All about x86

Content

Godbolt Compiler Explorer

Tools | CTF

The Godbolt compiler explorer allows the user to compile a function and see the corresponding assembly code. It can highlight matching parts in the language and assembly, making it easy to understand how individual expressions are compiled. It supports common languages like C, C++, Go, Rust. It can also work with assembler and LLVM IR.

Another nice feature is, that it can show statistics about assembler code, like needed cycles, instructions, and which resources the instructions need. This uses the LLVM Machine Code Analyzer.

---

Linux System Call Table

Cheatsheet | CTF | Datasets

These websites provided an overview over the Linux systemcall interface by listing the syscall numbers, their meanings, and their arguments.

• https://syscalls.kernelgrok.com/
  • x86
• http://blog.rchapman.org/posts/Linux_System_Call_Table_for_x86_64/
  • x64
• https://filippo.io/linux-syscall-table/
  • x64
• https://syscalls64.paolostivanin.com/
  • x64
• https://thevivekpandey.github.io/posts/2017-09-25-linux-system-calls.html
  • x64

---

Online Dis-Assembler

CTF | Tools

Website allowing assembly and disassembly of x86 and x64 code.

---

x86 Instruction Set

Datasets | Cheatsheet | CTF

These websites provide reference documentation of the x86 instruction set:

• https://kernfunny.org/x86/ / https://c9x.me/x86/
• https://www.felixcloutier.com/x86/index.html
  • Linked from Godbolt
• http://ref.x86asm.net/coder.html
  • It provides an index for single- and double-byte opcodes based on the bytes