为什么不能一个字节推到奔腾IA-32堆栈？ [英] Why is it not possible to push a byte onto a stack on Pentium IA-32?

问题描述

我是来学习，你不能直接推到字节英特尔奔腾的堆栈，任何人都可以给我讲解一下好吗？

I've come to learn that you cannot push a byte directly onto the Intel Pentium's stack, can anyone explain this to me please?

这是我一直在给出的原因是因为ESP寄存器字寻址（或者，这是假设在我们的模型），它必须是一个连地址。我会承担一些递减32位二进制数不会与寄存器的排列混乱的价值，但显然我不明白就好了。

The reason that I've been given is because the esp register is word-addressable (or, that is the assumption in our model) and it must be an "even address". I would have assumed decrementing the value of some 32-bit binary number wouldn't mess with the alignment of the register, but apparently I don't understand enough.

我已经尝试了一些NASM测试，并拿出如果我声明一个变量（DB咬123），并将它推到堆栈，ESP是递减4（表明它推32位？）。但是，推字节咬（对不起，我选择的变量名），将导致一种错误：

I have tried some NASM tests and come up that if I declare a variable (bite db 123) and push it on to the stack, esp is decremented by 4 (indicating that it pushed 32-bits?). But, "push byte bite" (sorry for my choice of variable names) will result in a kind error:

TEST.ASM：10：错误：不支持非32位ELF重

test.asm:10: error: Unsupported non-32-bit ELF relocation

智慧的任意一个关键词将是极大的这段乱世pciated AP $ P $。我第一年的本科所以对不起，我在任何的这种天真。

Any words of wisdom would be greatly appreciated during this troubled time. I am first year undergraduate so sorry for my naivety in any of this.

推荐答案

其基于堆栈的创建方式：

Its based on how the stack was created:

的地址大小属性
  堆栈段确定堆栈
  指针的大小（16位，32位或64位）。该
  当前的操作数大小属性
  code段确定的金额
  堆栈指针（2，4或
  8个字节）。

The address-size attribute of the stack segment determines the stack pointer size (16, 32 or 64 bits). The operand-size attribute of the current code segment determines the amount the stack pointer is decremented (2, 4 or 8 bytes).

在非64位模式：如果
  地址大小和操作数大小
  属性是32，在32位的ESP
  注册（堆栈指针）
  递减4如果这两个属性
  是如图16所示，16位SP寄存器（堆栈
  指针）是由2递减。

In non-64-bit modes: if the address-size and operand-size attributes are 32, the 32-bit ESP register (stack pointer) is decremented by 4. If both attributes are 16, the 16-bit SP register (stack pointer) is decremented by 2.

来源： http://www.intel.com/Assets/PDF/手动/ 253667.pdf

皮克。 4-320卷。 2B

pg. 4-320 Vol. 2B

的修改的

只是想也是一个有趣的阅读是手册的有关堆栈的部分指出，这解释了关于创建堆栈段进一步。

Just wanted to point out also that an interesting read is the section on stacks in the manual, it will explain creating a stack segment further.

http://www.intel.com/Assets/PDF/manual/ 253665.pdf

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