Back in 1984, I wanted to write a Z80 assembler. At the time, this would have meant coding it in Z80 machine code, but due to the conveniences of modern technology, I have now done it in C++.

assembler

C++

PolyHook 2: C++17 x86/x64 Hooking Library

24 Jul 2018 by stevemk14ebr

PolyHook v2 - the C++17 x86/x64 library supporting multiple methods of hooking

DMath is DirectXMath for All

5 Mar 2017 by Jose A Pascoa

Part 1 - Using DMath from C#

Direct X and Pure Assembly Language: Doing What Can't be Done - Part II

14 Jun 2017 by CMalcheski

Part II - Laying the Foundation for the Migration to Assembly

The Kernel-Bridge Framework

1 Nov 2018 by Alexander Eremeev

The Windows kernel-hacking library and development framework written on C++17

A 2D List Implementation in MASM Assembly

27 Feb 2016 by John Jiyang Hou

A List data structure implementation in MASM Assembly with C function realloc

Basic x86-64bit Buffer Overflows in Linux

30 Aug 2019 by Oscar-Tark

If you are looking into white hat hacking, it's good to know old school tactics used for overflows.

Perl

assembler

Fast Integer Square Root For 8051

28 Dec 2020 by CPallini

Fast integer square root computation in 8051 assembly

Integer Square Root on 15 Assembler Lines

5 Jun 2019 by altomaltes

This code calculates square root of an integer on a few assembler code lines.

Storage Sizes and Other Useful Properties: Windows, C++, and C Variable Types

28 Jun 2016 by David A. Gray

A reference chart that doubles as the engine behind a data structure mapper

DirectX and Pure Assembly Language: Doing What Can't be Done - Part IV(a)

15 Sep 2017 by CMalcheski

Initializing DirectX

Building MS-DOS 1.25

15 Feb 2024 by Jonathan Chapman-Moore

How to build Microsoft Disk Operating System 1.25

MASM

assembler

ASM

assembly IDE & compiler

22 Nov 2015 by OriginalGriff

Assembly language doesn't use a compiler - only high level languages need that. Assembly language is processed to machine code via an assembler, which is a different type of program altogether.And this isn't a question we can answer: each assembler is specific to a processor type - or even...

assembler

compiler

IDE

Advanced Behaviours Design Pattern in Automated Testing - Part 1

15 May 2016 by Anton Angelov

Describes how to improve even further the behaviours design pattern tests through new base classes and usage of Unity IoC container.

SourceTree Issue: This is Not a Valid Working Copy Path

30 Nov 2016 by Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)

We will discuss a quick tip to resolve the SourceTree issue mentioned in the title.

assembler

source-control

Git

Embedded Programming using Powerbasic with RTOS-32 (Part 1)

12 Sep 2018 by Chris Boss

A short introduction to using the Powerbasic 6.0 console compiler with the Ontime RTOS-32 embedded operating system

Is there a 96-bit datatype in C++ like .NET's system.decimal?

26 Oct 2020 by OriginalGriff

Yes it can be done: just because something isn't directly supported by the processor doesn't mean you can't use it in assembler - think about a BigInt value where each decimal digit is stored in a nibble - so two digits fit in a byte - and an...

MSIL

assembler

C++

Is there a 96-bit datatype in C++ like .NET's system.decimal?

26 Oct 2020 by KarstenK

There is support in some C++ libraries like Boost for that. Some compilers are not handling exact sizes for data types, but are using alignment. The advantage is that full bytes are used and so the processing speed is better, because no efforts...

MSIL

assembler

C++

Find the equivalent MIPS assembly code for the C program as follows

15 Sep 2021 by Richard MacCutchan

Multiplication and Division in MIPS Assembly Language[^]

assembler

Intel

How do I figure out if the data in a variable is a word or a byte in C++?

