Practica 13: Imprimir un patron - Roldan Castro Luis Alberto

by LuisRoldan 10 months ago

GNU/Linux • xterm-256color • bash 141 views

// ****************************************************************************
// * Nombre del archivo: practica.s
// * Descripción: Calcular e imprimir la suma de los enteros del 1 al 20
// * Autor: Roldan Castro Luis Alberto
// * Fecha: 07-04-2025
// * Plataforma: Raspberry Pi OS (64 bits)
// * Asciinema: https://asciinema.org/a/aWdi5Ij8dTIlxGA06dvwLNUSU
// ****************************************************************************

// ****************************************************************************
// Codigo equivalente en python
//
//suma = sum(range(1, 21))
//print("La suma de los enteros del 1 al 20 es:", suma)
// ****************************************************************************

.section .data
newline: .asciz "\n"

.section .bss
buffer: .skip 20

.section .text
.global _start

_start:
    mov x0, #1         // x0 = número actual (empieza en 1)
    mov x1, #0         // x1 = suma total

loop:
    cmp x0, #21        // si x0 > 20, salir del bucle
    b.ge imprimir

    add x1, x1, x0     // suma += x0
    add x0, x0, #1     // siguiente número
    b loop

imprimir:
    mov x0, x1         // cargar el valor de la suma
    bl print_number    // imprimir número

    // salto de línea
    ldr x0, =newline
    mov x1, #1
    bl print

    // salir del programa
    mov x8, #93
    mov x0, #0
    svc #0

// ----------------------------------------
// Función para imprimir el número en x0
// ----------------------------------------
print_number:
    ldr x1, =buffer
    add x1, x1, #19
    mov x2, #0
.num_loop:
    mov x3, #10
    udiv x4, x0, x3
    msub x5, x4, x3, x0
    add x5, x5, #'0'
    sub x1, x1, #1
    strb w5, [x1]
    mov x0, x4
    add x2, x2, #1
    cmp x0, #0
    b.ne .num_loop

    mov x0, #1
    mov x8, #64
    mov x1, x1
    mov x2, x2
    svc #0
    ret

// ----------------------------------------
// Función para imprimir cadena: x0 = ptr, x1 = len
// ----------------------------------------
print:
    mov x2, x1
    mov x1, x0
    mov x0, #1
    mov x8, #64
    svc #0
    ret

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