aya: convert bpf programs to assembly

[Billy99]

In aya/src/sys/bpf.rs, there are several simple bpf programs written as byte arrays. Rework these as assembly code and then generate the bytecode.

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[alessandrod]

Hello!

I don't think we should do this, for two reasons:

• solana_rbpf implements SBPF - an eBPF dialect which is not compatible with kernel eBPF
• as it is, the patch assembles at runtime, which incurs in a performance cost. If we could fork the solana_rbpf assembler and make it work at compile time that'd be great, and something I've been (idly) thinking about.

[dave-tucker]

Hello!

I don't think we should do this, for two reasons:

• solana_rbpf implements SBPF - an eBPF dialect which is not compatible with kernel eBPF
• as it is, the patch assembles at runtime, which incurs in a performance cost. If we could fork the solana_rbpf assembler and make it work at compile time that'd be great, and something I've been (idly) thinking about.

The issue here is twofold:

1. Keeping little and big endian versions of the same programs around isn't nice
2. Hand-encoding the asm instructions into byte arrays is error prone

If the solana_rbpf assembler is a no-go, that's totally fine.
I can take a pass of doing something in macros a little like what libbpf does: https://github.com/libbpf/libbpf/blob/master/src/features.c#L51-L56

[alessandrod]

can take a pass of doing something in macros a little like what libbpf does:

something like this works, iirc there's an existing crate for it even

[dave-tucker]

can take a pass of doing something in macros a little like what libbpf does:

something like this works, iirc there's an existing crate for it even

oh cool! if you find it let me know.

[alessandrod]

can take a pass of doing something in macros a little like what libbpf does:

something like this works, iirc there's an existing crate for it even

oh cool! if you find it let me know.

it's not the one I saw a while ago but this seems ok https://github.com/arcjustin/bpf-ins

[mergify]

@Billy99, this pull request is now in conflict and requires a rebase.