通过 linux x86-64 函数调用保留了哪些寄存器

问题描述

我相信我了解 linux x86-64 ABI 如何使用寄存器和堆栈将参数传递给函数(参见 之前的 ABI 讨论).我感到困惑的是，如果/哪些寄存器应该在函数调用中保留.也就是说，哪些寄存器可以保证不被破坏?

I believe I understand how the linux x86-64 ABI uses registers and stack to pass parameters to a function (cf. previous ABI discussion). What I'm confused about is if/what registers are expected to be preserved across a function call. That is, what registers are guarenteed not to get clobbered?

推荐答案

这里是完整的寄存器表及其使用文档 [PDF 链接]:

Here's the complete table of registers and their use from the documentation [PDF Link]:

r12、r13、r14、r15、rbx、rsp、rbp 是被调用者保存的寄存器 - 它们在跨函数调用保留"列中有一个是".

r12, r13, r14, r15, rbx, rsp, rbp are the callee-saved registers - they have a "Yes" in the "Preserved across function calls" column.

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