macOS NASM and Mac format

[davidlt]

Hello, I have never did Asm programming on UNIX type operating system and now I have tried it. I am using preisntalled NASM as compiler. I took simple Hello World program to try it for the first time and compiled like this:
nasm -f macho -o hello hello.asm

and tried to launch it:
./hello

I got message that permission was denied and then I tried with sudo the same and got message: "sudo: ./hello: command not found".

The question would be how to compile to Mac executive file and run it without any problems?

 

[lee1210]

This thread:
https://forums.macrumors.com/threads/455794/

Goes through a lot of what you'll need to do to get this going.

-Lee

 

[davidlt]

Okay, Linux was even easier, I did not know that UNIX is using stack for the arguments, thanks...

Any doc with full syscalls information for Mac?

 

[Cromulent]

Any doc with full syscalls information for Mac?

Any FreeBSD documentation should be fine.

Edit : If you want the specific numbers to use for specific system calls they are located in /usr/include/sys/syscall.h

Edit 2 : This is a useful document :

http://www.freebsd.org/doc/en/books/developers-handbook/x86.html

 

[Muncher]

Look here.

 

[larkost]

I don't know a thing about asm, but it seems to be that the problem might be that the output file is not set as executable. If you "chmod +x" it, then it might work.

 

[Muncher]

I don't know a thing about asm, but it seems to be that the problem might be that the output file is not set as executable. If you "chmod +x" it, then it might work.

That could do it.

 

[Cromulent]

That could do it.

As long as you are assembling using the following commands it should just work.

nasm -f macho myfile.s
ld -o my_test_asm_prog myfile.o