XCHAL_NUM_AREGS    69 include/asm-xtensa/processor.h #define WSBITS  (XCHAL_NUM_AREGS / 4)      /* width of WINDOWSTART in bits */
XCHAL_NUM_AREGS   117 include/asm-xtensa/ptrace.h   (task_stack_page(tsk) + KERNEL_STACK_SIZE - (XCHAL_NUM_AREGS-16)*4) - 1)