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;; rdtmain - main part of test program for RDX execution.
;; returns true (0) if its parameter equals the phrase "hello"
;; "hello" is stored in the library part, to complicate the
;; linkage.
;; assemble and link with the following commands:
;; nasm -f rdf rdtmain.asm
;; nasm -f rdf rdtlib.asm
;; ldrdf rdtmain.rdf rdtlib.rdf -o rdxtest.rdx
;; run with 'rdx rdxtest.rdx [parameters]' on a Linux (or possibly
;; other 32 bit OS) systems (x86 architectures only!)
;; try using '&& echo Yes' afterwards to find out when it returns 0.
[EXTERN _strcmp] ; strcmp is an imported function
[EXTERN _message] ; imported data
[SECTION .text]
[BITS 32]
;; main(int argc,char **argv)
[GLOBAL _main]
_main:
push ebp
mov ebp,esp
;; ebp+8 = argc, ebp+12 = argv
cmp dword [ebp+8],2
jb error ; cause error if < 1 parameters
mov eax, [ebp+12] ; eax = argv
mov ebx, [eax+4] ; ebx = argv[1]
mov ecx, _message ; ecx = "hello"
push ecx
push ebx
call _strcmp ; compare strings
add esp,8 ; caller clears stack
pop ebp
ret ; return return value of _strcmp
error:
mov eax,2 ; return 2 on error
pop ebp
ret
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