21 Jun 2015 by CPallini

If you meant 'How could I establish if an int value would fit in a byte?' then the answer is yes, you may do it. A simple approach could be the round-trip:unsigned int a = 0xDEADBEEF; // see the nvr3 commentbool fit_in_a_byte = (a == static_cast(a));

assembler

C++

Windows

How do I figure out if the data in a variable is a word or a byte in C++?

19 Jul 2015 by Frankie-C

OK now it makes a little bit more sense.To write an assembler is not such an easy task, at least to encode correct machine code.In some cases even if a full specified instruction is present there could be more than one legal encoding.Anyway going back to your question consider that in...

assembler

C++

Windows

How do I add two numbers and also return the result in number in assembly?

24 Jun 2015 by CPallini

In order to output the number 11 to the display you have to call the interrupt 21h two times, providing the character '1' (that is the value 31h) as dl argument.Generally speaking, in order to ouput (in decimal representation) the content of a 8bit register you have to:divide (integer...

ASM

assembler

C++

Where is the nativewifi reference?

24 Aug 2015 by Dave Kreskowiak

There is no assembly to add a reference to. NativeWifi is part of Windows and accessible through P/Invoking the various functions. There is no assembly in the .NET Framework that wraps that functionality.There is, however, a third party wrapper you can use here[^], though it hasn't been...

I am trying to use the ELSE IF command in QBASIC?

24 Sep 2016 by OriginalGriff

Look at your IF:IF num1 > num2 AND num3 THENThat doesn't do what you think it does!You think it means "if number one is the greatest of the three numbers" - it doesn't. The AND breaks it into two separate conditions and insists that both must be true: So "if number one is greater than number...

Basic

assembler

Multiple Precision Arithmetic: A Recreational Project

11 Jun 2022 by Andrea Simonassi

Showing algorithms and code used on this article series

Javascript

assembler

Find the equivalent MIPS assembly code for the C program as follows

15 Sep 2021 by CPallini

Note, you don't have to use the multiplication. You know, the left shift...

assembler

Intel

How can I correct this code?

2 Oct 2022 by Richard MacCutchan

Do you see something wrong here? MOV AL, NUM1 MOV AL, NUM2 MOV SOMMA, AL And at that point both NUM1 and NUM2 are characters, and not numeric values. So the first thing you need to do is convert each number to its integer equivalent. So...

assembler

programming

Visual studio code and ZMAC configuration

9 Nov 2023 by Andre Oosthuizen

Hi Mike, great to see you on the Q&A side of the world for a change :)... I am not at all familiar with ZMAC at all and took the "easy but stupid" way out, sometimes it helps, sometimes it is a waste of time, your choice to try it - I have asked...

assembler

Calculate code density and memory traffic for assembly code

14 Jan 2024 by merano99

Quote: Opcodes are 1 byte, except push/pop operations which are 2 bits. The increase in memory traffic caused by an instruction that addresses a memory location depends on the size of the memory address. In the task, it was specified that the...

assembler

Please help me understand this....

9 Jul 2015 by OriginalGriff

"how do you store a 11 byte data into 1 byte memory?":laugh:You don't.db allocates bytes, not just a byte - so if you use msg db 'Hello, world!',0xathen it will allocate an area for an fourteen character string with the data filled in, not a single byte. The label msg will contain...

assembler

x86

Please help me understand this....

9 Jul 2015 by F-ES Sitecore

msg db "ABC"the above places "ABC" at that memory address and that memory address is labelled as "msg". So if my code is at memory address 10000 then the following assemblymsg db "ABC"NOPwill result in10000 A10002 B10004 C10006 00 (00 being the NOP)Memory address...

assembler

x86

Arm assembly programming

2 Sep 2015 by Richard MacCutchan

Assuming from your question you do not have a copy of a reference manual, you can find the answers quite easily by following: https://www.google.com/search?q=arm+assembly[^].

assembler

ARM

how can do floor and ceil function in MIPS assembly?

