amd64/bareMetalOS-0.5.2/baremetal0.5.2/programs/argtest.asm

   1 ; Argument Test Program (v1.0, July 6 2010)
   2 ; Written by Ian Seyler
   3 ;
   4 ; BareMetal compile:
   5 ; nasm argtest.asm -o argtest.app
   6
   7
   8 [BITS 64]
   9 [ORG 0x0000000000200000]
  10
  11 %INCLUDE "bmdev.asm"
  12
  13 start:                                  ; Start of program label
  14
  15         call b_get_argc                 ; Get the number of arguments that were passed
  16         cmp al, 1                       ; Was the number 1?
  17         je noargs                       ; If so then bail out. The first argument is the program name
  18         mov rsi, hello_message          ; Load RSI with memory address of string
  19         call b_print_string             ; Print the string that RSI points to
  20         mov al, 1                       ; Argument values start at 0 so we want the second one
  21         call b_get_argv                 ; Set RSI to point to the second argument
  22         call b_print_string             ; Print the string
  23         call b_print_newline            ; Print a new line
  24         jmp fin                         ; Skip to the end
  25
  26 noargs:
  27         mov rsi, noargs_message         ; Print the error message
  28         call b_print_string
  29
  30 fin:
  31
  32 ret                                     ; Return to OS
  33
  34 hello_message: db 'Hello, ', 0
  35 noargs_message: db 'Abort: No arguments supplied.', 13, 0