Kconfig: add config for low-priority debug mon isr

Debug monitor needs to be configured to a low priority in order to be useful for debugging (to prioritize other interrupts when waiting on a breakpoint). Added a config that configures the interrupt this way. Signed-off-by: Piotr Jasiński <[email protected]>
jmyllyla · Dec 28, 2022 · 7fa0af0 · 7fa0af0
1 parent 1fe4b1e
commit 7fa0af0
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Showing 2 changed files with 10 additions and 2 deletions.
diff --git a/arch/arm/core/aarch32/cortex_m/Kconfig b/arch/arm/core/aarch32/cortex_m/Kconfig
@@ -352,7 +352,13 @@ config CORTEX_M_DWT
 	  Enable and use the Data Watchpoint and Trace (DWT) unit for
 	  timing functions.
 
-# Additional stack for tests when building with FPU_SHARING
+config CORTEX_M_DEBUG_MONITOR_HOOK
+	bool "Debug monitor interrupt for debugging"
+	depends on !ARMV6_M_ARMV8_M_BASELINE
+	help
+	  Enable this option to configure debug monitor exception to low priority
+	  for debugging purposes.
+
 # enabled, which may increase ESF stacking requirements for
 # threads.
 config TEST_EXTRA_STACK_SIZE

diff --git a/arch/arm/include/aarch32/cortex_m/exc.h b/arch/arm/include/aarch32/cortex_m/exc.h
@@ -112,7 +112,9 @@ static ALWAYS_INLINE void z_arm_exc_setup(void)
 	NVIC_SetPriority(MemoryManagement_IRQn, _EXC_FAULT_PRIO);
 	NVIC_SetPriority(BusFault_IRQn, _EXC_FAULT_PRIO);
 	NVIC_SetPriority(UsageFault_IRQn, _EXC_FAULT_PRIO);
-#if defined(CONFIG_CPU_CORTEX_M_HAS_DWT)
+#if defined(CONFIG_CORTEX_M_DEBUG_MONITOR_HOOK)
+	NVIC_SetPriority(DebugMonitor_IRQn, IRQ_PRIO_LOWEST);
+#elif defined(CONFIG_CPU_CORTEX_M_HAS_DWT)
 	NVIC_SetPriority(DebugMonitor_IRQn, _EXC_FAULT_PRIO);
 #endif
 #if defined(CONFIG_ARM_SECURE_FIRMWARE)