“mov offset(%rip), %rax"是什么意思?做? [英] what does "mov offset(%rip), %rax" do?

问题描述

rax 是得到偏移量加上这条指令的地址，还是下一条?从微码的角度来看，如果答案是下一条指令可能会更容易.

Does rax get offset plus the address of this instruction, or the next? From a microcode point of view it might be easier if the answer was the next instruction.

推荐答案

下一个.这是 x86 上的一般规则(另见分支).

The next. That's a general rule on x86 (see also branches).

在英特尔手册第 2 卷第 2.2.1.6 节 RIP 相对寻址中:

In Intel's manual volume 2 section 2.2.1.6 RIP-Relative Addressing:

一种新的寻址形式，RIP-relative(相对指令指针)寻址，是在 64 位模式下实现的.下一条指令的 64 位 RIP 加上位移形成有效地址.

A new addressing form, RIP-relative (relative instruction-pointer) addressing, is implemented in 64-bit mode. An effective address is formed by adding displacement to the 64-bit RIP of the next instruction.

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