windows - 如何在 NASM 的 BSS 部分创建变量？

Question

我试图在 NASM 的 BSS 部分创建一个变量:

section .bss
    i DD 12345

但是在尝试创建目标文件时，我收到以下警告:

warning: attempt to initialize memory in BSS section `.bss': ignored

我想这是可以理解的，因为 BSS 部分只能包含未初始化的变量。所以我尝试了以下方法:

section .bss
    i DD 0

但我仍然收到同样的警告。

Answer 1

使用 RESB和 friend 。见 nasm manual :

3.2.2 RESB and Friends: Declaring Uninitialized Data

RESB, RESW, RESD, RESQ, REST, RESO, RESY and RESZ are designed to be used in the BSS section of a module: they declare uninitialized storage space. Each takes a single operand, which is the number of bytes, words, doublewords or whatever to reserve. As stated in section 2.2.7, NASM does not support the MASM/TASM syntax of reserving uninitialized space by writing DW ? or similar things: this is what it does instead. The operand to a RESB-type pseudo-instruction is a critical expression: see section 3.8.

For example:

buffer: resb 64 ; reserve 64 bytes