netdev - Re: arch: arm: bpf: Converting cBPF to eBPF for arm 32 bit

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Message-Id: <20170315.145512.1542025976162251828.davem@davemloft.net>
Date:   Wed, 15 Mar 2017 14:55:12 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     illusionist.neo@...il.com
Cc:     keescook@...omium.org, daniel@...earbox.net, mgherzan@...il.com,
        netdev@...r.kernel.org, kernel-hardening@...ts.openwall.com,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: arch: arm: bpf: Converting cBPF to eBPF for arm 32 bit

From: Shubham Bansal <illusionist.neo@...il.com>
Date: Wed, 15 Mar 2017 17:43:44 +0530

>> You can't truncate, but you'll have to build 64-bit ops using 32-bit registers.
> 
> A small example would help a lot.

You can simply perform 64-bit operations in C code and see what gcc
outputs for that code on this 32-bit target.