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Date: Wed, 2 Feb 2022 07:59:13 +0100 (CET)
From: Richard Biener <rguenther@suse.de>
To: "H.J. Lu" <hjl.tools@gmail.com>
cc: gcc-patches@gcc.gnu.org
Subject: Re: [PATCH] gcc-12: Mention -mharden-sls= and
 -mindirect-branch-cs-prefix
In-Reply-To: <20220201165733.2705733-1-hjl.tools@gmail.com>
Message-ID: <o318n24p-8qop-pq35-rr4n-8299774propo@fhfr.qr>
References: <20220201165733.2705733-1-hjl.tools@gmail.com>
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On Tue, 1 Feb 2022, H.J. Lu wrote:


LGTM.

> ---
>  htdocs/gcc-12/changes.html | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/htdocs/gcc-12/changes.html b/htdocs/gcc-12/changes.html
> index 2719b9d5..479bd6c5 100644
> --- a/htdocs/gcc-12/changes.html
> +++ b/htdocs/gcc-12/changes.html
> @@ -387,6 +387,12 @@ a work-in-progress.</p>
>        x86 systems with SSE2 enabled. Without <code>{-mavx512fp16}</code>,
>        all operations will be emulated in software and <code>float</code>
>        instructions.
> +  <li>Mitigation against straight line speculation (SLS) for function
> +      return and indirect jump is supported via
> +      <code>-mharden-sls=[none|all|return|indirect-jmp]</code>.
> +  </li>
> +  <li>Add CS prefix to call and jmp to indirect thunk with branch target
> +      in r8-r15 registers via <code>-mindirect-branch-cs-prefix</code>.
>    </li>
>  </ul>
>