undefined reference to '_modsi3'和`__udivdi3'
【问题描述】： 自己实现printf函数来方便裸板调试打印的时，在printf函数中用到了求余%和除法/操作： 结果报错： 【问题分析】： ARM是精简指令集，对求余和除法操作基本上不支持，所以应该尽量避免上述操作。 【解决方法】： linux内核源码linux/arch/arm/lib/lib1funcs.S实现支持除法、求模操作等操作的库函数，下载地址:https://gitee.com/zg
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