30 Oct 2015 by Jochen Arndt

You should definitely get some copy of the MIPS instruction set reference. Even without that I was able to find the instructions floor.s and ceil.s using Google. However, these are only supported with newer MIPS CPUs. But you can also do it the hard way by adding or subtracting 0.5 (depening...

assembler

Book about programming from the bottom up

10 Nov 2015 by Leo Chapiro

Take a look at this very nice free PDF (under the terms of the GNU FreeDocumentation License) from Jonathan Bartlett:Programming from the Ground Up

assembler

Book about programming from the bottom up

10 Nov 2015 by Patrice T

The dragon book may be of interests to you too.https://en.wikipedia.org/wiki/Compilers:_Principles,_Techniques,_and_Tools[^]

assembler

I have to write an assembly language project.Do you have an idea?

24 Dec 2015 by Andreas Gieriet

A simple task scheduler?A memory pool memory manager?A fixed-point arithmetic library, e.g. for add/sub/mul/div?A device driver for an SPI connected device?...CheersAndi

assembler

Why the build assembly source in nasm don't work in win 7?

4 Mar 2016 by Richard MacCutchan

You cannot create a .com program directly from the assembler (including the fact that the source does not support it). The output should have a .exe extension.

Why the build assembly source in nasm don't work in win 7?

4 Mar 2016 by stackprogramer

i had a silly wrong!!i completed answer my friend after thinking i concluded that int 0x80 is not in windows, it should be for linux.Richard MacCutchan thanks very much.cordially your stackprogramer

OFFSET operator in assembly x86 processors

10 Jun 2016 by E.F. Nijboer

The difference is between using the value directly or from memory address.mov esi, OFFSET byteValHere the address of byteVal will be put into register esi (assume 00404000 as in the example)mov al, [esi] ; AL = 10hHere the esi is put between brackets, like [esi], meaning not to use...

assembler

Reversing elements of an array assembly

11 Jun 2016 by Patrice T

First of all, you can simplify your codereverseLoop: mov eax, [esi] ;move the element in esi to eax mov ebx, [edi] ;move the element in edi to ebx xchg eax, ebx ;exchange the two elements mov [esi], eax ;move the element in eax, to the address in esi mov [edi], ebx ...

assembler

Asm expression misunderstanding with times

3 Aug 2016 by Richard MacCutchan

buffer: db 'hello, world'times 64-$+buffer db '_'Assume the location of buffer is 1000, then the location of times (identified by the $ sign) is 1012.So:64 - 1012 = -948-948 + 1000 = 52The expression effectively calculates the number of dashes to add to the previous string to...

What is different bewteen PE and IL code in C# compilation?

16 Aug 2016 by Richard MacCutchan

Portable Executable - Wikipedia, the free encyclopedia[^].Managed Execution Process[^].

Learning qbasic and im trying to understand the code I just wrote

26 Sep 2016 by Garth J Lancaster

I would have started on a piece of paper, since you only have 3 variables, LINES, X, YI'm going to use a notation a

Basic

assembler

Print sign in assembly

13 Mar 2017 by Kornfeld Eliyahu Peter

To print a character using BIOS interrupt 10h, you first have to set the function in AH...mov ah, 0x0emov al, '-'int 0x10If you wish us to examine your code, please paste it in to your question instead of adding a link...

assembler

NASM

How to implement a simple 4 functions calculator for 3 digits entry

31 May 2017 by Patrice T

We do not do your HomeWork. HomeWork is not set to test your skills at begging other people to do your work, it is set to make you think and to help your teacher to check your understanding of the courses you have taken and also the problems you have at applying them. Any failure of you will...

assembler

Need a help............

11 Jun 2017 by OriginalGriff

Quote: I need a help. ... blah, blah, homework question copy'n'pasted in, blah, blah ... I need this code We do not do your homework: it is set for a reason. It is there so that you think about what you have been told, and try to understand it. It is also there so that your tutor can identify...

assembler

Multiple Precision Arithmetic: Sum Algorithm

11 Jun 2022 by Andrea Simonassi

The simplest multiple precision sum algorithm

How to calulate the avg in assembly language 8086?

