158 lines
2.6 KiB
NASM
158 lines
2.6 KiB
NASM
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; THIS CODE HAS NOT BEEN TESTED AND IS NOT FULLY OPERATIONAL.
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; Problem Statement: Write X86/64 ALP to convert 4-digit Hex number into its equivalent BCD number and 5-digit BCD number into its equivalent HEX number.
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; Make your program user friendly to accept the choice from user for: (a) HEX to BCD b) BCD to HEX (c) EXIT.
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; Display proper strings to prompt the user while accepting the input and displaying the result. (wherever necessary, use 64-bit registers.)
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; Code from Microprocessor (SPPU - Second Year - Computer Engineering - Content) repository on KSKA Git: https://git.kska.io/sppu-se-comp-content/Microprocessor/
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; BEGINNING OF CODE
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%macro print 2
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mov rax,1
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mov rdi,1
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mov rsi,%1
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mov rdx,%2
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syscall
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%endmacro
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%macro accept 2
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mov rax,0
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mov rdi,0
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mov rsi,%1
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mov rdx,%2
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syscall
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%endmacro
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section .data
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title db 10,"An ALP to convert BCD to HEX and vise-versa.",10
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title_len equ $-title
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menu db 10,"------ Select an option ------",10,"1 -> HEX to BCD",10,"2 -> BCD to HEX",10,"3 -> Exit",10
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menu_len equ $-menu
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hex_in db 10,"Enter your 4 digit HEX number: ",10
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hex_inlen equ $-hex_in
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bcd_out db 10,"The equivalent BCD number is: ",10
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bcd_out_len equ $-bcd_out
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bcd_in db 10,"Enter your BCD number: ",10
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bcd_inlen equ $-bcd_in
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hex_out db 10,"The equivalent HEX number is: ",10
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hex_out_len equ $-hex_out
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section .bss
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numascii resb 6 ;for input
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opbuff resb 5 ;to
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dnumbuff resb 08
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section .txt
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global _start:
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_start:
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print title,title_len
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print menu,menu_len
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accept numascii,2 ;input user choice using accept macro(2 bytes-1 for choice and 1 for enter)
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cmp byte[numascii],'1' ;ascii of 1 is 31
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jne case2
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call hextobcd
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case2:
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cmp byte[numascii],'2'
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jne case3
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call bcdtohex
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case3:
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cmp byte[numascii],'3'
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je exit
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exit:
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mov rax,60
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mov rdx,0
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syscall
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hextobcd:
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print hex_in,hex_inlen
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accept numascii,5
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call packnum
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mov rcx,0
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mov ax,bx
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mov bx,0Ah
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h2bup1:
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mov rax, 0 ; Clear rax before each division
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div bx
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push rdx
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inc rcx
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cmp ax,0
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jne h2bup1
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h2bup2:
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pop rdx
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add dl,30h
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mov [rdi],dl
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inc rdi
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dec rcx
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jnz h2bup2
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packnum:
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mov bx,0
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mov rcx,4
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mov rsi,numascii
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up1:
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rol bx,04
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mov al,[rsi]
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cmp al,39h
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jbe skip1
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sub al,07h
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skip1:
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sub al,30h
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add bl,al
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inc rsi
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loop up1
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ret
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bcdtohex:
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print bcd_in,bcd_inlen
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accept numascii ,6
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print hex_out,hex_out_len
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mov rcx,05
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mov rsi,numascii
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mov rax,0
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mov rbx,0Ah
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again1:
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mov rdx,0
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mul rbx
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mov dl,[rsi]
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sub dl,30h
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add rax,rdx
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inc rsi
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loop again1
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mov rbx,rax
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call dispnum_32
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ret
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dispnum_32:
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mov rdi,dnumbuff
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mov rcx,16
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up2:
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rol rbx,04
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mov dl,bl
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and dl,0Fh
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add dl,30h
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cmp dl,39h
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jbe dskip1
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add dl,07h
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dskip1:
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mov [rdi],dl
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inc rdi
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loop up2
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print dnumbuff,16
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ret
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; END OF CODE
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