Issue
Suppose that I have an integer number in a register, how can I print it? Can you show a simple example code?
I already know how to print a string such as "hello, world".
Solution
If you're already on Linux, there's no need to do the conversion yourself. Just use printf instead:
;
; assemble and link with:
; nasm -f elf printf-test.asm && gcc -m32 -o printf-test printf-test.o
;
section .text
global main
extern printf
main:
mov eax, 0xDEADBEEF
push eax
push message
call printf
add esp, 8
ret
message db "Register = %08X", 10, 0
Note that printf
uses the cdecl calling convention so we need to restore the stack pointer afterwards, i.e. add 4 bytes per parameter passed to the function.
Answered By - Martin Answer Checked By - Pedro (WPSolving Volunteer)