linux-kernel - Re: [PATCH v2 bpf-next 01/13] bpf: x86: Factor out emission of ModR/M for *(reg + off)

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Date:   Tue, 1 Dec 2020 21:50:00 -0800
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Brendan Jackman <jackmanb@...gle.com>
Cc:     bpf <bpf@...r.kernel.org>, Alexei Starovoitov <ast@...nel.org>,
        Yonghong Song <yhs@...com>,
        Daniel Borkmann <daniel@...earbox.net>,
        KP Singh <kpsingh@...omium.org>,
        Florent Revest <revest@...omium.org>,
        LKML <linux-kernel@...r.kernel.org>, Jann Horn <jannh@...gle.com>
Subject: Re: [PATCH v2 bpf-next 01/13] bpf: x86: Factor out emission of ModR/M
 for *(reg + off)

On Tue, Dec 1, 2020 at 4:14 AM Brendan Jackman <jackmanb@...gle.com> wrote:
>
> On Sat, Nov 28, 2020 at 05:15:52PM -0800, Alexei Starovoitov wrote:
> > On Fri, Nov 27, 2020 at 05:57:26PM +0000, Brendan Jackman wrote:
> > > +/* Emit the ModR/M byte for addressing *(r1 + off) and r2 */
> > > +static void emit_modrm_dstoff(u8 **pprog, u32 r1, u32 r2, int off)
> >
> > same concern as in the another patch. If you could avoid intel's puzzling names
> > like above it will make reviewing the patch easier.
>
> In this case there is actually a call like
>
>   emit_modrm_dstoff(&prog, src_reg, dst_reg)

emit_insn_prefix() ?