Aiden Leong

Kernel Call Graph

编译内核

修改内核源码根目录的Makefile文件

给KBUILD_CFLAGS增加一个-fdump-rtl-expand参数

KBUILD_CFLAGS :=
KBUILD_CFLAGS += -fdump-rtl-expand
KBUILD_CFLAGS += -std=gnu11
KBUILD_CFLAGS += -fshort-wchar
KBUILD_CFLAGS += -funsigned-char
KBUILD_CFLAGS += -fno-common
KBUILD_CFLAGS += -fno-PIE
KBUILD_CFLAGS += -fno-strict-aliasing

编译后产物，除了.o文件还会有.expand文件

获取函数调用关系

egypt $(find . -name '*.expand' -print) > egypt_output.dot