From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <sourceware-bugzilla@sourceware.org>
Received: by sourceware.org (Postfix, from userid 48)
 id 88FF33858036; Mon, 13 Dec 2021 22:00:38 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 88FF33858036
From: "fredrik.hederstierna@securitas-direct.com"
 <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug gdb/28549] ARM/Cortex-M: improper stack unwinding when the
 target is in lockup state
Date: Mon, 13 Dec 2021 22:00:38 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gdb
X-Bugzilla-Component: gdb
X-Bugzilla-Version: 9.2
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: fredrik.hederstierna@securitas-direct.com
X-Bugzilla-Status: WAITING
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P2
X-Bugzilla-Assigned-To: luis.machado at linaro dot org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-28549-4717-b33qcP68pX@http.sourceware.org/bugzilla/>
In-Reply-To: <bug-28549-4717@http.sourceware.org/bugzilla/>
References: <bug-28549-4717@http.sourceware.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: http://sourceware.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
X-BeenThere: gdb-prs@sourceware.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Gdb-prs mailing list <gdb-prs.sourceware.org>
List-Unsubscribe: <https://sourceware.org/mailman/options/gdb-prs>,
 <mailto:gdb-prs-request@sourceware.org?subject=unsubscribe>
List-Archive: <https://sourceware.org/pipermail/gdb-prs/>
List-Help: <mailto:gdb-prs-request@sourceware.org?subject=help>
List-Subscribe: <https://sourceware.org/mailman/listinfo/gdb-prs>,
 <mailto:gdb-prs-request@sourceware.org?subject=subscribe>
X-List-Received-Date: Mon, 13 Dec 2021 22:00:38 -0000

https://sourceware.org/bugzilla/show_bug.cgi?id=3D28549

--- Comment #22 from Fredrik Hederstierna <fredrik.hederstierna@securitas-d=
irect.com> ---
Something like this (sketch not compiled):

@@ -2982,6 +2989,7 @@ arm_m_exception_cache (struct frame_info *this_frame)
   struct gdbarch *gdbarch =3D get_frame_arch (this_frame);
   enum bfd_endian byte_order =3D gdbarch_byte_order (gdbarch);
   struct arm_prologue_cache *cache;
+  CORE_ADDR pc;
   CORE_ADDR lr;
   CORE_ADDR sp;
   CORE_ADDR unwound_sp;
@@ -2998,12 +3006,26 @@ arm_m_exception_cache (struct frame_info *this_fram=
e)
      describes which bits in LR that define which stack was used prior
      to the exception and if FPU is used (causing extended stack frame).  =
*/

+  pc =3D get_frame_register_unsigned (this_frame, ARM_PC_REGNUM);
   lr =3D get_frame_register_unsigned (this_frame, ARM_LR_REGNUM);
   sp =3D get_frame_register_unsigned (this_frame, ARM_SP_REGNUM);

   /* Check EXC_RETURN indicator bits.  */
   exc_return =3D (((lr >> 28) & 0xf) =3D=3D 0xf);

+  /* Check if the core is in Lockup state.  */
+  if (exc_return && (pc =3D=3D 0xFFFFFFFE))
+    {
+      /* Thread (process) stack could not be fetched in Lockup,
+        give warning and exit.  */
+
+      warning (_("no thread stack unwinding supported in Lockup."));
+
+      /* Terminate any further stack unwinding by refer to self.  */
+      cache->prev_sp =3D sp;
+      return cache;
+    }
+
   /* Check EXC_RETURN bit SPSEL if Main or Thread (process) stack used.  */
   process_stack_used =3D ((lr & (1 << 2)) !=3D 0);
   if (exc_return && process_stack_used)

--=20
You are receiving this mail because:
You are on the CC list for the bug.=