13 Dec 2017 by Jochen Arndt

That depends on the type of data (bit width with integers or single/double precision floating point values) and if overflow can occur and should be handled. For 16-bit int with no overflow detection and array address in ds:si: [EDIT: Fixed wrong offsets] AvgLoop: ; Check for end of...

assembler

ASM

AVG

X86 assembly sorting problem

16 May 2018 by OriginalGriff

We do not do your homework: it is set for a reason. It is there so that you think about what you have been told, and try to understand it. It is also there so that your tutor can identify areas where you are weak, and focus more attention on remedial action. And 3 lines of C code does not count...

assembler

NASM

x86

X86 assembly sorting problem

16 May 2018 by Patrice T

Quote: X86 assembly sorting problem What problem do you have on this HomeWork ? We do not do your HomeWork. HomeWork is not set to test your skills at begging other people to do your work, it is set to make you think and to help your teacher to check your understanding of the courses you have...

assembler

NASM

x86

MIPS – why does the following print “OK”?

3 Dec 2018 by CPallini

Quote: I expected the register $v0 to store 32 (11 + 11 + 10) and $a0 to store 154 (79 + 75). Your assumptions are wrong. addi $v0, $zero, 11 could be written (pseudocode) v0

assembler

C to assembly language program for MARS 4.5 program ONLY

20 Mar 2019 by Dave Kreskowiak

We're not here to do your homework for you.

assembler

Interrupt in assembly language

23 Apr 2019 by OriginalGriff

We are more than willing to help those that are stuck: but that doesn't mean that we are here to do it all for you! We can't do all the work, you are either getting paid for this, or it's part of your grades and it wouldn't be at all fair for us to do it all for you. So we need you to do the...

assembler

microcontroller

How does one convert assembly code to C/C++ code?

13 Aug 2019 by Stefan_Lang

The problem is that when you use any form of automatic conversion, the resulting code cannot be magically more readable than before. It requires hard work and good analysis to understand what the data structures are, recognize patterns in the algorithms and subroutines, and derive the general...

assembler

C++

decompiling

Conversion of one language to another

13 Aug 2019 by Patrice T

Quote: but i could not seem to find the syntax. i tried but i always get an error. Advice: Never do this, not like that! The code in your comment show that you do not understand what you do, and it is a good thing that you get errors. This piece of code: 0x00401410 : push %ebp...

C++14

assembler

compiler

Hi this is assembly language MASM please explain

18 Nov 2019 by OriginalGriff

assembler

Hi this is assembly language MASM please explain

18 Nov 2019 by CPallini

Have a look, for instance, at MASM - Arrays - Other Language Tutorials | Dream.In.Code[^].

assembler

Using asmjit, how can I copy a byte in an exe and run it as a function in another?

5 Mar 2020 by Richard MacCutchan

There are links at GitHub - asmjit/asmjit: Complete x86/x64 JIT and AOT Assembler for C++[^] to the blog and chat spaces, so you would probably get better information there.

ASM

C++14

assembler

Linking error: "int_cded..." already defined in main.obj

13 Apr 2020 by Rick York

The problem is you are including source code files. Those are supposed to be compiled separately and then linked together. The error is because the source files included, EncryptData_Initial.cpp and DecryptData_Initial.cpp, are likely to also...

assembler

errors

Calculator emu8086 assembly

5 May 2020 by CPallini

You know we will not do your homework for you. The right approach is: try (harder) yourself and post here only specific questions.

assembler

Is there a 96-bit datatype in C++ like .NET's system.decimal?

26 Oct 2020 by deXo-fan

Hello, Well, the title of this question is perhaps self explanatory, but at the same time I already know the answer to that question is "No". So allow me to elaborate my question and goal a bit. There used to be a 12-byte integer type in C++ a...

