assembly-300-snippets

A comprehensive collection of 300 x86-64 assembly language code snippets (using NASM syntax on Linux).

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Assembly 300 Snippets

Current Repository Progress:

Snippets: 210/300

Cheatsheets: 210/300

Samples: 210/300

Welcome to the Assembly 300 Snippets repository! This project is a comprehensive collection of 300 x86-64 assembly language code snippets (using NASM syntax on Linux) for learning and demonstration. The snippets are categorized into three difficulty levels:

Basic (1–100): Foundational concepts for beginners, covering syntax, registers, and basic operations.
Intermediate (101–200): More complex techniques, including functions, memory management, and optimization.
Advanced (201–300): Specialized applications, such as OS development, reverse engineering, and performance-critical code.

Each snippet resides in its own folder (assembly-300-snippets/XXXX-Title-Name) with a CHEETSHEET.md and SAMPLES.md files, and a README.md explaining the code, its purpose, and usage instructions.

Folder Structure

assembly-300-snippets/
├── assembly-300-snippets/
│   ├── 0001-Hello-World/
│   │   ├── code.asm
│   │   └── README.md
│   ├── 0002-Move-Register/
│   │   ├── code.asm
│   │   └── README.md
│   ├── ...
│   └── 0300-Shellcode-Execve/
│       ├── code.asm
│       └── README.md

Prerequisites

Assembler: NASM (sudo apt install nasm on Ubuntu).
Linker: GNU ld (sudo apt install binutils).
OS: Linux (Ubuntu recommended for compatibility).
Build Command: nasm -f elf64 code.asm && ld code.o -o code && ./code.

Contributing

We welcome contributions! Please read our CONTRIBUTING.md for guidelines on how to submit snippets, improve documentation, or report issues.

Community Guidelines

To ensure a welcoming environment, please adhere to our CODE_OF_CONDUCT.md.

Support

For help or questions, refer to SUPPORT.md.

Security

Found a security issue? Please report it following the guidelines in SECURITY.md.

License

This repository is licensed under the MIT License. See LICENSE for details.

Snippet List

Below is the complete list of snippet titles, hyperlinked to their respective folders in this repository.

Basic Snippets (1–100)

