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From: "fredrik.hederstierna@securitas-direct.com"
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Subject: [Bug gdb/28549] ARM/Cortex-M: improper stack unwinding when the
 target is in lockup state
Date: Fri, 05 Nov 2021 23:25:26 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D28549

--- Comment #7 from Fredrik Hederstierna <fredrik.hederstierna@securitas-di=
rect.com> ---
This might started with patch from 2016-09-27:

@@ -472,7 +528,7 @@ arm_addr_bits_remove (struct gdbarch *gdbarch, CORE_ADDR
val)
   /* On M-profile devices, do not strip the low bit from EXC_RETURN
      (the magic exception return address).  */
   if (gdbarch_tdep (gdbarch)->is_m
-      && (val & 0xfffffff0) =3D=3D 0xfffffff0)
+      && arm_m_addr_is_magic (val))
     return val;

   if (arm_apcs_32)

Though still PC=3D0xEFFFFFFE is a Lockup state for ARMv8M to my understandi=
ng, so
just revert that wont do the full trick. Also I think it is good to have the
explicit EXC_RETURN values defined to possibly make way to future special
handling of the actual meaning of these values, like using different stack
pointers etc.

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