Overlap, Non-Overlap Block Transfer (Assembly x86)
section .data msg db 10,13,”Entered Array is” msg_l equ $-msg msg1 db 10,13,”Select Operation:” msg_l1 equ $-msg1 msg2 db 10,13,”1.Overlapped Transfer” msg_l2 equ $-msg2 msg3 db 10,13,”2.Non-Overlapped Transfer” msg_l3 equ $-msg3 msg6 db 10,13,”4.Non-Overlapped Transfer with String Instruction” msg_l6 equ $-msg6 msg7 db 10,13,”3.Overlapped Transfer with String Instruction” msg_l7 equ $-msg7 msg4 db 10,13,”5.Exit” msg_l4 equ $-msg4 msg5 db 10,13,”Enter Overlap position” msg_l5 equ $-msg5 msg0 db 10,13,”Transferred Array is” msg_l0 equ $-msg0 nwline db 10 arr dd 11111111h,22222222h,33333333h,44444444h newarr times 8 dd 0 section .bss opt resb 2 pos resb 1 cnt resb 1 cnt1 resb 1 temp resb 1 disp_buff resb 8 %macro display 2 mov eax,4 mov ebx,1 mov ecx,%1 mov edx,%2 int 80h %endmacro %macro accept 2 mov eax,3 mov ebx,0 mov ecx,%1 mov edx,%2 int 80h %endmacro section .data global _start _start: display msg1,msg_l1 display msg2,msg_l2 display msg3,msg_l3 display msg7,msg_l7 display msg6,msg_l6 display msg4,msg_l4 display nwline,1 accept opt,2 sub byte [opt],30h cmp byte [opt],01h je OVP cmp byte [opt],02h je NON_OVP cmp byte [opt],03h je OVP_S cmp byte [opt],04h je NON_OVP_S cmp byte [opt],05h je exit call exit ;–OVP– OVP: display msg,msg_l mov byte [cnt],4h mov edi,arr call original_to_ascii call COPYNUM call COPY display msg0,msg_l0 mov al,[pos] mov byte [cnt],al mov edi,arr call original_to_ascii jmp _start original_to_ascii: push ecx display nwline,1 pop ecx mov ebx,[edi] mov ecx,8 mov esi,disp_buff l4: rol ebx,4 mov dl,bl and dl,0fh cmp dl,09h jbe l5 add dl,07h l5: add dl,30h mov [esi],dl inc esi loop l4 add edi,4 display disp_buff,8 dec byte [cnt] jnz original_to_ascii display nwline,1 ret COPYNUM: mov esi,arr mov edi,arr mov byte [cnt],4h pos_esi: add esi,4 dec byte [cnt] jnz pos_esi sub esi,4 display msg5,msg_l5 display nwline,1 accept pos,2 sub byte [pos],30h mov byte [cnt],4h mov al,[pos] add al,[cnt] mov [cnt],al dec byte [cnt] mov [pos],al dec byte [pos] pos_edi: add edi,4 dec byte [cnt] jnz pos_edi sub edi,4 ret COPY: mov byte [cnt1],4h lnew: mov eax,[esi] mov [edi],eax sub esi,4 sub edi,4 dec byte [cnt1] jnz lnew ret ;–NON_OVP– NON_OVP: display msg,msg_l mov edi,arr mov byte [cnt],4h call original_to_ascii call COPYNUMA display msg0,msg_l0 mov byte [cnt],4h mov edi,newarr call original_to_ascii jmp _start COPYNUMA: mov esi,arr mov edi,newarr mov byte [cnt1],4h lnewA: mov eax,[esi] mov [edi],eax add esi,4 add edi,4 dec byte [cnt1] jnz lnewA ret ;–OVP_STRING– OVP_S: mov edi,arr mov byte [cnt],4h display msg,msg_l call original_to_ascii call COPYNUM display msg0,msg_l0 std mov ecx,4 l1O: movsd loop l1O mov al,[pos] mov byte [cnt],al mov edi,arr call original_to_ascii jmp _start ;–NON_OVP_STRING– NON_OVP_S: display msg,msg_l mov edi,arr mov byte [cnt],4h call original_to_ascii mov esi,arr mov edi,newarr mov ecx,4 l1S: movsd loop l1S display msg0,msg_l0 mov byte [cnt],4h mov edi,newarr call original_to_ascii jmp _start ;–EXIT– exit: mov eax,1 mov ebx,0 int 80h