[Qemu-arm] [PATCH v2 19/26] armv7m: mpu not allowed to map exception return codes

[Michael Davidsaver]

Always pass these through to be caught be by the
unassigned handler.
---
 target-arm/helper.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/target-arm/helper.c b/target-arm/helper.c
index e42f6d0..a5adf2d 100644
--- a/target-arm/helper.c
+++ b/target-arm/helper.c
@@ -7106,6 +7106,15 @@ static bool get_phys_addr_pmsav7(CPUARMState *env, 
uint32_t address,
     *phys_ptr = address;
     *prot = 0;
 
+    /* Magic exception codes returns always pass through the MPU
+     * to be trapped later in arm_v7m_unassigned_access()
+     */
+    if (IS_M(env) && env->v7m.exception != 0 && address >= 0xfffffff0) {
+        *prot = PAGE_EXEC;
+        *fsr = 0;
+        return false;
+    }
+
     if (regime_translation_disabled(env, mmu_idx)) { /* MPU disabled */
         get_phys_addr_pmsav7_default(env, mmu_idx, address, prot);
     } else { /* MPU enabled */
-- 
2.1.4