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Robinguo2012 avatar Robinguo2012 commented on July 22, 2024

为了去掉指令地址中的指针标签。因为ARMv7 中的地址分为Thumb Mode 和 Normal Mode，对应的指令地址分别是2字节 和 4字节，arm64下指令地址都是4字节，（按照4字节对齐存储，一条指令必须从4的整数倍地址来取）所以指令地址的最后2 bits 肯定都是0，系统一般会在这后两位中插入一个指针标签，要去掉这个标签的值才是真正的指令地址。而x86_64中指令是可变长度的，所有的bits 都是有意义的。
这个宏的作用就是为了适配x86 和 arm平台的指令处理方式不同。
https://github.com/kstenerud/KSCrash/blob/master/Source/KSCrash/Recording/Tools/KSSymbolicator.c

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