Program ends up giving segmentation fault error

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section .data
hell db "Hello",10
bye db "Bye",10

section .text

global _start
_start:
mov r10,1
cmp r10,1
je _hell

cmp r10,0
jne _bye

mov rax,60
mov rdi,0
syscall

_hell:
mov rax,1
mov rdi,1
mov rsi,hell
mov rdx,6
syscall
ret

_bye:
mov rax,1
mov rdi,1
mov rsi,bye
mov rdx,4
syscall
ret

the output that it gives:

Hello
Segmentation fault (core dumped)

What I have tried:

I have no clue why I am getting this error.Why is it giving the Segmentation fault (core dumped) error and how to fix it?

steps which I have followed to compile and run:

(compiling)$ nasm -f elf64 -o jump.o jump.asm
(linking)$ ld -o jump jump.o
(running)$ ./jump

English is not my native language excuse me please.

Posted 19-Dec-20 23:27pm

fMuwouJjdjdoue

Updated 20-Dec-20 1:43am

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Patrice T · Accepted Answer · 2020-12-20T01:10:00

Quote:
I have no clue why I am getting this error.Why is it giving the Segmentation fault (core dumped) error and how to fix it?

I fear you need to go to debugger, and for 'core dumped' I think it is postmortem debugger.
The first thing you will see is the position of crash, it help narrow the search for solution.
-----
Your code do not behave the way you expect, or you don't understand why !

There is an almost universal solution: Run your code on debugger step by step, inspect variables.
The debugger is here to show you what your code is doing and your task is to compare with what it should do.
There is no magic in the debugger, it don't know what your code is supposed to do, it don't find bugs, it just help you to by showing you what is going on. When the code don't do what is expected, you are close to a bug.
To see what your code is doing: Just set a breakpoint and see your code performing, the debugger allow you to execute lines 1 by 1 and to inspect variables as it execute.

Debugger - Wikipedia, the free encyclopedia[^]

Mastering Debugging in Visual Studio 2010 - A Beginner's Guide[^]
Basic Debugging with Visual Studio 2010 - YouTube[^]

The debugger is here to only show you what your code is doing and your task is to compare with what it should do.

Richard MacCutchan · Accepted Answer · 2020-12-20T01:43:00

C++

_hell:
mov rax,1
mov rdi,1
mov rsi,hell
mov rdx,6
syscall
ret

You jump into this code from _start. After the syscall you then do a ret, but you have nowhere to return to since this code was not called as a subroutine. You need to use a call mechanism to run these small routines, not jump straight into them.

See NASM Assembly Language Tutorials - asmtutor.com[^] for a sample.

Program ends up giving segmentation fault error

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