“银行"是什么意思? [英] What does 'bank'ing a register mean?

问题描述

在 Wikipedia 上阅读ARM 架构"，发现如下语句:

Reading 'ARM Architecture' on Wikipedia and found the following statement:

寄存器 R0-R7 在所有 CPU 模式下都是相同的；他们从来不是银行.

Registers R0-R7 are the same across all CPU modes; they are never banked.

R13 和 R14 跨所有特权 CPU 模式存储，系统除外模式.

R13 and R14 are banked across all privileged CPU modes except system mode.

银行注册是什么意思?

推荐答案

寄存器银行是指在同一地址提供多个寄存器副本.

Register banking refers to providing multiple copies of a register at the same address.

取自 arm 的第 1.4.6 节 文档

Taken from section 1.4.6 of the arm docs

该术语是指无法同时看到所有寄存器的问题的解决方案.

The term is referring to a solution for the problem that not all registers can be seen at once.

每种处理器模式都有不同的寄存器组.分组寄存器为处理处理器异常和特权操作提供了快速的上下文切换.

There is a different register bank for each processor mode. The banked registers give rapid context switching for dealing with processor exceptions and privileged operations.

如果您正在寻找更理论的推理，我推荐 this纸.
给出了比我更深刻的答案 这里

If your looking for a more theoretical reasoning, I recommend this paper.
A much deeper answer than mine is given here

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