#	Name	Description	Snippet	Cheatsheet	Sample
1	Hello World	Print "Hello, World!" to console using syscall.	✅	✅	✅
2	Move Register	Move data between registers using `mov`.	✅	✅	✅
3	Add Numbers	Add two numbers using `add`.	✅	✅	✅
4	Subtract Numbers	Subtract two numbers using `sub`.	✅	✅	✅
5	Multiply Numbers	Multiply two numbers using `imul`.	✅	✅	✅
6	Divide Numbers	Divide two numbers using `idiv`.	✅	✅	✅
7	Compare Numbers	Compare numbers using `cmp`.	✅	✅	✅
8	Conditional Jump	Use `je` for conditional branching.	✅	✅	✅
9	Simple Loop	Implement a loop using `jmp`.	✅	✅	✅
10	Push Pop Stack	Push and pop data on the stack.	✅	✅	✅
11	Exit Program	Exit with a status code using syscall.	✅	✅	✅
12	Define Variable	Define a variable in `.data` section.	✅	✅	✅
13	Print String	Print a string using `write` syscall.	✅	✅	✅
14	Read Input	Read user input from stdin.	✅	✅	✅
15	Bitwise AND	Perform bitwise AND operation.	✅	✅	✅
16	Bitwise OR	Perform bitwise OR operation.	✅	✅	✅
17	Bitwise XOR	Perform bitwise XOR operation.	✅	✅	✅
18	Shift Left	Shift bits left using `shl`.	✅	✅	✅
19	Shift Right	Shift bits right using `shr`.	✅	✅	✅
20	Direct Addressing	Access memory using direct addressing.	✅	✅	✅
21	Indirect Addressing	Access memory using indirect addressing.	✅	✅	✅
22	Indexed Addressing	Access array elements with indexing.	✅	✅	✅
23	Increment Register	Increment a register using `inc`.	✅	✅	✅
24	Decrement Register	Decrement a register using `dec`.	✅	✅	✅
25	Zero Register	Zero a register using `xor`.	✅	✅	✅
26	Flags Register	Check flags after arithmetic operation.	✅	✅	✅
27	Jump Not Equal	Use `jne` for conditional branching.	✅	✅	✅
28	Jump Greater	Use `jg` for conditional branching.	✅	✅	✅
29	Jump Less	Use `jl` for conditional branching.	✅	✅	✅
30	Loop Counter	Loop using `loop` instruction.	✅	✅	✅
31	Print Integer	Convert and print an integer to stdout.	✅	✅	✅
32	Read Integer	Read an integer from stdin.	✅	✅	✅
33	Define Byte	Define a byte variable in `.data`.	✅	✅	✅
34	Define Word	Define a word variable in `.data`.	✅	✅	✅
35	Define Doubleword	Define a doubleword in `.data`.	✅	✅	✅
36	Uninitialized Variable	Define variable in `.bss` section.	✅	✅	✅
37	Move Immediate	Move immediate value to register.	✅	✅	✅
38	Load Effective Address	Use `lea` for address calculation.	✅	✅	✅
39	Negate Number	Negate a number using `neg`.	✅	✅	✅
40	Logical NOT	Perform logical NOT using `not`.	✅	✅	✅
41	Swap Registers	Swap two registers using `xchg`.	✅	✅	✅
42	Test Instruction	Use `test` to check bits.	✅	✅	✅
43	Clear Carry Flag	Clear carry flag using `clc`.	✅	✅	✅
44	Set Carry Flag	Set carry flag using `stc`.	✅	✅	✅
45	Check Zero Flag	Branch based on zero flag.	✅	✅	✅
46	Signed Multiply	Signed multiplication with `imul`.	✅	✅	✅
47	Unsigned Divide	Unsigned division with `div`.	✅	✅	✅
48	Print Newline	Print a newline character.	✅	✅	✅
49	Simple If Else	Implement if-else logic with jumps.	✅	✅	✅
50	Nested Loop	Implement nested loops.	✅	✅	✅
51	Bitwise Rotate Left	Rotate bits left using `rol`.	✅	✅	✅
52	Bitwise Rotate Right	Rotate bits right using `ror`.	✅	✅	✅
53	Print Hex Number	Convert and print number in hex.	✅	✅	✅
54	Read Character	Read a single character from stdin.	✅	✅	✅
55	Stack Alignment	Align stack to 16 bytes.	✅	✅	✅
56	Compare Strings	Compare two strings using `cmpsb`.	✅	✅	✅
57	Move String	Move string using `movsb`.	✅	✅	✅
58	Clear Register	Clear register using `mov`.	✅	✅	✅
59	Check Sign Flag	Branch based on sign flag.	✅	✅	✅
60	Basic Array Sum	Sum elements of an array.	✅	✅	✅
61	Modulo Operation	Compute modulus using `div`.	✅	✅	✅
62	Print Boolean	Print true/false based on condition.	✅	✅	✅
63	Basic Switch Case	Implement switch-case with jumps.	✅	✅	✅
64	Count Bits	Count set bits in a number.	✅	✅	✅
65	Reverse Bits	Reverse bits in a register.	✅	✅	✅
66	Check Parity	Check parity using `test`.	✅	✅	✅
67	Simple Macro	Define a NASM macro for reuse.	✅	✅	✅
68	Print Array	Print elements of an array.	✅	✅	✅
69	Copy Array	Copy array using loop.	✅	✅	✅
70	Find Max	Find maximum in array.	✅	✅	✅
71	Find Min	Find minimum in array.	✅	✅	✅
72	Basic Sort	Simple bubble sort implementation.	✅	✅	✅
73	String Length	Calculate string length.	✅	✅	✅
74	Reverse String	Reverse a string in place.	✅	✅	✅
75	Convert Case	Convert string case (upper/lower).	✅	✅	✅
76	Basic Stack Frame	Set up a basic stack frame.	✅	✅	✅
77	Call Subroutine	Call a subroutine with `call`.	✅	✅	✅
78	Return Value	Return a value from subroutine.	✅	✅	✅
79	Local Variable	Define local variable on stack.	✅	✅	✅
80	Basic While Loop	Implement a while loop.	✅	✅	✅
81	Print Decimal	Print number in decimal format.	✅	✅	✅
82	Read String	Read a string from stdin.	✅	✅	✅
83	Bitwise Shift Variable	Shift a variable’s bits.	✅	✅	✅
84	Check Overflow	Check overflow flag after addition.	✅	✅	✅
85	Simple Array Init	Initialize an array with values.	✅	✅	✅
86	Basic Pointer	Use a pointer to access memory.	✅	✅	✅
87	Swap Variables	Swap two variables in memory.	✅	✅	✅
88	Basic Constant	Define a constant using `equ`.	✅	✅	✅
89	Check Even Odd	Check if a number is even or odd.	✅	✅	✅
90	Print ASCII	Print ASCII character from code.	✅	✅	✅
91	Basic Input Validation	Validate numeric input.	✅	✅	✅
92	Simple Counter	Count from 1 to N.	✅	✅	✅
93	Basic Factorial	Compute factorial iteratively.	✅	✅	✅
94	Fibonacci Sequence	Generate Fibonacci numbers.	✅	✅	✅
95	Array Reverse	Reverse an array in place.	✅	✅	✅
96	String Concat	Concatenate two strings.	✅	✅	✅
97	Basic GCD	Compute GCD of two numbers.	✅	✅	✅
98	Prime Check	Check if a number is prime.	✅	✅	✅
99	Sum Digits	Sum digits of a number.	✅	✅	✅
100	Basic Array Access	Access array elements using indexed addressing.	✅	✅	✅

