CS456 - Systems Programming Spring 2026

Displaying ./code/nasm/forkexec/execute.asm

; Execute
; Compile with: nasm -f elf execute.asm
; Link with (64 bit systems require elf_i386 option): ld -m elf_i386 execute.o -o execute
; can also compile by typing "make execute" as we have a Makefile
; Run with: ./execute
 
%include        '../functions.asm'
 
SECTION .data
command         db      '/bin/sleep', 0h     ; command to execute
arg1            db      '5', 0h
arguments       dd      command
                dd      arg1                ; arguments to pass to commandline (in this case just one)
                dd      0h                  ; end the struct
environment     dd      0h                  ; arguments to pass as environment variables (inthis case none) end the struct
 
SECTION .text
global  _start
 
_start:
 
    mov     edx, environment    ; address of environment variables
    mov     ecx, arguments      ; address of the arguments to pass to the commandline
    mov     ebx, command        ; address of the file to execute
    mov     eax, 11             ; invoke SYS_EXECVE (kernel opcode 11)
    int     80h
 
    call    quit                ; call our quit function