Category "assembly"

Why does GCC include an "empty" XOR

I have following piece of code: typedef struct { int x; int y; int z; int w; } s32x4; s32x4 f() { s32x4 v; v.x

error in partition function (mips assembly)

This is the code I wrote trying to implement the c partition function in mips. There seems to be an error because the program doesn't work, yet I can't find whe

C++ - How to debug SIGILL ILL_ILLOPN

Recently I ran into a crash while the following statement is getting executed static const float kDefaultTolerance = DoubleToFloat(0.25); where DoubleToFloat

How to divide two unsigned long 64 bit values in x86 assembly and then returning the quotient and remainder to a C program

In a separate C program, I have passed 4 parameters to an x86 ASM program. dividend divisor Quotient pointer Remainder pointer dividend = 0xA divisor = 0x3 Whic

why is my assembly program (changing background color with keyboard) not working [duplicate]

I am writing a program in assembly that changes the background color from clicks on the keyboard but I can't seem to make it work, anyone know

What does it take for pacman to function correctly?

I'm experiencing 2 problems: the "you win" screen does not show up the pacman has a trail. IDEAL p286 MODEL small STACK 100h DATASEG pacman db " _ __ _

How to open a saved .asm file in MARS on MacOS

I am new to using MIPS and I can't find how to open a file that I saved. I saved a .asm file under my downloads folder but when I try to open a file in MARS and

"There is no need to deallocate the stack at the end of the function when the inner-stack frame isn't modified", but it is being modified in this case

Here is a simple function #include <stdio.h> int foo() { int a = 3; int b = 4; int c = 5; return a * b * c; } int main() { int a = f

How can I get the range of numbers that would produce certain flag conditions when subtracted from 43h in Z80 assembly?

I started learning Z80 recently, but I'm struggling with flags. I want to get the range of register "B" in Z80 assembly. This is the problem that I faced. Regis

What does this i386 os code mean? The code is for resetting the system

/* jump to reset vector. esp := 0 */ int main(int argc, char **argv) { PRINT("reset\n"); _eflags = 0; // interrupt disabled __asm__ __volatile__ ("\

Нow to define a constant managed record with an overridden assignment method

I'm writing a program for mathematical research. Assembly language is used for speed. Data is represented as managed records with operator overloads. Some data

LDUR and STUR in ARM v8

I've had a couple of courses that touched on ARMv8 assembly, but both teachers described LDUR/STUR instructions a different way and now I've become pretty lost.

adressing in MIPS the proper way

what does the following line mean. is it taking the 4 bytes (16 bits) of whatever bit pattern is at $a3 and storing it to $t0? lw $t0, 4($a3) # extract ch

Are there any instructions (other than those that use RIP-relative addressing) that are position dependent?

(This question refers specifically to x86/x86_64) I'm working on an application that needs to insert a small block of instructions at specific points within ano

Is a mov to a segmentation register slower than a mov to a general purpose register?

Specifically is: mov %eax, %ds Slower than mov %eax, %ebx Or are they the same speed. I've researched online, but have been unable to find a definitive an

Writing a putchar in Assembly for x86_64 with 64 bit Linux?

I am trying to use the write syscall in order to reproduce the putchar function behavior which prints a single character. My code is as follows, asm_putchar:

Understand EQU and >> operators on them in RISC-V assembly, with LUI and ADDI

my prof posted this as one of the answers to a homework problem. Can anyone break this down for me? I don't understand what he is doing with CON1 - CON4 and wha

Finding the minimum value on a list Assembly Language GAS

I'm trying to find the minimum value of a list using assembly language. I'm trying to use -1 to compare all the other values to. my current code is data_items:

Finding the minimum value on a list Assembly Language GAS

I'm trying to find the minimum value of a list using assembly language. I'm trying to use -1 to compare all the other values to. my current code is data_items:

Find out higher bit with assembly language

I am new to assembly language. Please help me how to find the higher bits after these instruction MOV AX,08H MOV BX, 07H ADD AX,BX I know a little bit shiftin