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ASSEMBLY QUESTIONS

Assembly - trying to write to file but access denied

Assembly - trying to write to file but access denied

wish of those help I have a file which I need to write to from a "Buffer" in Data Segment, but when I try to write to the file with the DOS interrupt 21h 40h, it sets the Carry flag to 1, and the ax to 05 - which means access denied, what to do , Whe

Date : January 12 2021, 09:11 PM , By : KS9

Why do I get triple fault when trying to handle an exception on 286 but not on a modern CPU nor Bochs?

Why do I get triple fault when trying to handle an exception on 286 but not on a modern CPU nor Bochs?

it helps some times I'm trying to initialize protected mode with exception handling on an AMD 286 system. I've debugged the code below on Bochs, and it works fine there. So does it when run on a Pentium 4 machine. But on the 286 it simply triple faul

Date : January 11 2021, 05:14 PM , By : SilverRuby

MIPS assembly: big and little endian confusion

MIPS assembly: big and little endian confusion

hop of those help? It would be the same -- the order of the bytes in memory would be different, but you would only see that if you loaded single bytes from 200($t1), 201($t1), 202($t1) and 203($t1)

Date : January 10 2021, 01:47 PM , By : user158220

Messing with the stack in assembly and c++

Messing with the stack in assembly and c++

I hope this helps you . The following code excerpts have been checked with mingw-g++, but should work in VC++ with minor modifications. The full sources are available from Launchpad: 1The only way we can safely save call-specific data is to store it

Date : January 10 2021, 01:47 PM , By : msugar

Reading a string in TASM x86 assembly

Reading a string in TASM x86 assembly

like below fixes the issue The DB (define byte) directive is used to allocate byte-sized blocks of memory. The section that comes after the DB specifies the value that should be placed into the allocated memory. For example, if you wanted to define a

Date : January 10 2021, 01:45 PM , By : boney M

Is CMOVcc considered a branching instruction?

Is CMOVcc considered a branching instruction?

Hope that helps No, it's not a branch, that's the whole point of cmovcc.It's an ALU select that has a data dependency on both inputs, not a control dependency. (With a memory source, it unconditionally loads the memory source, unlike ARM predicated l

Date : January 09 2021, 02:14 PM , By : user184406

Why mov ax, [[num] + val] isn't the same as breaking it to instructions

Why mov ax, [[num] + val] isn't the same as breaking it to instructions

will help you Because assembler is different to most of the other programming languages.Most of the PLs are aiming for generalization and universal usage of their syntax, as building blocks, to compose expressions way beyond trivial syntax of particu

Date : January 09 2021, 05:38 AM , By : ranja

.set label, . Vs. label: GNU AS

.set label, . Vs. label: GNU AS

wish of those help Very interesting question. I've never seen anyone do this before. In short, yes, they are a little different. Here are a couple cases:Local labels

Date : January 02 2021, 06:48 AM , By : browe

String printer doesn't print newlines

String printer doesn't print newlines

it should still fix some issue As mentioned in the comments, you should zero-terminate the newLine message.

Date : January 02 2021, 06:48 AM , By : arbeitandy

Why do I get another result?

Why do I get another result?

will help you The .start directive will produce code that will initialize the segments for the model you have chosen (in this case small). You overwrite DS with whatever happens to be in AX with mov ds, ax. That will point the data segment to a place

Date : January 02 2021, 06:48 AM , By : user184406

I want to convert x86 Linux shellcode with system calls to ARM Linux system calls

I want to convert x86 Linux shellcode with system calls to ARM Linux system calls

hop of those help? I want to convert Intel x86 assembly code to ARM. I do not know how to use the stack. , man syscall

Date : January 02 2021, 06:48 AM , By : Kocur

Finding first and last capital letter in user input

Finding first and last capital letter in user input

will help you Input is to be taken from a-z or A-Z and the input is ended by an asterisk *. , First ask yourself these questions: What are capitals?

Date : January 02 2021, 06:48 AM , By : dormsbee

Which 2 cases aren't solved with this code?