Intermediate Snippets (101–200)

#	Name	Description	Snippet	Cheatsheet	Sample
101	Function Call	Create and call a function with stack frame.	✅	✅	✅
102	Recursive Factorial	Compute factorial recursively.	✅	✅	✅
103	Call C Function	Call C’s `printf` from assembly.	✅	✅	✅
104	Floating Point Add	Add floating-point numbers using x87 FPU.	✅	✅	✅
105	SSE Vector Add	Perform vector addition with SSE.	✅	✅	✅
106	String Copy	Copy a string using `movsb`.	✅	✅	✅
107	Heap Allocation	Allocate memory using `mmap`.	✅	✅	✅
108	File Write	Write to a file using syscalls.	✅	✅	✅
109	Thread Creation	Create a thread using `clone`.	✅	✅	✅
110	Inline Assembly	Embed assembly in C code.	✅	✅	✅
111	String Compare	Compare strings using `cmpsb`.	✅	✅	✅
112	Array Sort	Implement quicksort for array.	✅	✅	✅
113	Matrix Addition	Add two matrices.	✅	✅	✅
114	Floating Point Multiply	Multiply floats using x87 FPU.	✅	✅	✅
115	SSE Vector Multiply	Multiply vectors with SSE.	✅	✅	✅
116	Dynamic Array	Allocate dynamic array on heap.	✅	✅	✅
117	File Read	Read from a file using syscalls.	✅	✅	✅
118	Function Parameters	Pass multiple parameters to function.	✅	✅	✅
119	Stack Frame Cleanup	Clean up stack after function call.	✅	✅	✅
120	Loop Unrolling	Optimize loop with unrolling.	✅	✅	✅
121	String Tokenize	Split string by delimiter.	✅	✅	✅
122	Struct Access	Access fields in a C-style struct.	✅	✅	✅
123	Matrix Multiply	Multiply two matrices.	✅	✅	✅
124	Recursive Fibonacci	Compute Fibonacci recursively.	✅	✅	✅
125	Binary Search	Implement binary search on array.	✅	✅	✅
126	Linked List Create	Create a linked list node.	✅	✅	✅
127	Linked List Traverse	Traverse a linked list.	✅	✅	✅
128	File Append	Append to a file using syscalls.	✅	✅	✅
129	Mutex Lock	Use mutex for thread synchronization.	✅	✅	✅
130	SSE Matrix Add	Add matrices using SSE instructions.	✅	✅	✅
131	String Search	Search for substring in string.	✅	✅	✅
132	Memory Copy	Copy memory block using `rep movsb`.	✅	✅	✅
133	Floating Point Divide	Divide floats using x87 FPU.	✅	✅	✅
134	Dynamic Stack Alloc	Allocate dynamic space on stack.	✅	✅	✅
135	Function Return Struct	Return a struct from function.	✅	✅	✅
136	Recursive GCD	Compute GCD recursively.	✅	✅	✅
137	Heap Free	Free heap memory using `munmap`.	✅	✅	✅
138	Thread Join	Join a thread using syscalls.	✅	✅	✅
139	Matrix Determinant	Compute matrix determinant.	✅	✅	✅
140	String Replace	Replace characters in a string.	✅	✅	✅
141	Linked List Insert	Insert node in linked list.	✅	✅	✅
142	Linked List Delete	Delete node from linked list.	✅	✅	✅
143	SSE Dot Product	Compute dot product using SSE.	✅	✅	✅
144	File Seek	Seek to position in file.	✅	✅	✅
145	Macro Function	Define a macro for function-like behavior.	✅	✅	✅
146	Array Filter	Filter array based on condition.	✅	✅	✅
147	String Trim	Trim whitespace from string.	✅	✅	✅
148	Floating Point Compare	Compare floats using x87 FPU.	✅	✅	✅
149	Recursive Power	Compute power recursively.	✅	✅	✅
150	Dynamic Matrix	Allocate matrix on heap.	✅	✅	✅
