Do the variables declared in the section .bss in NASM gets loaded in the data section of a process and not in the bss section of a process?

Question

I have assembled the following code using NASM:

global _start

section .data
    var1 DD 0xA1A2A3A4        ; 4 bytes
    var2 DD 0xB1B2B3B4        ; 4 bytes
section .bss
    var3: RESD 1              ; 4 bytes

section .text
_start:
    mov DWORD [var3], 0xC1C2C3C4

I opened the file in OllyDbg and made it execute the instruction: mov DWORD [var3], 0xC1C2C3C4.

This is the state of the lower left pane in OllyDbg after executing this instruction, along with the memory map:

As you can see, the data section starts at address 0x00F02000 and its size is 0x1000 bytes (and so var3 is part of the data section).

Edit:

I created the object file using the following command:

nasm -f win32 D:\1.asm

To create the EXE file, I used the following command using the Visual C++ 2010 linker:

link D:\1.obj /OUT:D:\1.exe /ENTRY:start /SUBSYSTEM:CONSOLE

Do the variables declared in the section .bss in NASM gets loaded in the data section of a process and not in the bss section of a process?

1 Answers