Which 2 cases aren't solved with this code?

hope this fix your issue In the example that is written with the Hebrew version,my teacher wrote that the sequence appears twice.

Date : January 02 2021, 06:48 AM , By : dexteryy

8086 assembly register indirect MOV instruction

8086 assembly register indirect MOV instruction

I hope this helps you . In the current Intel® 64 and IA-32 Architectures Software Developer Manual this is described on page 509 of 4898:In 16-bit Intel assembly it is impossible to use the AX register for register indirect addressing.

Date : January 02 2021, 06:48 AM , By : Thierry Brunet

Where is the time stamp located in a file? Want to change it using assembly

Where is the time stamp located in a file? Want to change it using assembly

it should still fix some issue Twenty years ago, when I was taking an assembly course, the professor gave a handout in which there was instruction of where the time stamp of a file was. With that information, I was able to change time stamp of files.

Date : January 02 2021, 06:48 AM , By : jonagh

How to make audio driver for MS-DOS?

How to make audio driver for MS-DOS?

To fix this issue This is a bit difficult to achieve. The Tandy sound card works by writing data to port 0xc0. In order to emulate the sound card, you need to intercept writes to that port and handle them with your software. This is impossible on the

Date : January 02 2021, 06:48 AM , By : Marc

Do two consecutive labels form two different basic block or are they the same in assembly

Do two consecutive labels form two different basic block or are they the same in assembly

should help you out Any label that's a branch target can be considered the start of a basic block.It doesn't really matter whether you look at it as falling through an empty basic block before getting to the "real" one, or whether you decide that bot

Date : January 02 2021, 06:48 AM , By : ThF

How would i make this a decryption instead of an encryption?

How would i make this a decryption instead of an encryption?

should help you out If this is a homework assignment, then it's actually quite a tricky one. (Though I may have overlooked a simple approach.)Let's focus on the effect this code has on memory. For simplicity I will assume you are not interested in th

Date : January 02 2021, 06:48 AM , By : ravibits

Floating-point addition assembly algorithm

Floating-point addition assembly algorithm

Hope this helps You do not have to care about the sign of operands if you turn them to two's complement.

Date : January 02 2021, 06:48 AM , By : delphiace

How do we track values of different registers while coding a large program

How do we track values of different registers while coding a large program

it should still fix some issue To answer the title question: yes, use comments to describe which logical "variable" is going to be in which register for a block of code. And document inputs/outputs/clobbers for each function. Like ;;; input: ds:si po

Date : January 02 2021, 06:48 AM , By : toki

Different Segments may collapse with each other

Different Segments may collapse with each other

will be helpful for those in need Setting the segment registers won't change the content of the memory (in fact in real mode memory is not accessed at all), it will only change the CPU's view of memory (the logical to linear translation). Having two

Date : January 02 2021, 06:48 AM , By : kbrust

Assigning value to the variable present in previous line using $ sign

Assigning value to the variable present in previous line using $ sign

it fixes the issue It appears that the developers were intent on using the I_AM macro to make symbols (that point at BYTEs, WORDs, and DWORDs) publicly accessible by other modules. The problem is that the I_AM macro doesn't allow you to specify the d

Date : January 02 2021, 06:48 AM , By : phil

How to read hardware input using emu8086

How to read hardware input using emu8086

To fix the issue you can do EMU8086 doesn't have any support for pass-through access to real hardware for guest code running inside the emulated 8086 PC.From what I've read, it doesn't even fully emulate PC hardware for that virtual guest machine (e.

Date : January 02 2021, 06:48 AM , By : Mike

How does LLVM handle the x86 flag register?

How does LLVM handle the x86 flag register?

it helps some times x86 flag status register is pretty target-specific and certainly should not be modeled in LLVM IR – it is too low-level. The same concepts could be modeled otherwise in target-neutral manner via llvm.uadd.with.overflow, etc.Also,

Date : January 02 2021, 06:48 AM , By : rhyhann

Sum of two numbers (each 2 characters) in assembly 8086

Sum of two numbers (each 2 characters) in assembly 8086

it helps some times Your AffichageMesRes procedure is wrong. First, it calls Somme again, in spite both numbers have already been added in the main thread debut:. Second, using the DOS function AH=2 WRITE CHARACTER TO STANDARD OUTPUT expects the char

Date : January 02 2021, 06:48 AM , By : Matt Croydon

How to alloc a segment of memory using BIOS service?