151	Bit Manipulation	Advanced bit manipulation techniques.	✅	✅	✅
152	Array Map	Apply function to array elements.	✅	✅	✅
153	String Format	Format string with placeholders.	✅	✅	✅
154	SSE Matrix Multiply	Multiply matrices using SSE.	✅	✅	✅
155	File Copy	Copy contents of one file to another.	✅	✅	✅
156	Recursive Sum	Sum array recursively.	✅	✅	✅
157	Thread Pool	Implement a simple thread pool.	✅	✅	✅
158	Struct Array	Array of structs in memory.	✅	✅	✅
159	String Parse Int	Parse string to integer.	✅	✅	✅
160	Matrix Inverse	Compute matrix inverse.	✅	✅	✅
161	Linked List Reverse	Reverse a linked list.	✅	✅	✅
162	SSE Vector Normalize	Normalize vector using SSE.	✅	✅	✅
163	File Delete	Delete a file using `unlink`.	✅	✅	✅
164	Recursive Binary Search	Recursive binary search on array.	✅	✅	✅
165	Macro Loop	Use macro for loop generation.	✅	✅	✅
166	String Split	Split string into array of strings.	✅	✅	✅
167	Floating Point Power	Compute power for floats.	✅	✅	✅
168	Heap Realloc	Reallocate heap memory.	✅	✅	✅
169	Thread Synchronization	Synchronize threads with spinlock.	✅	✅	✅
170	Matrix Transpose	Transpose a matrix using loops.	✅	✅	✅
171	Linked List Sort	Sort a linked list.	✅	✅	✅
172	SSE Cross Product	Compute cross product using SSE.	✅	✅	✅
173	File Permissions	Change file permissions using `chmod`.	✅	✅	✅
174	Recursive Merge Sort	Implement merge sort recursively.	✅	✅	✅
175	String To Float	Parse string to floating-point number.	✅	✅	✅
176	Dynamic Struct	Allocate struct on heap.	✅	✅	✅
177	SSE Matrix Inverse	Compute matrix inverse using SSE.	✅	✅	✅
178	File Lock	Lock a file using `flock`.	✅	✅	✅
179	Recursive Tree Traversal	Traverse a binary tree recursively.	✅	✅	✅
180	String Encode	Encode string (e.g., Base64).	✅	✅	✅
181	Linked List Merge	Merge two linked lists.	✅	✅	✅
182	SSE Vector Distance	Compute vector distance using SSE.	✅	✅	✅
183	File Rename	Rename a file using `rename`.	✅	✅	✅
184	Recursive Quick Sort	Implement quicksort recursively.	✅	✅	✅
185	String Decode	Decode string (e.g., Base64).	✅	✅	✅
186	Dynamic Tree Node	Allocate binary tree node on heap.	✅	✅	✅
187	SSE Matrix Determinant	Compute determinant using SSE.	✅	✅	✅
188	File Truncate	Truncate a file using `truncate`.	✅	✅	✅
189	Recursive Factorial Tail	Tail-recursive factorial.	✅	✅	✅
190	String Hash	Compute hash of a string.	✅	✅	✅
191	Linked List Cycle	Detect cycle in linked list.	✅	✅	✅
192	SSE Matrix Transpose	Transpose matrix using SSE.	✅	✅	✅
193	File Stats	Get file stats using `stat`.	✅	✅	✅
194	Recursive Heap Sort	Implement heap sort recursively.	✅	✅	✅
195	String Compress	Compress string using run-length encoding.	✅	✅	✅
196	Dynamic Hash Table	Implement a hash table on heap.	✅	✅	✅
197	SSE Vector Rotate	Rotate vector using SSE.	✅	✅	✅
198	File Monitor	Monitor file changes using `inotify`.	✅	✅	✅
199	Recursive Tree Search	Search binary tree recursively.	✅	✅	✅
200	Matrix Transpose	Transpose a matrix using loops.	✅	✅	✅

