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From: Alexei Starovoitov <alexei.starovoitov@gmail.com>
To: Jakub Kicinski <kubakici@wp.pl>
Cc: xdp-newbies@vger.kernel.org, yhs@fb.com
Subject: Re: BPF assembler?
Date: Wed, 30 Aug 2017 21:37:56 -0700	[thread overview]
Message-ID: <CAADnVQKuZSc3bzMSmsCZB1FLnmywOEhMECSu_yruCD+exq81Sw@mail.gmail.com> (raw)

On Wed, Aug 30, 2017 at 9:24 PM, Jakub Kicinski <kubakici@wp.pl> wrote:
>
>> llvm assembler is almost there too, but it needs some work.
>
> Does it use the "verifier instruction format"?  Is it available
> somewhere to look at?

yes. you can use verifier instruction format.
That was the goal for llvm to be as close as possible to
kernel verifier syntax.
But, I think, it's fine to deviate if it makes asm code easier to read.
What is missing is AsmParser directory in
llvm/lib/Target/BPF
disassembler, elf tools, codegen are all there.
Most of the core backend components are shared in the llvm,
so it's only missing text parser.
Most backends already have assemblers:
ls -d lib/Target/*/AsmParser
To make one for BPF requires a lot of copy-paste from others ;)

             reply	other threads:[~2017-08-31  4:38 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-08-31  4:37 Alexei Starovoitov [this message]
2017-08-31  5:32 ` BPF assembler? Y Song
2017-08-31 18:19   ` Zvi Effron
  -- strict thread matches above, loose matches on Subject: below --
2017-08-31  4:06 Jakub Kicinski
2017-08-31  4:14 ` Alexei Starovoitov
2017-08-31  4:24   ` Jakub Kicinski
2017-08-31  4:58   ` David Miller

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