xtensa: Define COMMON_CTX_REGS for chips without FPU (e.g. ESP32-S2)
# define RESERVE_REGS 8
# define XCPTCONTEXT_REGS (COMMON_CTX_REGS + COPROC_CTX_REGS + RESERVE_REGS)
#else
+# define COMMON_CTX_REGS _REG_CP_START
# define RESERVE_REGS 8
-# define XCPTCONTEXT_REGS (_REG_CP_START + RESERVE_REGS)
+# define XCPTCONTEXT_REGS (COMMON_CTX_REGS + RESERVE_REGS)
#endif
#define XCPTCONTEXT_SIZE (4 * XCPTCONTEXT_REGS)