MSIL

assembler

C++

Is there a 96-bit datatype in C++ like .NET's system.decimal?

26 Oct 2020 by Patrice T

Quote: There used to be a 12-byte integer type in C++ a few years back, at least in Microsoft's compiler. But even then that didn't make sense, because as you know, C++ is converted to Assembly code, and the two largest integer types in Assembly...

MSIL

assembler

C++

I need an example of assambly code 8086 .exe

9 Nov 2020 by Sandeep Mewara

Quote: I tried to search on internet but i couldn't find examples Not sure what you searched for. Didn't knew something like this was there and thus googled out of curiosity. Example: 8086 program to find the factorial of a number -...

assembler

How do I move a “sprite” in MIPS assembly code using mars?

10 Nov 2020 by CPallini

As mentioned in the requirements, you have to use nested loops. Try, for instance .data InArr: .word 0x0eeeeeee 0xeeeeeeee 0xeeeeeeee 0xeeeeeeee 0xeeeeeeee 0xeeeeeeee 0xeeeeeeee 0xeeeeeeee .text .globl main main: li $s4, 8 # outer loop...

assembler

Can anyone convert this code from C to mips?

4 Jan 2021 by Dave Kreskowiak

This is not a code conversion service. You have to do the work yourself. It looks like you're going to have to learn MIPS assembly language.

assembler

microservice

Help for this question I tried to answers this for days

12 Jul 2021 by OriginalGriff

While we are more than willing to help those that are stuck, that doesn't mean that we are here to do it all for you! We can't do all the work, you are either getting paid for this, or it's part of your grades and it wouldn't be at all fair for...

Convert a = 0 command to MIPS assembly

23 Oct 2021 by OriginalGriff

Or just lw $s2, $zero Which avoids any arithmetic at all.

assembler

C# - external ASM code breaks when run asynchronously

10 Dec 2021 by Richard Deeming

As I suspected, the problem is that your unmanaged code is running outside of the fixed blocks, so the CLR is free to move the memory around. The pointer you pass in will be pointing to the wrong thing. Since you can't await inside a fixed...

ASM

assembler

asynchronous

How do I convert my arduino code into assembly code? I have to use it for my project, I have to use atmel studio 7.

27 Jan 2022 by OriginalGriff

This is not a code conversion service: we are not here to translate code for you. Even if we did, what you would end up with would not be "good code" in the target language – they are based on very different frameworks, and what makes something...

assembler

C++

Arduino

How do I convert my arduino code into assembly code? I have to use it for my project, I have to use atmel studio 7.

27 Jan 2022 by CPallini

For such a task you clearly don't need assembly at all, so, I assume it is homework. In order to fulfill it, you should first gain knowledge of the assembly language featured by your own arduino board (probably AVR, see: AVR Instruction Set...

assembler

C++

Arduino

Partial Sum of Binomial Coefficients

26 Oct 2023 by Tasos Kipriotis

A quicker way to calculate the partial sum of binomial coefficients

assembler

Calculate expression in assembler

5 Jan 2024 by OriginalGriff

assembler

Calculate expression in assembler

6 Jan 2024 by Mike-MadBadger

Given that you already have a partial answer to the three address machine case then this is what I would expect from you (adapted for the processor architecture in question) : LOAD A, R1 LOAD B, R2 ADD R1, R2, R3 MUL R3, R3, R4 LOAD C, R5 MUL...

assembler

How div and sub works on a stack based processor 0 address machine

6 Jan 2024 by OriginalGriff

We can't tell you: there is no generic law that states that an imaginary stack-based machine must use operands in any specific order: either order is possible, and it will depend on the way the stack machine was defined: though generally speaking...

assembler

Calculate code density and memory traffic for assembly code

12 Jan 2024 by OriginalGriff

assembler

hmm assembly program that raises one user input to the power of the next user input

