This repo contains a set of scripts and templates that act as a wrapper around nasm and ld that make it very easy to write quick assembly snippets for x86 and x86_64 on Linux. I wanted something easy to use like this online emulator but actually supports all of the x86 instructions.
32-bit x86: ./assemble32 yourfile.asm
64-bit x86: ./assemble64 yourfile.asm
The workflow really is the most important thing about this whole setup, and is what makes it possible to not use the online x86 emulator.
tmux + gdb + gdb-dashboard
Once you have assembeled your instructions, and you want to see what they do...
Open two tmux panes side by side with gdb and gdb-dashbard. You can follow these instructions for help
Now in the gdb prompt you can run the following commands to step through your assembly instructions:
# gdb -q helloworld
Reading symbols from helloworld...(no debugging symbols found)...done.
>>> break _start
Breakpoint 1 at 0x8048080
>>> run
Starting program: /home/brian/Projects/EZ_ASM/helloworld
Breakpoint 1, 0x08048080 in _start ()
>>> si
0x08048085 in _start ()
>>>[enter]