From: Nick Clifton <nickc@redhat.com>
To: "Jose E. Marchesi" <jose.marchesi@oracle.com>,
Nick Clifton via Binutils <binutils@sourceware.org>
Subject: Re: Commit: Gas: Add .nop directive.
Date: Tue, 15 Sep 2020 12:13:06 +0100 [thread overview]
Message-ID: <66993ade-f84c-5f7a-86e8-a1dd017f38b5@redhat.com> (raw)
In-Reply-To: <87bli89y63.fsf@oracle.com>
Hi Jose,
> In the same spirit, it would be awesome to be able to generate
> architecture-neutral data directives as well, for DWARF and CTF and the
> like :)
What about ".dc.b <val>" ? Does that not work for all targets ?
>> +#define md_single_noop_insn "mov %r1,%r1"
>
> For BPF we have this in GCC:
>
> (define_insn "nop"
> [(const_int 0)]
> ""
> "mov\t%%r0,%%r0"
> I think it would be good to settle on the same way to encode nops in
> both GCC and binutils.
Actually David Faust just posted a patch to change the instruction to "ja 0"
as this is what the kernel expects. I have applied his patch to gas. Maybe
gcc should be updated as well ?
Cheers
Nick
next prev parent reply other threads:[~2020-09-15 11:13 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-14 15:13 Nick Clifton
2020-09-14 15:27 ` Jose E. Marchesi
2020-09-15 11:13 ` Nick Clifton [this message]
2020-09-15 11:57 ` Jose E. Marchesi
2020-09-14 15:38 ` Andreas Schwab
2020-09-14 16:02 ` Nick Clifton
2020-09-30 18:18 ` Maciej W. Rozycki
[not found] <mailman.151032.1600097231.8982.binutils@sourceware.org>
2020-09-14 16:04 ` Michael Morrell
2020-09-14 16:31 ` Nick Clifton
2020-09-15 9:53 ` Nick Clifton
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