Linux Device Driver

解決"unknown relocation: 10"問題


問題如下:

# insmod test.ko 
[    7.175590] hello: unknown relocation: 10
[    7.206189] hello: unknown relocation: 10
insmod: can't insert 'test.ko': invalid module format

定位到位置在arch/arm/kernel/module.c

    default:
      pr_err("%s: unknown relocation: %u\n",
             module->name, ELF32_R_TYPE(rel->r_info));
      return -ENOEXEC;
    }
  }
  return 0;
}

定義值如下:

#define R_ARM_THM_CALL 10

往回找一下,發現在同一段

#ifdef CONFIG_THUMB2_KERNEL
  case R_ARM_THM_CALL:
  case R_ARM_THM_JUMP24:

THUMB2沒有被Enable

Enable後,再度編譯Kernel,出現很多編譯問題...

最後,司徒發現原來是export造成的問題,原本的export如下:

export ARCH=arm
export CROSS=arm-linux-gnueabihf-
export CC=${CROSS}gcc
export LD=${CROSS}ld
export AS=${CROSS}as
export CXX=${CROSS}g++

改成如下即可

export ARCH=arm
export CROSS_COMPILE=arm-linux-gnueabihf-


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