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NetRoc's blog | About programming technology
关于模式转换和跳转 Arm下主要的分支指令如BX,BLX等,都可以切换指令模式。详见arm的用户手册。这里主要讨论模式的选择和切换时机。只有一个问题需要注意,arm处理器执行时,由于流水线的关系,会预取两条指令,因此当前指令取到的pc值,始终是之后第三条指令的地址。比如当前指令地址是0x8000,那么当前pc的值,在thumb下面是0x8000 + 2 * 2, 在arm下面是0x8000 + 4...