How to alloc a segment of memory using BIOS service?

it should still fix some issue I am tryng to alloc a free segment of memory using INT 12h BIOS service but I couldn't. How alloc free memory segments using INT 12h? , INT 12h

Date : January 02 2021, 06:48 AM , By : John Studdert

segmentation fault while trying to run graphics in yasm

segmentation fault while trying to run graphics in yasm

Does that help That's not x86-64 assembly but 16-bit assembly code. If you run this in a 64-bit OS I would expect a segmentation fault.This code needs to be run in real mode, probably in DOS. Today this probably means to run this code in DOSBOX or a

Date : January 02 2021, 06:48 AM , By : Star Gryphon

Register content after execution

Register content after execution

wish of those help If you don't know what a specific assembler instruction does, always refer to the AVR Instruction Set Manual where all instructions are documented in detail.The brne instruction is a conditional branch ("BRanch if Not Equal").

Date : January 02 2021, 06:48 AM , By : Mossy Breen

Explain how the flags work in conditional jumps in Assembly language

Explain how the flags work in conditional jumps in Assembly language

it fixes the issue The general idea is: there are some operations that set or clear individual flags - arithmetic, bitwise, comparisons. You are then free to perform conditional jumps based on the result of those operations.Let's consider the most ba

Date : January 02 2021, 06:48 AM , By : scotta01

What does a program (the assembly) that uses a GPU even look like?

What does a program (the assembly) that uses a GPU even look like?

To fix the issue you can do What does code that uses a GPU even look like? Read much more about OpenCL (or, for Nvidia hardware only, about CUDA). Be also aware of OpenACC ! See also OpenCL related resources, and read some OpenCL book. Read some Open

Date : January 02 2021, 06:48 AM , By : user134570

Dword conversion to dec in little endian

Dword conversion to dec in little endian

may help you . I'd like to give you an alternative explanation to Kasper's answer:In the decimal system you can "store" values from 0 to 9 in each digit. To store larger numbers, you use multiple digits. The value of a number written as "1234" is cal

Date : January 02 2021, 06:48 AM , By : jim

Is there a way to subtract packed unsigned doublewords, saturated, on x86, using MMX/SSE?

Is there a way to subtract packed unsigned doublewords, saturated, on x86, using MMX/SSE?

To fix the issue you can do If you have SSE4.1 available, I don't think you can get better than using the pmaxud+psubd approach suggested by @harold. With AVX2, you can of course also use the corresponding 256bit variants.

Date : January 02 2021, 06:48 AM , By : scotta01

How to make timer works? Call int 4ah 5 seconds after start

How to make timer works? Call int 4ah 5 seconds after start

Any of those help DOSBox does not give access to the Real Time Clock. Functions like int 1Ah AH=06h (BIOS.SetSystemAlarm) and int 21h AH=2Dh (DOS.SetSystemTime) don't operate correctly!

Date : January 02 2021, 06:48 AM , By : demize95

How to calculate the sum of a sequence of powers of 2 in x86?

How to calculate the sum of a sequence of powers of 2 in x86?

wish help you to fix your issue Base 2 is an extremely special case because computers use binary integers.2^n = 1

Date : January 02 2021, 06:48 AM , By : Gabriel

MIPS little or big endian when encoding as hex

MIPS little or big endian when encoding as hex

Any of those help In MIPS1, are hex values stored as little or big endian, for example add t1 t2 t3. Would this be stored as 00000001010010110100100000100000 0x014B4820 or 00000100000100101101001010000000 412D280 , ... or 0000010000010010110100101000

Date : January 02 2021, 06:48 AM , By : Marcos de Carvalho

Get C string length of a 16 or 32-byte fixed-size buffer? (XMM or YMM register width)

Get C string length of a 16 or 32-byte fixed-size buffer? (XMM or YMM register width)

help you fix your problem This is exactly how you implement strlen or memchr with AVX2. (For a fixed-size buffer where you know there will be a match somewhere in the buffer.)(Except now you have a redundant and).

