[nrf fromlist] arch: riscv: added helper config to include isr wrapper

Added helper Kcoinfig option USE_ISR_WRAPPER which can be used to
include isr_wrapper even if GEN_SW_ISR_TABLE is not enabled. This
is needed to enable configurations where only IRQ vector table is
used with multithreading (only direct isr used). This change is
backward compatibible with previous config.

Upstream PR #: 94655

Signed-off-by: Łukasz Stępnicki <[email protected]>
Signed-off-by: Rafal Dyla <[email protected]>

Author: lstnl

arch/riscv/Kconfig

@@ -262,6 +262,15 @@ config RISCV_GENERIC_TOOLCHAIN
 	  Allow SOCs that have custom extended riscv ISA to still
 	  compile with generic riscv32 toolchain.
 
+config USE_ISR_WRAPPER
+	bool "Use isr_wrapper to handle interrupt and/or exception/fault"
+	default y if GEN_SW_ISR_TABLE
+	default y if MULTITHREADING
+	help
+	  This is helper config to be able to use exception handling
+	  when GEN_SW_ISR_TABLE is not used but multithreading is, which
+	  needs exception handling and thread entry/switch functions.
+
 config GEN_ISR_TABLES
 	default y