Advanced Snippets (201–300)

#	Name	Description	Snippet	Cheatsheet	Sample
201	Simple Bootloader	Write a minimal bootloader.	✅	✅	✅
202	Kernel Module	Create a Linux kernel module.	✅	✅	✅
203	Interrupt Handler	Set up an interrupt handler.	✅	✅	✅
204	Memory Allocator	Implement a simple heap allocator.	✅	✅	✅
205	Port IO	Read/write to hardware ports.	✅	✅	✅
206	Disassemble Binary	Disassemble a binary with `objdump`.	✅	✅	✅
207	Self Modifying Code	Write self-modifying code.	✅	✅	✅
208	AES Encryption	Implement AES encryption.	✅	✅	✅
209	Shellcode Spawn	Write shellcode to spawn a shell.	✅	✅	✅
210	Custom ISA Emulator	Emulate a toy instruction set.	✅	✅	✅
211	VGA Graphics	Draw pixels in VGA mode.	❌	❌	❌
212	Kernel Syscall	Implement custom syscall in kernel.	❌	❌	❌
213	IDT Setup	Set up Interrupt Descriptor Table.	❌	❌	❌
214	Page Table	Configure a page table.	❌	❌	❌
215	Device Driver	Write a simple device driver.	❌	❌	❌
216	Code Obfuscation	Obfuscate code with jump table.	❌	❌	❌
217	SHA Hash	Implement SHA-256 hash.	❌	❌	❌
218	Shellcode Reverse Shell	Shellcode for reverse shell.	❌	❌	❌
219	AVX Vector Add	Vector addition using AVX.	❌	❌	❌
220	Simple OS Kernel	Minimal OS kernel with boot.	❌	❌	❌
221	Memory Protection	Set memory protection with `mprotect`.	❌	❌	❌
222	Keyboard Interrupt	Handle keyboard interrupt.	❌	❌	❌
223	Custom Allocator	Advanced custom memory allocator.	❌	❌	❌
224	GPU Shader	Write a simple GPU shader.	❌	❌	❌
225	Reverse Engineer Loop	Reverse engineer a loop construct.	❌	❌	❌
226	RSA Encryption	Implement RSA encryption.	❌	❌	❌
227	Shellcode Inject	Inject shellcode into process.	❌	❌	❌
228	AVX Matrix Multiply	Matrix multiply using AVX.	❌	❌	❌
229	Simple File System	Implement a basic file system.	❌	❌	❌
230	Timer Interrupt	Handle timer interrupt.	❌	❌	❌
231	Memory Cache Optimize	Optimize code for cache efficiency.	❌	❌	❌
232	Network Socket	Create a TCP socket.	❌	❌	❌
233	Code Polymorphism	Write polymorphic code.	❌	❌	❌
234	SHA512 Hash	Implement SHA-512 hash.	❌	❌	❌
235	Shellcode Bind Shell	Shellcode for bind shell.	❌	❌	❌
236	AVX Vector Normalize	Normalize vector using AVX.	❌	❌	❌
237	Task Scheduler	Implement a simple task scheduler.	❌	❌	❌
238	Page Fault Handler	Handle page faults in kernel.	❌	❌	❌
239	Memory Compression	Compress memory block.	❌	❌	❌
240	Network Packet	Craft a network packet.	❌	❌	❌
241	Anti Debugging	Implement anti-debugging techniques.	❌	❌	❌
242	ECDSA Signature	Implement ECDSA signature.	❌	❌	❌
243	Shellcode Stealth	Write stealthy shellcode.	❌	❌	❌
244	AVX Matrix Inverse	Compute matrix inverse using AVX.	❌	❌	❌
245	Process Fork	Fork a process using syscall.	❌	❌	❌
246	Exception Handler	Handle exceptions in kernel.	❌	❌	❌
247	Memory Encryption	Encrypt memory block.	❌	❌	❌
248	Network Server	Implement a simple TCP server.	❌	❌	❌
249	Code Encryption	Encrypt code section.	❌	❌	❌