Date : January 02 2021, 06:48 AM , By : shenol

Is there any valid use for a sign-preserving left shift?

Is there any valid use for a sign-preserving left shift?

should help you out The Intel 80960 shli instruction behaves this way. The description says, “if the bits shifted out are not the same as the sign bit, an overflow fault is generated. If overflow occurs, the sign of the result is the same as the sign

Date : January 02 2021, 06:48 AM , By : Guid

How does CPU perform operation that manipulate data that's less than a word size

How does CPU perform operation that manipulate data that's less than a word size

may help you . x86 is not a word-oriented architecture at all. Instructions are variable length with no alignment."Word size" is not a meaningful term on x86; some people may use it to refer to the register width, but instruction fetch / decode has n

Date : January 02 2021, 06:48 AM , By : hsdfhksh

Check if user input leads to overflow

Check if user input leads to overflow

Any of those help I have a trouble on checking if the overflow flag is set after the user enter a unsigned number , TL;DR: It's how it's supposed to be.

Date : January 02 2021, 06:48 AM , By : keird

What does it mean by a branch penalty?

What does it mean by a branch penalty?

To fix this issue Without (correct) branch prediction, fetch doesn't know what to fetch next until the ALU decides which way a conditional or indirect branch goes. So it stalls until the branch executes in the ALU.Or with an incorrect prediction, the

Date : January 02 2021, 06:48 AM , By : afds

Copying to arrays in NASM

Copying to arrays in NASM

Does that help I know about rep movsb but task has been to make it in loop byte after byte, I don't know if it could be done better way.

Date : January 02 2021, 06:48 AM , By : Tony Siu

Reverse byte order in XMM or YMM register?

Reverse byte order in XMM or YMM register?

I wish this helpful for you Yes, use SSSE3 _mm_shuffle_epi8 or AVX2 _mm256_shuffle_epi8 to shuffle bytes within 16-byte AVX2 "lanes". Depending on the shuffle control vector, you can swap pairs of bytes, reverse 4-byte units, or reverse 8-byte units.

Date : January 02 2021, 06:48 AM , By : Pancilobak

How to print ASCII array in Assembly?

How to print ASCII array in Assembly?

help you fix your problem I'm trying to make a car game in Assembly's graphic mode. For this, I have to print a car to the screen that I could move on the x-axis with the keyboard. I'm trying to print an ASCII array but it doesn't work. ,

Date : January 02 2021, 06:48 AM , By : Sigfrieg

How to deny or invert the memory address

How to deny or invert the memory address

wish helps you Successive addresses store a single byte that can hold values from 0 to 255. For the values from 0 to FFFFh that you want to store, you would need 131072 bytes (65536*2). In 16-bit mode (real address mode) a memory segment can have 655

Date : January 02 2021, 06:48 AM , By : FriendL

MIPS: load byte instruction

MIPS: load byte instruction

Hope that helps Assume that the processor is executing the following instruction: , 0x305502db - 7 = 0x305502d4

Date : January 02 2021, 06:48 AM , By : ciops

How to find minimum signed value in array in assembly

How to find minimum signed value in array in assembly

hope this fix your issue Your algorithm doesn't make much sense. Your current code would correspond to something like this in C:

Date : January 02 2021, 06:48 AM , By : Dave M

Bit Difference between 2 binary numbers in MIPS Assembly

Bit Difference between 2 binary numbers in MIPS Assembly

it fixes the issue XOR the bits together and then count the number of bits in the resulting number. To do that, you can loop over each bit, check if it is set (by using a bitmask and bitshift), and then increment a counter.I am purposefully leaving t

Date : January 02 2021, 06:48 AM , By : James Lupiani

Is it possible to wake up intel cores with INIT-SIPI-SIPI sequence with all cores in real mode?

Is it possible to wake up intel cores with INIT-SIPI-SIPI sequence with all cores in real mode?

