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 A7AD53AF599D; Wed,  5 Jun 2024 15:11:56 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org A7AD53AF599D
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1717600316;
	bh=0W9Cfs2QGFNUrPdqNCAo83cAC3/wVB6TTLbvpN+R9Kk=;
	h=From:To:Subject:Date:From;
	b=hQXmMuCBXZIhg3y2Wb1fntgRTBGw7HxzS9kIhxa7Tn0q7uSxYAu8ml4k3pydc0HX7
	 N99l16JF4pj4ehueNAqoDoDE4eyNNNLJRm5iyIqZmWlwvKF4bFBhXvhtP9v/gYlSmy
	 UsNFcfQ9AWexQWNMfPX67trmmvFelVqWI0TV3LOA=
From: "avieira at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/115360] New: cmse_nonsecure_call wrapper missing
 STT_FUNCTION
Date: Wed, 05 Jun 2024 15:11:56 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: target
X-Bugzilla-Version: 14.0
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: avieira at gcc dot gnu.org
X-Bugzilla-Status: UNCONFIRMED
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: bug_id short_desc product version bug_status
 bug_severity priority component assigned_to reporter target_milestone
Message-ID: <bug-115360-4@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
List-Id: <gcc-bugs.sourceware.org>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D115360

            Bug ID: 115360
           Summary: cmse_nonsecure_call wrapper missing STT_FUNCTION
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: avieira at gcc dot gnu.org
  Target Milestone: ---

The Arm ABI requires a linker to handle calls to 'distant' functions by
inserting a wrapper veneer, or trampoline.  Such functions need to be given
permission to do this by marking them as type STT_FUNC (so that it is clear
that there is a scratch register available for use within the veneer).=20
Unfortunately, __gnu_cmse_nonesecure_call is not marked at all (defaulting =
to
STT_NOTYPE).  A separate bug in GNU ld means this problem is not diagnosed =
at
link time, and the linker silently picks the wrong veneer type into the
bargain, leading to run-time crashes when the CPU is asked to switch into A=
rm
state on a thumb-only processor.=