Questions tagged [amd64]
amd64 (also "x86-64") is the 64-bit version of the x86 instruction set.
12
questions
3
votes
2
answers
89
views
Functions to simplify printing strings and numbers in amd64 Assembly
I'm new to Assembly, and this is my very first "project" in Assembly. I wanted to store data (numbers) on the stack, then access and display them. Eventually, this "experiment" of ...
- 31
3
votes
1
answer
124
views
`strdup` re-implementation in assembly
I am posting a message here because I am new to assembly programming. My goal today was to re-code strdup in assembly, so to save my first parameter which is a ...
- 31
11
votes
3
answers
2k
views
Remove leading zeroes from the beginning of a string
I want to remove leading zeroes (for a big integer library I'm currently making) in numbers represented as char arrays.
I chose assembly for speed, but in order to simplify making the algorithm and ...
- 309
2
votes
1
answer
248
views
Increment a binary number represented as a string
I'm an amateur at assembly, but am trying to get better at it. For fun, I decided to write code that takes in a char array and increments the number represented in binary.
Here are a few input-output ...
- 309
1
vote
1
answer
678
views
"Hello world" in x64 assembly for Windows - Shadow space / Stack alignment
I`m currently trying to delve into x64 assembly under windows using NASM, and created a minimalistic "Hello World" application.
It is mainly meant as an educational resource for me and ...
- 78
0
votes
1
answer
2k
views
Writing a recursive factorial function in x86-64
The following assembly program works to print the factorial of a number:
...
- 409
4
votes
1
answer
121
views
Trivial string-reverser in MASM64
I've been learning MASM64 over the last few days and written a simple demo, so I can get feedback on my understanding of x64 assembly programming.
It's really basic: it asks the user for their name, ...
- 143
5
votes
1
answer
111
views
An echo program, mostly in C and completely from scratch
This is an echo program with no runtime or standard library. It's meant to be compiled with -nostdlib on an amd64 Linux system.
...
6
votes
1
answer
224
views
Cat program in x64 FASM
I wrote cat program in x64 FASM and I would like to know if there is anything that can be improved.
This implementation of cat supports:
Reading from stdin.
Multiple arguments.
I checked few cases ...
- 525
3
votes
3
answers
428
views
A simple shellcode that will kill all your processes GNU/Linux x86_64
So I made a simple shellcode that will kill all your process.
Now I would like to know, can it be done in some better way?
It contains 13 bytes. Thanks for all your feedback
Assembly:
...
- 39
2
votes
0
answers
485
views
x64 Windows Assembly - Structs in Assembly
I'm trying to code a simple person database using structs and arrays in assembly.
Each person has a firstName, lastName, ...
- 21
2
votes
1
answer
171
views
Routine to convert decimal digits to Densely Packed Decimal
I've written an amd64 assembly routine (in gas syntax using the System V calling convention) to convert three decimal digits to Densely packed decimal because I wasn't satisfied by the performance of ...
- 641