9 Apr 2015 by Member 11591622

I am trying to write a program that takes two non-negative numbers from the user and raises the first input to the power of the second input. I am struggling a bit with this problem...but I have worked out some, unfinished code:Power = """00 read r1 #get n01 read r2 #get...

assembler

hmm assembly program that raises one user input to the power of the next user input

9 Apr 2015 by BacchusBeale

One algorithm would be get integers A and B.make power be P=1while A is not zeroP= P times BA = A - 1print P

assembler

80x86 Assembly on linux

28 Apr 2015 by Sergey Alexandrovich Kryukov

It is not possible to execute arbitrary 8086 code on Linux, you would need a virtual machine with simulation of some real-mode system, such as DOS, as a guest OS. This is not a question; there is nothing reasonable in this post. Of course, you can use assembler itself on Linux:...

assembler

Linux

how to write code in assembly language for creating and moving a circle?

27 May 2015 by OriginalGriff

"The question I asked is an assignment question of Computer Graphics course but I'm unable to answer it due to not knowing Assembly language.""In our class We have been taught C and then Assembly languages. But I didn't learn it"So...you didn't bother and now you want us to pull your...

assembler

How do I print the output after adding two number in assembly

11 Jun 2015 by rudy-peto

I am trying to add two number, because of the adding result is in ASCII, I added 'AAA' to correct the result, but i can't print the result which is store in AL on screen because I need Interrupt 21-service 9 to print. Then I copy AX to DX, but it doesn't work.. What's wrong?ORG 100hMOV...

assembler

How do I print the output after adding two number in assembly

11 Jun 2015 by Richard MacCutchan

You do not have a string reference in DX; you should be using service 02h as described at http://spike.scu.edu.au/~barry/interrupts.html#ah02[^].

assembler

How do I add two numbers and also return the result in number in assembly?

24 Jun 2015 by rudy-peto

Hi! I need to add two numbers and return the result in number (decimal) not hex or binary or char. I am using emulator8086.I've done something like this:org 100hmov al,6mov bl,5add al,blmov dl,almov ah,02hint 21hint 20hThe result is in a character. Then how do I get an...

ASM

assembler

C++

Where is the nativewifi reference?

24 Aug 2015 by Coder1999

Hello. I can't find where the Nativewifi reference is in visual studio. Does someone know what reference NativeWifi is part of?

Arm data abort exception handler running in the task context?

8 Sep 2015 by chandrAN2&

I am working on a ARM xscale board, where for data abort exception there is an exception handler which is getting executed in the task context. Is this correct?whenever an abort happens,cpu will switch to Abort mode and use a separate stack and the handler will be executed in context similar...

assembler

ARM

How to declare string variable in assembly

29 Oct 2015 by Jochen Arndt

Declare a data storage reserving the amount of memory (max. string length). You did not specify the assembler you are using but according to http://logos.cs.uic.edu/366/notes/mips%20quick%20tutorial.htm[^] it might be: .datastring1: .space 40 # max. length for string1...

assembler

How to declare string variable in assembly

29 Oct 2015 by Richard MacCutchan

See http://www.cs.umd.edu/class/sum2003/cmsc311/Notes/Mips/dataseg.html[^], or the documentation for whichever assembler you are using.

assembler

how can do float multiplication in assembly?

30 Oct 2015 by amin.j

I want to write this code: y= 0.4*x+1 but I have some errors in MIPS assembly[Edit - Added from comment]I have an integer value in register $t1 and I want to multiply it with 0.4 but it has error in the second line:li.s $f0, 0.4mul.d $f1, $f0, $t1mfhi...

assembler

how can do floor and ceil function in MIPS assembly?

30 Oct 2015 by amin.j

I would like to ask how I can do floor and ceil functions in MIPS assembly??

assembler

i wanna program an 8086 assembly

11 Dec 2015 by OriginalGriff

assembler