I am trying to re-learn assembly. I have been trying to find a tutorial for assembling a program using NASM on Windows, on a CPU with the x86_64 architecture. I have been unable to make any of the provided examples work.
I am asking to be provided:
- A piece of code to assemble. The resulting program should output a message into the CLI.
- CLI commands to make an object file and to do linkage of that into an executable file.
This should preferably be done using NASM, on Windows, on x86_64 architecture, but I'm at my wit's end at this point, so I guess I will be fine with another assembler.
I intend to analyze the example and to use this as a starting point in my process of getting back into assembly.
Thank you.
Will look into it when I have time (probably not today, unfortunately).
Its not windows or NASM but this site has some 64 bit linux examples using gnu assembler (the gnu userland default assembler). You could probably find some examples for windows with nasm if you look around.
example code from the site
# ---------------------------------------------------------------------------------------- # Writes "Hello, World" to the console using only system calls. Runs on 64-bit Linux only. # To assemble and run: # # gcc -c hello.s && ld hello.o && ./a.out # # or # # gcc -nostdlib hello.s && ./a.out # ---------------------------------------------------------------------------------------- .global _start .text _start: # write(1, message, 13) mov $1, %rax # system call 1 is write mov $1, %rdi # file handle 1 is stdout mov $message, %rsi # address of string to output mov $13, %rdx # number of bytes syscall # invoke operating system to do the write # exit(0) mov $60, %rax # system call 60 is exit xor %rdi, %rdi # we want return code 0 syscall # invoke operating system to exit message: .ascii "Hello, world\n"Unfortunately, I am looking specifically for examples for Windows. I need to figure out what I'm doing wrong.
You could probably find some examples for windows with nasm if you look around
I have looked around, and I have not found any working examples of such. That is exactly why I'm asking.
It's probably way too introductory for you, but the game Turing Complete gets you to make your own toy assembly language (twice for different architectures) in the later parts and this helped me immensely when learning assembly myself.
While curious, that's not at all what I'm looking for in this case. I am looking for an example of working code and commands to build an executable from it.
For the CLI commands: https://www.nasm.us/xdoc/2.16.03/html/nasmdoc2.html#section-2.1
Have you seen this?
I haven't written asm in years though, so I cant whip up a putc loop example.
Sadly, this doesn't work. When trying to link the object file, I get a bunch of errors:
i386 architecture of input file `test.obj' is incompatible with i386:x86-64 output test.obj:test.asm:(.text+0x6): undefined reference to `_printf' undefined reference to `WinMain' collect2.exe: error: ld returned 1 exit statusI currently do not have the time to debug this.
