Assembly 300 Snippets

Current Repository Progress:

• Snippets: 180/300
• Cheatsheets: 180/300
• Samples: 180/300

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.

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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.	❌	❌	❌