MOV to register from memory not working with BITS 32 in nasm

I am just starting with x86 assembly and was trying some basics with the MOV instruction. (code below)

BITS 32SECTION .data                       somedata: db "Hello world",10SECTION .text                       global _start                   _start:     mov eax, somedata    mov al, [eax]    mov edx, [somedata]

I seem to not understand why nasm is using RIP relative addressing, when it is specified BITS 32 in the assembly (I thought the relative addressing in only in the 64 bit mode). Moreover it is using RAX in 32 bit mode. If I do not specify anything, it seems to not use relative addressing and uses EAX.

Code with BITS 32

Disassembly of section .text:00000000004000b0 <_start>:  4000b0:   b8 c0 00 60 00          mov    eax,0x6000c0  4000b5:   8a 00                   mov    al,BYTE PTR [rax]  4000b7:   8b 15 c0 00 60 00       mov    edx,DWORD PTR [rip+0x6000c0]        # a0017d <_end+0x4000ad>

Code without BITS 32

Disassembly of section .text:00000000004000b0 <_start>:  4000b0:   b8 c0 00 60 00          mov    eax,0x6000c0  4000b5:   67 8a 00                mov    al,BYTE PTR [eax]  4000b8:   8b 14 25 c0 00 60 00    mov    edx,DWORD PTR ds:0x6000c0

I know it is not the assembler, it is me. What is it that I am doing wrong?

PS:

• Using nasm, and 64 bit computer with linux.

• Assembling using nasm -f elf64 -F stabs -g sandbox.asm -o sandbox.o

• Disassembling using objdump -M intel -d sandbox

I also tried the following assembler and linker flags:

nasm -f elf32 -F stabs -g sandbox.asm -o sandbox.old -oformat=elf32-i386 -o sandbox sandbox.o

but it is not working saying ld: i386 architecture of input file `sandbox.o' is incompatible with i386:x86-64 output