负载从64位地址转换成其它寄存器比RAX [英] Load from a 64-bit address into other register than rax

问题描述

在64位，从64位绝对地址（也就是废弃一个64位立即）加载可以通过

On x64, loading from a 64-bit absolute address (that is, dereferencing a 64-bit immediate) can be done by

movabs addr64, %rax

然而，当目标寄存器比 RAX 任何其他汇编器给出错误消息，为movabs操作数大小不匹配。我缺少什么？

However, when the destination register is any other than rax the assembler gives an error message saying operand size mismatch for movabs. What am I missing?

推荐答案

没有办法。它只能从AREG加载

No way. It can only load from Areg

MOVABS对于MOV运code构成气体运code名称MOV AREG，
  [Offs64]和MOV [Offs64]，AREG。在YASM的NASM语法模式，还可以
  说MOV AX，[XXX四字]得到这个表单。 YASM的天然气语法模式
  接受MOVABS（用于气体兼容性）。 注意这种形式仅与有效
  AREG（AL / AX / EAX / RAX）作为源/目的寄存器。*

MOVABS is the GAS opcode name for the MOV opcode forms "MOV Areg, [Offs64]" and "MOV [Offs64], Areg". In Yasm's NASM syntax mode, you can get this form by saying "MOV AX, [qword xxx]". Yasm's GAS syntax mode accepts MOVABS (for GAS compatibility). Note this form is only valid with Areg (AL/AX/EAX/RAX) as the source/destination register.*

http://cvs.tortall.net/pipermail/ YASM-的devel / 2006年三月/ 000579.html

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