Assembly Questions

I've compiled the following c code in compiler exporer to see how it handles

In c, we can use the following two examples to show the difference between a static and non-static variable: for (int i = 0; i <

Suppose i have several threads accessing the same memory location. and, if at all, they all write the same value and none of them reads it. after

So i am doing the protostar challenges from exploit

Let's say i have the following assembly program: .globl _start _start: mov $1, %eax int $0x80 and i

Note, this question already has similar answers here, which i want to point out to:

i

I have an arduino mega program written in c that populates an array with random integers, then calls a bubble sort algorithm written in asm inline

I want to set a bit at position p without using btsl instruction with inline asm gcc c code. using btsl instruction is simple: int

I have written the following c code:

Does the compiler translate the address operator any different than a pointer? i'm wondering because the decompiler sometimes shows me:

1)why cant we use virtual address in c instead variable for example instead writing int x ; we may create a pointer to the first address in the

I currently have a react app that i'm trying to convert to a blazor webassembly app. the react app has a component that imports a javascript

Everybody! i'm trying to make some project using assembly functions, which call from c. in c, i use errno.h. so i want to write errors,

To the best of my understanding, on intel x86 (e.g., ice lake micro-architecture) i could expect and for two unsigned integers to be

I'm trying to call js function from c/c++ with an array of strings as an argument. here's my example code:

Assume i have a compiled binary program, without debug symbols, with a source code similar to this in c: char code[] =

Even i get an warning a function returns an address from local variable, it compiles. isn't it then ub of compiler? the generated

I want to try to measure timing differences of memory accesses, when accessed from the cache and when accessed from the main memory.

I have an m.c: extern void a(char*); int main(int ac, char **av){ static char string [] = "hello ,

So i want to get the value or state of specific xmm registers. this is primarily for a crash log or just to see the state of the registers for

I want to be able to declare function so that they are added to a specific code section and then they are all executed before my start function.

Running $ gcc -v results in the first command being a cc1 command. first of all, where can i find what all the

I think the file that is produced is an .asm file, any idea how to produce this in visual studio when you do a build?

We know that by x86-64 convention, registers %rbx, %rbp, and %r12–%r15 are classified as

The way to declare local variables in macro asm of nasm is like:%local old_ax:word,and the way to declare local variables in macro asm of masm is

I am practicing webassembly at

Working on an college - assembly language c course -assignment where i need to create a basic printf function using only system calls. whenever

Suppose i have following program: #include <signal.h> #include <stddef.h> #include <stdlib.h> static void

I'm trying to call a wasi function (fd_write) directly in a c program using

Suppose we have two register-length2 signed1 integers, say a and b. we want to compute the value

After trying to replace the offset keyword with __offsetof while trying to compile with apple gcc

I'm writing blazor wasm app in .net 6. the app works as it should in debug when running from visual studio 2022, but when i

I would like to modify a string inside a c structure with an asm function but it is not working properly... let say that i have this type

...or rather, why does not static_cast-ing slow down my function? consider the function below, which performs integer

I remember some rules from a time ago (pre-32bit intel processors), when was quite frequent (at least for me) having to analyze the assembly

%ax = (%ah + %al) so why not %eax = (%some_register + %ax) for some register %some_register?

I decided to teach myself assembly language. i have realized that my program will not compile if i attempt to change the value of any

Does anyone know how i can get rid of the following assembler warning? code is x86, 32 bit: int test (int x) { int y;

File hierarchy: src: main.c main.html main.js out: main.wasm -> compiled file main.c:

I am running the code below and suffering from two problems: 1) the moment i change movl (to copy values from registers) to movq i face

Here is a minimal reproducible example: /* * example for xtensa xt-xcc compiler "error: attempt to move .org backwards".

Yes there is a fpu present with my specific mcu. the code is compiled with the -mfloat-abi=soft flag otherwise the float

I would need some help with using ngspice as a library in a webassembly (wasm) project. i installed emsdk and newest version of emcc

In a web app i am building, i have a need to execute untrusted user code within the app (in the browser). the untrusted code is given a string

In an asm function, one can use the stack to create a local workspace for variables. what i am wondering is, can you create labels to

I have an html input like this <input type="file" id="myfile" onchange="load_file()">. i want to load the file into

I am getting an error with llc for llvm, which i just installed on my mac with homebrew. $ llc –o malloc.s malloc.ll

I have this c file: int mult() { int a =5; int b = 3; int c = a * b; return c; } i compile it to llvm ir

the

I'm trying to create a minimal 64-bit windows executable to better understand how the windows executable format works. i wrote very basic

I'm analysing a piece of inefficient code, but some of it is so confusing? original code:

In the near protocol smart contract development documentation for assemblyscript it says:

