86 lines
968 B
NASM
86 lines
968 B
NASM
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extern puts
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%include "../inc/length_func.inc"
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section .data
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text db "42",0
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section .text
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global main
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main:
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sub rsp, 8
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mov r8, text
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call length_func
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mov r9, rax
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mov r11, r9
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mov r8, text
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_loop:
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mov r10b, [r8]
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cmp r10b, 0
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jz _exitloop ;if its zero we have reached the end of the string
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mov r10b, [r8]
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sub r10b, 48 ; change "0" into 0
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mov [r8], r10b
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add r8, 1
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jmp _loop
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xor rcx, rcx
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add rcx, 1
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_exitloop:
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cmp r9, r8
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je _addvalues
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mov r10b [r9]
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mul r10b, rcx
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mov [r9], r10b
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sub r9, 1
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mul rcx, 10
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jmp _exitloop
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add r9, 1
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_addvalues:
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cmp r9, r11
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je _end
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mov r10b, [r8]
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mov r11b, [r9]
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add r11b, r10b
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mov [r9], r11b
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add r8, 1
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add r9, 1
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jmp _addvalues
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;this returns the r8 pointer
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;mov rdi, text
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;cld
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;call puts ;this is the put s way of printing a string
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_end:
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add rsp, 8
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ret
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; mov rax, 60 ; exit
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; mov edi, 1 ; error 1 dont need the exit anymore beacue libc or somthing
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; syscall
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