nasm - Assembly Language -
i need following covert problem in assembly 64-bit nasm. convert decimal binary , vice versa. when print dont right answers integer part of binary decimal , fraction part of binary decimal. comments appreciated. feedback.
here output:
the integer part of decimal binary is: 1111100 fraction part of decimal binary .011 integer part of binary decimal 173 fraction part of binary decimal .768 here code:
;convert: convert numbers between bases ;compile: nasm -f elf64 -l convert.lst convert.asm ;link: gcc -m64 -o convert convert.o ;run: ./convert extern printf section .data data1: db '1','2','4','.','3','7','5' data2: dd 01010110110101b m: db 2 i: dq 1000.0 ; print format fam: db "conversion between bases",10,0 fam2: db "the integer part of decimal binary is: %ld%ld%ld%ld%ld%ld",0 fam3: db "the fraction part of decimal binary .%ld%ld%ld",10,0 fam4: db "the integer part of binary decimal %ld",10, 0 fam5: db "the fraction part of binary decimal .%ld",10,0 fam6: db "%ld",10,0 section .bss ;uninitialized spaces b: resq 1 c: resq 10 d: resq 1 section .text ;instruction code segment global main ;for gcc standard linking main: ;; converting integer part of data1 push rbp ;setup stack mov rdi, fam mov rax, 0 mov al, [data1] ;move first index of data1 sub rax, 48 ;convert ascii code decimal imul rax,100 ;multiply place value mov [b], rax mov rax, 0 mov al,[data1+1] ;move second index register sub rax, 48 imul rax, 10 add rax, [b] mov [b], rax mov rax, 0 mov al, [data1+2] ;move third index register sub rax, 48 add rax, [b] ;the decimal value of number mov [b], rax mov rdx, 0 mov rcx, 2 div rcx mov [b], rax mov rsi, rdx mov rax, 0 call printf ;print first line of output mov r8, 0*8 ;count loop1: mov rax, 0 mov rax, [b] ;load b register mov rdx, 0 mov rcx, 2 ;load 2 register rcx div rcx ;divide 2 mov qword[c+r8],rdx ;save reminder in array c mov [b], rax add r8,8 ;increament count cmp r8, 5*8 ;compare if less or equal jle loop1 ;jump instruction mov rdi, fam2 ;format print out converted binary number mov rsi, qword[c+5*8] mov rdx, qword[c+4*8] mov rcx, qword[c+3*8] mov r8, qword[c+2*8] mov r9, qword[c+1*8] mov r10, qword[c+0*8] mov rax, 0 call printf mov rdi, fam6 ;format printout last remainder mov rsi, 0 mov rax, 0 call printf ;; converting fraction part of decimal number mov rax, 0 mov al, [data1+4] ;load fourth index sub rax, 48 ;change decimal number imul rax, 100 ;multiply place value mov [b], rax mov rax, 0 mov al,[data1+5] ;load fifth index of integer sub rax, 48 ;convert decimal number imul rax, 10 add rax, [b] mov [b], rax mov rax, 0 mov al, [data1+6] ;move the 6th index of data 1 sub rax, 48 ;convert decimal add rax, [b] mov [b], rax mov rax, 0 mov rcx, 0 loop2: mov rax, [b] ;instead of working on .375 work on 375 imul rax, 2 cmp rax, 1000 ;compare if multiplication 100 mov rdx, 0 mov [c+8], rdx ; if multiplication less 1000 store add rcx, 1 ; 0 in c array jle loop2 ;if rax less 1000 jump loop2 jg loop3 ;if rax greater 1000 jump loop3 loop3: mov rdx, 1 ; if rax grater rax store 1 in array [c] mov [c+1*8], rdx add rcx, 1 sub rax, 1000 ;after storing 1 in array c subtruct 1000 start th imul rax, 2 ; loop again cmp rax, 1000 je loop4 loop4: mov rdx, 1 mov [c+3*8], rdx mov rax, 0 mov rdi, fam3 mov rax, [c] mov rsi, rax mov rdx, [c+8] mov rcx, [c+2*8] call printf mov rax, 0 mov rdi, fam4 mov rdx, [data2] shld ax, dx, 11 mov rsi, rax mov rax, 0 call printf mov rax, 0 mov rdx, 0 mov rdx, [data2] shl rdx, 11 shld bx, dx, 5 mov rdx, 0 mov al, 1 shl bx, 3 mov ch, 0 loop5: cmp ch,4 je loop6 mov cl, 2 mov bh, 0 imul cl shl bx, 1 inc ch cmp bh, 1 jne loop5 push rcx push rax mov al, 1 pop rcx push rcx push rdx mov rdx, 0 loop7: idiv cl pop rdx add dx, ax pop rax pop rcx inc ch jmp loop5 loop6: mov rdi, fam5 mov rsi, rdx mov rax, 0 call printf pop rbp mov rax, 0 ret