Объясните как работает программа, пожалуйста

[Flow75]

global _start
section .bss
a1 resb 255
a2 resb 255
section .data
n dd 0
m dd 0
el dd 0xA
of_msg: db "Overflow",0xA,0x0
section .text
_start:

mov eax,3
mov ebx,0
mov edx,255
mov ecx,a1
int 0x80
mov eax,3
mov ebx,0
mov ecx,a2
mov edx,255
int 0x80

xor esi,esi
mov ecx,10
mov esi,a2
xor eax,eax
next_digit2:
movzx edx,byte[esi]
inc esi
cmp edx,'0'
jl p2
cmp edx,'9'
jg p2
sub edx,'0'
mov ebx,eax
mov ecx,0

ForMultiplyTN2:
add eax,ebx
inc ecx
cmp ecx,9
jl ForMultiplyTN2
add eax,edx
jo of_msg_f
inc edi
jmp next_digit2
p2:

mov [m],eax
cmp eax,1
jne stry
mov eax,a1
call sprint
call quit

stry:
cmp eax,0
jne prg
mov eax,1
add eax,30h
mov [n],eax
mov eax,n
call sprintLF
call quit

prg:
mov edi,0
mov esi,a1
xor eax,eax
next_digit1:
movzx edx,byte[esi]
inc esi
cmp edx,'0'
jl p1
cmp edx,'9'
jg p1
sub edx,'0'
mov ebx,eax
mov ecx,0

ForMultiplyTN1:
add eax,ebx
inc ecx
cmp ecx,9
jl ForMultiplyTN1
add eax,edx
jo of_msg_f
inc edi
jmp next_digit1

p1:
cmp edi,255
jg of_msg_f ;>
xor edi,edi
mov [n],eax

mov edi,1
mov eax,[n]
mov ebx,[n]
loop1:
cmp edi,[m]
jge endl3
mov esi,1
loop2:
cmp esi,[n]
jge endl2
add eax,ebx
jo of_msg_f
inc esi
jmp loop2
endl2:
mov ebx,eax
inc edi
jmp loop1
endl3:
jmp greatpr

of_msg_f:
mov eax,of_msg
call sprint
call quit
greatpr:
call printLNum
endl1:
mov eax,el
call sprint
call quit
slen:
push ebx
mov ebx, eax
nextchar:
cmp byte [eax], 0
jz finished
inc eax
jmp nextchar
finished:
sub eax,ebx
pop ebx
ret
sprint:
push edx
push ecx
push ebx
push eax
call slen
mov edx,eax
pop eax
mov ecx,eax
mov ebx,1
mov eax,4
int 80h
pop ebx
pop ecx
pop edx
ret
sprintLF:
call sprint
push eax
mov eax,0Ah
push eax
mov eax,esp
call sprint
pop eax
pop eax
ret
printLNum:
push eax
push ebx
push ecx
push edx
push esi
push edi
cmp eax,0
jg printLNumNZ
mov eax,zero
call sprint
jmp endPrintLNumWriting
printLNumNZ:
mov edi,0
printLNumPrep:
cmp eax,1
jl endPrintLNumPrep
mov edx,0
mov ecx,10
div ecx
push edx
inc edi
jmp printLNumPrep
endPrintLNumPrep:
mov ebx,1
printLNumWriting:
cmp edi,0
je endPrintLNumWriting
pop eax
add eax,30h
mov [n],eax
mov eax,n
call sprint
dec edi
jmp printLNumWriting
endPrintLNumWriting:
pop edi
pop esi
pop edx
pop ecx
pop ebx
pop eax
ret
multiplyTN:
push ecx
push edx
dec ebx
mov ecx,0
mov edx,eax
_ForMultiplyTN:
add eax,edx
inc ecx
cmp ecx,ebx
jl _ForMultiplyTN
pop edx
pop ecx
ret
quit:
mov ebx, 0
mov eax, 1
int 80h
ret
_divideTN:
push ecx
xor ecx,ecx
_ForDivideTN:
cmp eax,ebx
jl _EndForDivideTN
inc ecx
sub eax,ebx
jmp _ForDivideTN
_EndForDivideTN:
mov ebx,eax
mov eax,ecx
pop ecx
ret
_printSymb:
push eax
push ebx
push ecx
push edx
mov ecx,eax
mov eax,4
mov ebx,1
mov edx,4
int 0x80
pop edx
pop ecx
pop ebx
pop eax
ret