PT_USER_SIZE      113 arch/xtensa/include/asm/ptrace.h #define PT_REGS_OFFSET	  (KERNEL_STACK_SIZE - PT_USER_SIZE)
PT_USER_SIZE       68 arch/xtensa/kernel/asm-offsets.c 	DEFINE(PT_USER_SIZE, offsetof(struct pt_regs, areg[XCHAL_NUM_AREGS]));