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ASM Print - Assembly Code Bank
ASM Print
Just a program that prints out the first argument
section .text:
global mystrlen ; int mystrlen(char* buf);
global myprint ; void myprint(char* buf);
global _start ; int _start(int argc, char* argv[])
; esp+4 = buf
mystrlen:
xor eax,eax
dec eax
mov ebx,[esp+4]
strloop:
inc eax
cmp [ebx+eax],byte 0
jne strloop
ret
; esp+4 = buf
myprint:
mov ecx,[esp+4]
push ecx
call mystrlen
mov edx,eax
mov eax,4
mov ebx,1
int 80h
pop ecx
ret
_start:
pop eax ; argc
cmp eax,2 ; if(argc != 2) { end(); }
jne end
pop eax ; argv[0] - program name
pop eax ; argv[1] - first argument
push eax
call myprint ; myprint(argv[1]);
end:
mov eax,1
mov ebx,0
int 80h ; return 0
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