[Libre-soc-bugs] [Bug 849] New: binutils: parse macros in SVP64 and refactor code

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=849

            Bug ID: 849
           Summary: binutils: parse macros in SVP64 and refactor code
           Product: Libre-SOC's first SoC
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: CONFIRMED
          Severity: enhancement
          Priority: ---
         Component: Source Code
          Assignee: ghostmansd at gmail.com
          Reporter: ghostmansd at gmail.com
                CC: libre-soc-bugs at lists.libre-soc.org
   NLnet milestone: NLNet.2019.10.Formal
 total budget (EUR) 1300
  for completion of
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   budget (EUR) for 1300
         this task,
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  subtasks' budget:
    parent task for 550
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The current binutils implementation acts in a way similar to pysvp64asm. This,
however, has a huge limitation: we parse operands on our own, and this somewhat
duplicates an existing ecosystem. Since we don't use the vanilla code, we also
lack support for some its features, like macro substitution.

Ideally we should refactor the ppc_assemble (originally md_assemble) in a way
so that it deals with SVP instructions directly. This would, in turn, inflict
some changes to lexer. The vanilla binutils code is not ready for even dealing
with SVP64 operands, since the way we treat the operand depend on operation
modes, and binutils don't even have way to pass this context (other than via
global variable, which is bad, since we deal on per-instruction basis).

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