When trying to write some routine in x86 assembly for a boot loader, i came across a bug where when a division error happened, the program would

I'm encountering errors in importing a javascript file into a vue.js component: this is the content of /components sub-folder:

I have a library i can successfully build & run with the emscripten generated .html files. i'd like to use it with react now,

Assuming having this c code, int add(int a, int b) { return a + b; } int mul(int a, int b) { return a * b; } void *add_ptr() {

I've been a bit stuck on this question. given the following c code: #include <stdio.h> #define buf_size 13 int foo(){

I am developing on an arm cortex m3. my ide generates a c source file which includes an isr vector table written in c as a struct of

I'm using emscripten to compile some c code to webassembly. this is the final emcc call in my makefile: emcc $(cflags) iva.a -o

As far as i understood, javascript cannot be compiled ahead of time because of it's dynamic nature. so interpretation and just in time

Using emscripten v 1.38.43, i'm compiling a c code. for optimization reasons, i've stripped down the generated js glue code and minimize the code

I am learning assembly language and got stuck on this point. this is a problem from book "computer system" chapter 3. the problem

I would like to have a void function which prints whether carry (overflow) happened and print the value of the (possibly overflowed)

Is is possible to debug a wasm module through node? i am using vscode and compiling with emcc -g4 --source-map-base. putting

I've been stuck trying to figure out the addressing mode of this instruction.if anyone can help me with this it would be appreciated.

I have tried to use the this syscall macro

I'm in a project groupe about analyzing malware at my university and i have to write a programm that generates garbage code like it used to appear

I had just started a laravel project and went to go use npm install but it paused at webassembly dependancy and displayed maximum call stack size

I created a simple custom blazor component inheriting from inputnumber<t> to contain an input element and some other conveniences (i

Is there any way to generate elf binary using only the python library? i want to assemble the file below using python

I want to create some

I'm using a webassembly file compiled by emscripten in my project. and since my project uses webpack, it renames all files, then the emscripten

I am currently working on a personal node.js (>=8.0.0) project which requires me to call c subroutines (to improve execution time). i am trying to

I am experimenting with wasm and i want to encode a pic as webp for a learning experience in wasm. i am attempting to compile

I wanted to see how the disassembly of an if-else program written in c looks like inside gdb. to keep things simple, i created the following

I have this piece of inline assembly code that should print a in text mode: void print(){ asm volatile(

From all the docs i've found, there is no mention of syntax like offset[var+offset2] in intel x86 syntax but gcc with the following

Here's a fragment of my code and as you can see the only difference between these three is the move from $v0 to $t0, $t1, or $t2. does anyone know

Ideal model small stack 100h jumps p186 dataseg array dw 312, 340, 311, 300 codeseg proc example pusha mov al ,4 ;number of

Very simple assembly introduction code. seems to compile ok through gcc -o prog1 prog1.s, then ./prog1 just skips a

My goal is to create shellcode that calls winexec and launches notepad.exe. the bare bones code is (although actually

I have this: $ make build read.o: in function `_start': read.asm:(.text+0x0): multiple definition of `_start'

I was reading a textbook which describes two way of translating a while loop into machine code: //jump to middle goto test;

I'm compiling this c source with openwatcom v2 wcc: /* writes a '\0'-terminated string to the file descriptor. */

I spotted several articles about wasm being faster then js

I'm learning about buffer overflow in c. for that purpose, i'm following

Consider this function: unsigned long f(unsigned long x) { return x / 7; } with -o3, clang

This simple c: #include <stdio.h> #include <string.h> int *add(int a, int b){ int ar[1]; int result = a+b;

I apologize in advance for the bad language, i mainly use a google translator. i decided to do something like my os (naturally, it will just be

I am programming a little kernel, and implement idt and interrupts. this c code in my little kernel not generate any interrupt:

I'm a newbie to c and gcc compilers and trying to study how c is compiled into machine code by disassembling binaries produced, but the result of

Given this code (minimal example; there's no deeper meaning in it): #include <stdio.h>

I want to integrate jquery datatable with my blazor wasm project. so i add

Supose this c code: int main(){ int n; scanf("%d\n", &n); int a[n]; int i; for (i = 0;

Note: i'm running on freebsd, but i've also included linux as a tag since the problem is somewhat general and linux-specific solutions are

I want to assemble arm instructions (= converting the textual assembly instructions to machine code). i tried using

This is the function that call's insl. void ide_read_buffer(unsigned char channel, unsigned char reg, unsigned int buffer,

I was wondering how void pointers are implemented. i tried to find it out on godbolt with x86-64 (you can see it

Below is the pom.xml. when i try running it with mvn package, the fat jar is not getting built. but mvn assembly:single