[Nasm-users] code problems--relatively new

[Tyler L. <ty...@ty...>]

Hello,
I've spent the last couple hours trying to debug this, and haven't found 
much.
I"m writing a proc that would take what is in eax, and run through that and 
print byte-by-byte the message supplied in eax,
here's the code--assistance would be awesome if possible.
section .data
buff db "Hello world!",0 ;the message we're going to print
section .text
global _start:
_start:
mov eax,buff ;moves the buffer address to eax for the call.
call write ;will write what ever is stored at eax byte by byet.
call exit ;exits

write:
mov esi,eax ;get what's stored in eax (hopefully an address) and store it in 
esi.
jmp .wloop
.wloop: ;the loop.
call pc
mov cl,[esi] ;moves the dereferenced esi to cl.
movzx ecx, byte [esi]
cmp cl,0 ;is the byte a null character?
je .wend
mov eax,4
mov ebx,1
mov edx,1
int 80h ;print the character.
inc esi ;move the pointer to the next char in the buffer.
jmp .wloop ;restart the loop
.wend:
ret

exit:
mov eax,1
mov ebx,1
int 80h
ret

pc:
mov eax,4
mov ebx,1
mov ecx,'d'
mov edx,1
int 80h
ret

Thanks,
Tyler Littlefield
email: ty...@ty...
web: tysdomain-com
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skype: st8amnd2005