To fix the issue you can do Is it possible to wake up intel cores with INIT-SIPI-SIPI sequence with all cores in real mode?

Date : January 02 2021, 06:48 AM , By : Brianna

shift right and shift left assembly language

shift right and shift left assembly language

Does that help If I want to say for example bx is a number: , What will be the new bx value? Does it stay the same?

Date : January 02 2021, 06:48 AM , By : Tonix

ASSUME directive using masm

ASSUME directive using masm

should help you out The MASM 6.1 documentation is a good resource for writing real-mode segmented code (non-FLAT models). Page 43-47 have good info on ASSUME, and segment word sizes. What you are encountering is a side effect of a rather subtle way i

Date : January 02 2021, 06:48 AM , By : user184406

IDIVQ instruction works odd . . . 16 mod 100 = 0?

IDIVQ instruction works odd . . . 16 mod 100 = 0?

this will help You are not running the code you are showing or your cpu is broken (unlikely).

Date : January 02 2021, 06:48 AM , By : 40a

Working with percentages using integer division in x86 assembly

Working with percentages using integer division in x86 assembly

wish of those help I edited your question completely because it was not easy to understand it. I hope that I fully understood your question and the question is still asking what you wants to ask.The problem you describe is actually not an Assembly la

Date : January 02 2021, 06:48 AM , By : Thomas Gueze

Objdump swapping fsubrp to fsubp on compiled assembly?

Objdump swapping fsubrp to fsubp on compiled assembly?

it helps some times This is a known bug with gas which unfortunately cannot be fixed; reversed vs. non-reversed mnemonics for x87 non-commutative floating point instructions with register operands (like fdiv vs. fdivr) is the wrong way round. As comp

Date : January 02 2021, 06:48 AM , By : Gabriel

Which value does EDX have after logic NEG and AND instructions?

Which value does EDX have after logic NEG and AND instructions?

this will help Let's take this one instruction at a time. The NOT ax will change EAX from

Date : January 02 2021, 06:48 AM , By : Wilfred Knigge

intterrupt that checks if a key was pressed and reads which key it was

intterrupt that checks if a key was pressed and reads which key it was

I wish this helpful for you I've tried int 16h \01 but all it did was changed direction once and then continued moving in that direction.

Date : January 02 2021, 06:48 AM , By : Jojo

Is it possible to get LLVM-IR from Assembly file?

Is it possible to get LLVM-IR from Assembly file?

wish of those help Your question isn't fundamentally different from Is it possible to translate an assembly language to LLVM IR, optimize it and then recompile it to a different architecture?.asm source and binary executables / object files are basic

Date : January 02 2021, 06:48 AM , By : Mikael

Finding GCD of an array of n numbers in assembly without external variables

Finding GCD of an array of n numbers in assembly without external variables

Hope this helps Step 1, cleanup and corrections Removing redundant instructions, re-arrangeing the code for less jumping, removing the potential infinite loop if 2 identical numbers are used and zeroing EDX before each division:

Date : January 02 2021, 06:48 AM , By : user122937

How do old CPUs execute the new ENDBR64 and ENDBR32 instructions?

How do old CPUs execute the new ENDBR64 and ENDBR32 instructions?

this will help Older GDB decodes F3 0F 1E FA ENDBR64 as repz nop edx.Single-stepping it on a Core 2 (Merom) in 64-bit mode produces no change in architectural state, and no faults / exceptions. (Tested in GDB 7.10 on an old Ubuntu 15.10 install).

Date : January 02 2021, 06:48 AM , By : Liviu Aileni

Loading the red component of a 24-bit bitmap image into an array

Loading the red component of a 24-bit bitmap image into an array

I wish this help you Assuming they're stored or then I imagine this is your issue:

Date : January 02 2021, 06:48 AM , By : Noah

I am not understanding this assemby language program for what(what will be the input or output)

I am not understanding this assemby language program for what(what will be the input or output)

I wish this help you I got this assembly program from my mate..My teacher provided it .Unfortunately I missed it out..Please someone say me that what the program write for (input/output or objectives) , I've commented it for you:

Date : January 02 2021, 06:48 AM , By : dbarbot

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