rdoff/test/rdtmain.asm

   1         ;; rdtmain - main part of test program for RDX execution.
   2         ;; returns true (0) if its parameter equals the phrase "hello"
   3         ;; "hello" is stored in the library part, to complicate the
   4         ;; linkage.
   5
   6         ;; assemble and link with the following commands:
   7         ;; nasm -f rdf rdtmain.asm
   8         ;; nasm -f rdf rdtlib.asm
   9         ;; ldrdf rdtmain.rdf rdtlib.rdf -o rdxtest.rdx
  10
  11         ;; run with 'rdx rdxtest.rdx [parameters]' on a Linux (or possibly
  12         ;; other 32 bit OS) systems (x86 architectures only!)
  13         ;; try using '&& echo Yes' afterwards to find out when it returns 0.
  14
  15 [EXTERN _strcmp]                ; strcmp is an imported function
  16 [EXTERN _message]               ; imported data
  17 [SECTION .text]
  18 [BITS 32]
  19
  20         ;; main(int argc,char **argv)
  21 [GLOBAL _main]
  22 _main:
  23         push ebp
  24         mov ebp,esp
  25
  26         ;; ebp+8 = argc, ebp+12 = argv
  27
  28         cmp dword [ebp+8],2
  29         jb error                ; cause error if < 1 parameters
  30
  31         mov eax, [ebp+12]       ; eax = argv
  32
  33         mov ebx, [eax+4]        ; ebx = argv[1]
  34         mov ecx, _message       ; ecx = "hello"
  35
  36         push ecx
  37         push ebx
  38         call _strcmp            ; compare strings
  39         add esp,8               ; caller clears stack
  40
  41         pop ebp
  42         ret                     ; return return value of _strcmp
  43
  44 error:
  45         mov eax,2               ; return 2 on error
  46         pop ebp
  47         ret