Hi Kyrill
On 12/03/2019 12:03, Kyrill Tkachov wrote:
> Hi Sudi,
>
> On 2/22/19 10:45 AM, Sudakshina Das wrote:
>> Hi
>>
>> This patch documents the addition of the new Armv8.5-A and corresponding
>> extensions in the gcc-9/changes.html.
>> As per https://gcc.gnu.org/about.html, I have used W3 Validator.
>> Is this ok for cvs?
>>
>> Thanks
>> Sudi
>
>
> Index: htdocs/gcc-9/changes.html
> ===================================================================
> RCS file: /cvs/gcc/wwwdocs/htdocs/gcc-9/changes.html,v
> retrieving revision 1.43
> diff -u -r1.43 changes.html
> --- htdocs/gcc-9/changes.html 21 Feb 2019 10:32:55 -0000 1.43
> +++ htdocs/gcc-9/changes.html 21 Feb 2019 18:25:09 -0000
> @@ -283,6 +283,19 @@
> </p>
> <p>The intrinsics are defined by the ACLE specification.</p>
> </li>
> + <li>
> + The Armv8.5-A architecture is now supported. This can be used by
> specifying the
> + <code>-march=armv8.5-a</code> option.
>
>
> I tend to prefer the wording "... is now supported through the
> <code>-march=armv8.5-a</code> option".
> Otherwise it reads as the compiler "using" the architecture, whereas we
> usually talk about "targeting" an architecture.
>
> + </li>
> + <li> The Armv8.5-A architecture also adds some security features that
> are optional to all older
> + architecture versions. These are also supported now and only effect
> the assembler.
> + <ul>
> + <li> Speculation Barrier instruction using
> <code>-march=armv8-a+sb</code>.</li>
> + <li> Execution and Data Prediction Restriction instructions using
> <code>-march=armv8-a+predres</code>.</li>
> + <li> Speculative Store Bypass Safe instruction using
> <code>-march=armv8-a+ssbs</code>. This does not
> + require a compiler option for Arm and thus
> <code>-march=armv8-a+ssbs</code> is a AArch64 specific option.</li>
>
> "AArch64-specific"
>
>
> LGTM otherwise.
> Thanks,
> Kyrill
Thanks for the review and sorry for the delay in response. I had edited
the language for adding new options in a few other places as well.
Thanks
Sudi
>
> + </ul>
> + </li>
> </ul>
>
> <h5 id="aarch64">AArch64 specific</h5>
> @@ -298,6 +311,22 @@
> The default value is 16 (64Kb) and can be changed at configure
> time using the flag
> <code>--with-stack-clash-protection-guard-size=12|16</code>.
> </li>
> + <li>
> + The option <code>-msign-return-address=</code> has been deprecated.
> This has been replaced
> + by the new <code>-mbranch-protection=</code> option. This new
> option can now be used to
> + enable the return address signing as well as the new Branch Target
> Identification
> + feature of Armv8.5-A architecture. For more information on the
> arguments accepted by
> + this option, please refer to
> + <a
> href="https://gcc.gnu.org/onlinedocs/gcc/AArch64-Options.html#AArch64-Options";>
>
>
> + AArch64-Options</a>.
> + </li>
> + <li> The following optional extensions to Armv8.5-A architecture are
> also supported now and
> + only effect the assembler.
> + <ul>
> + <li> Random Number Generation instructions using
> <code>-march=armv8.5-a+rng</code>.</li>
> + <li> Memory Tagging Extension using
> <code>-march=armv8.5-a+memtag</code>.</li>
> + </ul>
> + </li>
> </ul>
>
> <h5 id="arm">Arm specific</h5>
>
Index: htdocs/gcc-9/changes.html
===================================================================
RCS file: /cvs/gcc/wwwdocs/htdocs/gcc-9/changes.html,v
retrieving revision 1.52
diff -u -r1.52 changes.html
--- htdocs/gcc-9/changes.html 7 Mar 2019 14:40:06 -0000 1.52
+++ htdocs/gcc-9/changes.html 18 Mar 2019 18:55:24 -0000
@@ -342,6 +342,24 @@
</p>
<p>The intrinsics are defined by the ACLE specification.</p>
</li>
+ <li>
+ The Armv8.5-A architecture is now supported through the
+ <code>-march=armv8.5-a</code> option.
+ </li>
+ <li> The Armv8.5-A architecture also adds some security features that are
+ optional to all older architecture versions. These are also supported now
+ and only effect the assembler.
+ <ul>
+ <li> Speculation Barrier instruction through the
+ <code>-march=armv8-a+sb</code> option.</li>
+ <li> Execution and Data Prediction Restriction instructions through
+ the <code>-march=armv8-a+predres</code> option.</li>
+ <li> Speculative Store Bypass Safe instruction through the
+ <code>-march=armv8-a+ssbs</code> option. This does not require a
+ compiler option for Arm and thus <code>-march=armv8-a+ssbs</code>
+ is an AArch64-specific option.</li>
+ </ul>
+ </li>
</ul>
<h5 id="aarch64">AArch64 specific</h5>
@@ -362,6 +380,23 @@
The default value is 16 (64Kb) and can be changed at configure
time using the flag <code>--with-stack-clash-protection-guard-size=12|16</code>.
</li>
+ <li>
+ The option <code>-msign-return-address=</code> has been deprecated. This
+ has been replaced by the new <code>-mbranch-protection=</code> option. This
+ new option can now be used to enable the return address signing as well as
+ the new Branch Target Identification feature of Armv8.5-A architecture. For
+ more information on the arguments accepted by this option, please refer to
+ <a href="https://gcc.gnu.org/onlinedocs/gcc/AArch64-Options.html#AArch64-Options";>AArch64-Options</a>.
+ </li>
+ <li> The following optional extensions to Armv8.5-A architecture are also
+ supported now and only effect the assembler.
+ <ul>
+ <li> Random Number Generation instructions through the
+ <code>-march=armv8.5-a+rng</code> option.</li>
+ <li> Memory Tagging Extension through the
+ <code>-march=armv8.5-a+memtag</code> option.</li>
+ </ul>
+ </li>
</ul>
<h5 id="arm">Arm specific</h5>
