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From: "tomas.vanek at fbl dot cz" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug tdep/29716] Arm v8 M-profile FNC_RETURN unwinder uses wrong
 stack
Date: Fri, 04 Nov 2022 18:24:15 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29716

--- Comment #5 from tomas.vanek at fbl dot cz ---
My modifications to ST GTZC_TZSC_MPCBB_TrustZone example to exercise FNC_RE=
TURN
and return from secure to non-secure (LED3 indicates secure mode):

Secure/main.c:
  void SECURE_Mode(funcptr back_ns);
  void NSCalledFromSec(void);
  void NSCalledFromNS(void);
  void SecCalledFromNS(void);

  static void SecCalledFromSec(funcptr back_ns)
  {
        if (back_ns) {
                back_ns();
        }
  }

  CMSE_NS_ENTRY void SECURE_Mode(funcptr back_ns)
  {
        HAL_GPIO_WritePin(LED3_GPIO_Port, LED3_Pin, 1);

        SecCalledFromSec(back_ns);
  }

  CMSE_NS_ENTRY void SecCalledFromNS(void)
  {
        HAL_GPIO_WritePin(LED3_GPIO_Port, LED3_Pin, 1);
  }

NonSecure/main.c:

  void NSCalledFromNS(void)
  {
        SecCalledFromNS();
        HAL_GPIO_WritePin(LED3_GPIO_Port, LED3_Pin, 0);
  }

  void NSCalledFromSec(void)
  {
        HAL_GPIO_WritePin(LED3_GPIO_Port, LED3_Pin, 0);
        NSCalledFromNS();
  }

  int main(void)
  {
...
add to while loop:
        SECURE_Mode(&NSCalledFromSec);
        HAL_GPIO_WritePin(LED3_GPIO_Port, LED3_Pin, 0);

--=20
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