How to swap the first row and column of a matrix in assembler?

Question

C++ / C#

Hello! The problem is this: Given a task, you need to write a program in which the main module is in C C++, and the additional module is in Assembly language. The program must necessarily consist of 2 separate files, i.e. You cannot embed the assembler code in the C ++ code. From the main module I pass the number of matrix elements, and a pointer to the first matrix element.

In the assembler, you need to: swap the elements of the first column and the first row in the matrix, if the sum of the first column = the sum of the first row.

Code written in C++:

#include <iostream>
#include <ctime>
#include <cstdlib>
#include <iomanip>
#include <conio.h>

//extern "C" void asm_proc(int **a, int, int); // описание прототипа ASM-подпрограммы
using namespace std;

void Input(int** a, int n);
void Output(int** a, int n);
void Delete(int** a, int n);
void Obm (int** a, int n);
int main()
{
  setlocale(LC_ALL, "russian");
  srand(time(0)); // генерация случайных чисел
  int** a = new int* [3]; // 3 строки в массиве
  for (int count = 0; count < 3; count++)
    a[count]= new int[3]; // и 3 столбцов
  cout << "Задание: Если сумма элементов первой строки = сумме элементов первого столбца, " << endl << "обмнять элементы первой строки с элементами первого столбца " << endl<<endl;
  cout << "Введите элементы массива: " << endl;
  Input(a, 3);
  //asm_proc(a, 3);
  Obm(a, 3);
  cout << "Массив после оброботки: " << endl;
  Output(a,3);
  Delete(a, 3);
  getchar(); getchar();
  return 0;
}
void Obm(int** a, int n)
{
  int str = 0, stb = 0, d, i= 0, j =0;
va: 
    str += a[0][i];
    stb += a[i][0];
    i++;
    if (i != n)
      goto va;

  if (str == stb)
  {
vb:		
      d = a[0][j];
      a[0][j] = a[j][0];
      a[j][0] = d;
      j++;
      if (j != n)
        goto vb;
  }
}
void Input(int **a, int n)//функция заполнения массива с входными параметрами: массив и ограничение
{
  for (int i = 0; i < n; i++)
  {
    for (int j = 0; j < n; j++)
      cin >> a[i][j] ; // заполняем случайными числами
  }
}
void Output(int** a, int n)//функция вывода массива в консоль
{
  for (int i = 0; i < n; i++)
  {
    for (int j = 0; j < n; j++)
      cout << a[i][j] << "\t";//потоковый вывод
    cout << endl;//переход на следующую строку
  }
}
void Delete(int** a, int n)
{
  for (int i = 0; i < n; i++)
    delete[]a[i];
}

Help, please write the code in assembler. I started writing something, but I don’t know how it should look like and got confused:

.586
.model flat, stdcall
option   casemap  :  none    
 
.data
 
A   dd  1,2,3,11,12,13,21,22,23
len_str  dd 0       
n_str   dd 3        
n_colum   dd 3      
 
.code
start:
 
mov eax,n_colum
shl eax,2
mov len_str,eax     
 
Xor esi,esi
Mov ecx,n_str           
    m2: Xor edi,edi
        Push ecx
        Mov ecx,   n_colum         
    m1: Mov eax,   A[esi][edi*4]    
        Inc edi             
        Loop  m1            
        add  esi,len_str            
                 
        Pop ecx         
        Dec ecx
        Jnz m2              
    end start

Or at least write how it should look like passing an array from C ++ to assembler and returning back the edited one. I will write the edit myself

Answer 1

Instead of assembler, write C code first. Then you get rid of the loops and rewrite them to goto. And now transfer it to asm.