什么是"mov offset(％rip)，％rax"?做? [英] what does "mov offset(%rip), %rax" do?

问题描述

rax是否获得偏移量加上该指令的地址或下一条指令的地址?从微代码的角度来看，如果答案是下一条指令，则可能会更容易.

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(另请参见分支).

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，即RIP相对(相对指令指针)寻址，是在64位模式下实现的.通过在下一条指令的64位RIP上添加位移来形成有效地址.

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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