BRSL stands for "branch relative and set link." This branches to the function entry point and sets the link register (LR) to the next instruction for the return address.
brsl代表“branch relative and set link”，用来分支到函数的入口点并将链接寄存器(LR)设置为返回地址的下一个指令。
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A path is an instruction sequence that threads through the program from entry to final exit.