256LOL - An x86 Assembler in 256 LOC
For the first “real” post in this blog, we’ll build an x86 assembler in less than 256 lines of C code. Obviously, it won’t implement every x86 instruction, but it will implement a surprisingly useful subset: data movement, control flow, integer arithmetic, bitwise operations, and function calls. We won’t be able to run the generated machine code yet (that’s coming in a later blog post), but we’ll
Assembler · Just a memo
Stack frame in x86_64 Just for a memo: +--------------+ | | + | | | +--------------+ | | | | | arg(N-1) | starts from 7'th argument for x86_64 | | | | +--------------+ | | | | | argN | | | | | +--------------+ | | | | |Return address| %rbp + 8 Stack grows down | | | | +--------------+ | | | | | %rbp | Frame base pointer | | | | +--------------+ | | | | | local var1 | %rbp - 8 | | | | +------------
x86 Assembly Language Programming with Ubuntu
x86-64 Assembly Language Programming with Ubuntu By Ed Jorgensen The purpose of this text is to provide a reference for University level assembly language and systems programming courses. Specifically, this text addresses the x86-64 instruction set for the popular x86-64 class of processors using the Ubuntu 64-bit Operating System (OS). While the provided code and various examples should work un
X86アセンブラ/x86アーキテクチャ - Wikibooks
x86アーキテクチャ[編集] x86アーキテクチャは、インテルが開発したマイクロプロセッサのアーキテクチャです。1978年に最初のx86プロセッサであるIntel 8086が登場して以来、x86アーキテクチャはPCおよび互換機市場で非常に広く普及しています。 このアーキテクチャは、以下のような特徴を持っています。 命令セット x86アーキテクチャは複数の命令セットを組み合わせています。初期のバージョンから現在のx86-64まで、多くの命令が追加され、命令セットが拡張されてきました。 互換性 x86プロセッサは、過去のアーキテクチャとの互換性を保持しています。これは、古いソフトウェアやシステムが新しいx86プロセッサで動作することを可能にしています。 アドレッシングモード x86アーキテクチャは複数のアドレッシングモードを持ち、メモリアクセスやデータ処理の柔軟性を提供しています。 セグメンテ
x86 assembly doesn't have to be scary (interactive)
Jun 18 2018 x86 assembly doesn’t have to be scary (interactive) Assembly programming can be intimidating for people who have never looked into it any deeper than a glance, but giving that it underpins how the computers we use work it can be helpful having context in regards to what is actually being run by the CPU. [Photo by: Drew Sadik] x86 PCs are impressive in that they are fully backwards comp
When the Compiler Bites
Update: There are discussions on Reddit and on Hacker News. So far this year I’ve been bitten three times by compiler edge cases in GCC and Clang, each time catching me totally by surprise. Two were caused by historical artifacts, where an ambiguous specification lead to diverging implementations. The third was a compiler optimization being far more clever than I expected, behaving almost like an
x86 Assembly/X86 Architecture - Wikibooks, open books for an open world
x86 Architecture[edit | edit source] The x86 architecture has 8 General-Purpose Registers (GPR), 6 Segment Registers, 1 Flags Register and an Instruction Pointer. 64-bit x86 has additional registers. General-Purpose Registers (GPR) - 16-bit naming conventions[edit | edit source] The 8 GPRs are as follows[1]: Accumulator register (AX). Used in arithmetic operations. Opcodes combining constants into
asm64-handout.dvi
x86-64 Machine-Level Programming∗ Randal E. Bryant David R. O’Hallaron September 9, 2005 Intel’s IA32 instruction set architecture (ISA), colloquially known as “x86”, is the dominant instruction format for the world’s computers. IA32 is the platform of choice for most Windows and Linux machines. The ISA we use today was defined in 1985 with the introduction of the i386 microprocessor, extending th
A fundamental introduction to x86 assembly programming
0. Introduction The x86 instruction set architecture is at the heart of CPUs that power our home computers and remote servers for over two decades. Being able to read and write code in low-level assembly language is a powerful skill to have. It enables you to write faster code, use machine features unavailable in C, and reverse-engineer compiled code. But starting out can be a daunting task. The o
Common x86 Calling Conventions
In some situations, we may want to integrate some hand-crafted object code into our project. This is most productively accomplished by writing Intel x86 assembly and assembling it into object code via an assembler like NASM. In other situations, we may be looking at disassembly (that may have come from C, Assembly, or both). Further, on x86 architectures all of our C/C++ code gets compiled into In
Understanding C by learning assembly - Blog - Recurse Center
Last time, Alan showed how to use GDB as a tool to learn C. Today I want to go one step further and use GDB to help us understand assembly as well. Abstraction layers are great tools for building things, but they can sometimes get in the way of learning. My goal in this post is to convince you that in order to rigorously understand C, we must also understand the assembly that our C compiler genera
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https://www.classes.cs.uchicago.edu/archive/2009/spring/22620-1/docs/handout-03.pdf
x86-64 Assembly Language Programming with Ubuntu
Let's Write Some X86-64