[内核补丁] 解决2.6.29内核上加载模块出现"unknown relocation: 40"
我使用s3c2410+linux2.6.25.20+arm-linux-gcc4.3.3(使用过其它较低版本3.4.5则不会出现这个问题)加载fat.ko等fat文件系统模块时候会报错,并不是全部都报错,某些简单的如led.ko不会。
1.修改 include/asm-arm/elf.h 文件
添加定义:
#define R_ARM_V4BX 40
2.arch/arm/kernel/module.c
int
apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex,
unsigned int relindex, struct module *module)
{
...
case R_ARM_V4BX: //added
/* Preserve Rm and the condition code. Alter
* other bits to re-code instruction as
* MOV PC,Rm.
*/
*(u32 *)loc &= 0xf000000f;
*(u32 *)loc |= 0x01a0f000;
break;
default:
printk(KERN_ERR "%s: unknown relocation: %u\n",
module->name, ELF32_R_TYPE(rel->r_info));
return -ENOEXEC;
...
}