get_bp 52 arch/x86/include/asm/stacktrace.h #define get_bp(bp) asm("movl %%ebp, %0" : "=r" (bp) :) get_bp 55 arch/x86/include/asm/stacktrace.h #define get_bp(bp) asm("movq %%rbp, %0" : "=r" (bp) :)