Hi Jason,
At a certain point I should really come up with an ISA documentation to upload
on gem5.org
Anyway, those are magic operands defined in the operands file [1].
(More specifically [2] and [3]).
When the ISA parser detect those magic words, it translates them into an
appropriate action (generates some C++ code). For example
XDest is an integer destination register and the parser translates it into a
GPR read [4] in case of:
val = XDest
and in a GPR write [5] in case of
XDest = val
Let me know if this helps
Kind Regards
Giacomo
[1]: https://github.com/gem5/gem5/blob/stable/src/arch/arm/isa/operands.isa
[2]: https://github.com/gem5/gem5/blob/stable/src/arch/arm/isa/operands.isa#L685
[3}: https://github.com/gem5/gem5/blob/stable/src/arch/arm/isa/operands.isa#L194
[4]:
https://github.com/gem5/gem5/blob/stable/src/arch/isa_parser/operand_types.py#L199
[5]:
https://github.com/gem5/gem5/blob/stable/src/arch/isa_parser/operand_types.py#L216
> -Original Message-
> From: Jason Z via gem5-users
> Sent: 02 June 2021 19:09
> To: gem5-users@gem5.org
> Cc: Jason Z
> Subject: [gem5-users] Variable Definitions
>
> Hello Everyone,
>
> I am in the process of trying to add a new instruction, so I am trying to make
> sure I understand the code and the things that I need to change/utilize, but I
> was wondering if there was a better way to determine what each of the
> variables are referring to in gem5 as I haven't been able to find where they
> would be defined.
>
> For instance, in the file src/arch/arm/isa/insts/str64.isa, I am looking into
> the
> variables Mem_ud and XDest_ud to make sure I understand how a store
> works.
>
> I have been piecing together what I can based on the context and searching
> online, but I just wanted to make sure that I'm not going about it the hard
> way or if this is the correct approach by just considering the context they
> are
> used.
>
> Thank you for your time!
>
> Respectfully,
>
> Jason Z.
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