250	AVX Dot Product	Compute dot product using AVX.	❌	❌	❌
251	Virtual Machine	Implement a simple VM.	❌	❌	❌
252	Signal Handler	Handle signals using `sigaction`.	❌	❌	❌
253	Memory Alignment	Align memory for performance.	❌	❌	❌
254	Network Client	Implement a TCP client.	❌	❌	❌
255	Code Packing	Pack code for size optimization.	❌	❌	❌
256	AVX Cross Product	Compute cross product using AVX.	❌	❌	❌
257	Process Injection	Inject code into running process.	❌	❌	❌
258	Memory Paging	Implement basic paging.	❌	❌	❌
259	Crypto Hash	Implement a custom crypto hash.	❌	❌	❌
260	Shellcode Loader	Load and execute shellcode.	❌	❌	❌
261	Real Time Interrupt	Handle real-time interrupts.	❌	❌	❌
262	Memory Decompression	Decompress memory block.	❌	❌	❌
263	Network Sniffer	Sniff network packets.	❌	❌	❌
264	Code Anti Analysis	Anti-analysis techniques for code.	❌	❌	❌
265	AVX Matrix Determinant	Compute determinant using AVX.	❌	❌	❌
266	Process Monitor	Monitor process creation.	❌	❌	❌
267	Memory Snapshot	Take snapshot of memory state.	❌	❌	❌
268	Network Broadcast	Send broadcast packet.	❌	❌	❌
269	Code Self Decrypt	Self-decrypting code.	❌	❌	❌
270	AVX Vector Distance	Compute vector distance using AVX.	❌	❌	❌
271	Thread Scheduler	Implement thread scheduler.	❌	❌	❌
272	Memory Virtualization	Virtualize memory access.	❌	❌	❌
273	Crypto Stream Cipher	Implement stream cipher.	❌	❌	❌
274	Shellcode Obfuscation	Obfuscate shellcode.	❌	❌	❌
275	AVX Matrix Transpose	Transpose matrix using AVX.	❌	❌	❌
276	Process Fork Exec	Fork and exec a process.	❌	❌	❌
277	Memory Tracing	Trace memory accesses.	❌	❌	❌
278	Network UDP	Implement UDP communication.	❌	❌	❌
279	Code Anti Tamper	Implement anti-tamper mechanisms.	❌	❌	❌
280	AVX Vector Rotate	Rotate vector using AVX.	❌	❌	❌
281	Kernel Thread	Create kernel thread.	❌	❌	❌
282	Memory Sandbox	Implement memory sandbox.	❌	❌	❌
283	Crypto Block Cipher	Implement block cipher.	❌	❌	❌
284	Shellcode Anti Debug	Shellcode with anti-debugging.	❌	❌	❌
285	AVX Matrix Solve	Solve matrix system using AVX.	❌	❌	❌
286	Process Hooking	Hook a process function.	❌	❌	❌
287	Memory Forensics	Analyze memory for forensics.	❌	❌	❌
288	Network Firewall	Implement basic firewall rules.	❌	❌	❌
289	Code Signing	Implement code signing.	❌	❌	❌
290	AVX Vector Transform	Transform vector using AVX.	❌	❌	❌
291	Kernel Debug	Debug kernel with breakpoints.	❌	❌	❌
292	Memory Isolation	Isolate memory regions.	❌	❌	❌
293	Crypto Key Exchange	Implement key exchange.	❌	❌	❌
294	Shellcode Persistence	Persistent shellcode execution.	❌	❌	❌
295	AVX Matrix Eigen	Compute eigenvalues using AVX.	❌	❌	❌
296	Process Migration	Migrate process to another CPU.	❌	❌	❌
297	Memory Encryption AES	Encrypt memory with AES.	❌	❌	❌
298	Network Protocol	Implement custom protocol.	❌	❌	❌
299	Code Virtualization	Virtualize code execution.	❌	❌	❌
300	Shellcode Execve	Shellcode to execute a program.	❌	❌	❌