CODEWITHSUNDEEP
linuxbashassemblyx86-64objdump
Testare
Testare

Reputation: 378

How to turn hex code into x86 instructions

I'm trying to make a script or program that will take given bytes (given in hexadecimal), and convert them into a x86 instructions (For example c3 -> retq)

I've tried doing it by calling gcc -c on an assembly file just containing

retq
retq

and then using a script to insert bytes where it says "c3 c3", then using objdump -d to see what it says now. But it seems that it messes up the format of the file unless I only pass an instruction of the same size as the original instruction bytes.

I'm running it on a Raspbian Pi (A linux based operating system) using SSH, BASH terminal. I'm using BASH shell scripts and python, as well as the tools listed here, and gdb.

Upvotes: 0

Views: 3005

Answers (1)

Jester
Jester

Reputation: 58762

Disassemble flat binary file: objdump -D -b binary -m i386 foo.bin. Or create an object file using .byte directives from assembly source, e.g. put .byte 0xc3 into foo.s then gcc -c foo.s then objdump -d foo.o

Upvotes: 4

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