder doesn't need to be touched, when a new
instruction is added.
A first idea, that comes to my mind, is to describe the behaviour and
opcodes in a C++ file. From all existing descriptions a custom decoder
is generated, that takes over decoding, once the gem5 decoder reaches
the entry point for custom instructions.
Do you see any problem with this approach? Is there a better way to
implement such an interface?
Kind regards
Robert
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