From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugzilla@gcc.gnu.org>
Received: by sourceware.org (Postfix, from userid 48)
 id BE50B3857C61; Sat, 11 Jul 2020 21:40:51 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org BE50B3857C61
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
 s=default; t=1594503651;
 bh=uOsO+xVEE427lJpjCr5Y+Z/Ih5cG1CQz8iXk0C5v9LI=;
 h=From:To:Subject:Date:In-Reply-To:References:From;
 b=FeN1S+g/UsoH5xEU5bBdQh/j/CIvUcrMIXyAxe14Ay34CmVD5GpN/evafSwvRbVdm
 k2gMjVAWBEE10be6W0egOy/DhQPLl78f5kIuxu+FxUAuA6rTpj8ygBVoaKbcuw+yzr
 q4S9JCNZycDI9HjQ7T/HRr2tlZJx30yay8fOYgIA=
From: "gcczilla at cpellegrino dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/96168] GCC support for Apple Silicon (Arm64) on macOS
 requested
Date: Sat, 11 Jul 2020 21:40:51 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: target
X-Bugzilla-Version: 11.0
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: enhancement
X-Bugzilla-Who: gcczilla at cpellegrino dot de
X-Bugzilla-Status: SUSPENDED
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-96168-4-D4J4MKiIoA@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-96168-4@http.gcc.gnu.org/bugzilla/>
References: <bug-96168-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
X-BeenThere: gcc-bugs@gcc.gnu.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Gcc-bugs mailing list <gcc-bugs.gcc.gnu.org>
List-Unsubscribe: <http://gcc.gnu.org/mailman/options/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=unsubscribe>
List-Archive: <https://gcc.gnu.org/pipermail/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-request@gcc.gnu.org?subject=help>
List-Subscribe: <http://gcc.gnu.org/mailman/listinfo/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=subscribe>
X-List-Received-Date: Sat, 11 Jul 2020 21:40:51 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96168

--- Comment #7 from Claudia Pellegrino <gcczilla at cpellegrino dot de> ---
Thanks Eric, and thank you Iain for the ballpark estimate.

Just to add a piece of data to get a better idea of the work involved, here=
=E2=80=99s a
link to a document published by Apple. It specifies how their ABI differs f=
rom
the standard ARM64 one:
https://developer.apple.com/library/archive/documentation/Xcode/Conceptual/=
iPhoneOSABIReference/Articles/ARM64FunctionCallingConventions.html

Note that the document says iPhone OS but after a few cursory checks, the A=
BI
of macOS 11 on Apple Silicon seems entirely identical to the iOS one =E2=80=
=93 which
makes sense, given the SoCs are the same and their kernels and large parts =
of
either OS are known to be built from the same source.

To give proper credit: I didn=E2=80=99t do those quick checks myself but ma=
cOS/iOS
security researcher Saagar Jha did, who is cc=E2=80=99ed on this bug and kn=
ows a ton
more about Apple=E2=80=99s OSes than I do.=