[Bug tdep/26613] New: Arm: Secure stack not supported

["alahay01 at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=26613

            Bug ID: 26613
           Summary: Arm: Secure stack not supported
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: tdep
          Assignee: unassigned at sourceware dot org
          Reporter: alahay01 at gcc dot gnu.org
  Target Milestone: ---

On cortex M, the exception stack can use a secure stack.

This is not currently supported.

See this comment in arm-tdep.c arm_m_exception_cache()

      /* ARMv8-M Exception and interrupt handling is not considered here.
         In the ARMv8-M architecture also EXC_RETURN bit S is controlling if
         the Secure or Non-secure stack was used. To separate Secure and
         Non-secure stacks, processors that are based on the ARMv8-M
         architecture support 4 stack pointers: MSP_S, PSP_S, MSP_NS, PSP_NS.
         In addition, a stack limit feature is provided using stack limit
         registers (accessible using MSR and MRS instructions) in Privileged
         level.  */

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