How to resolve the algorithm Copy a string step by step in the AArch64 Assembly programming language

Published on 12 May 2024 09:40 PM
#Aarch64 assembly

How to resolve the algorithm Copy a string step by step in the AArch64 Assembly programming language

Table of Contents

Problem Statement

This task is about copying a string.

Where it is relevant, distinguish between copying the contents of a string versus making an additional reference to an existing string.

Let's start with the solution:

Step by Step solution about How to resolve the algorithm Copy a string step by step in the AArch64 Assembly programming language

Source code in the aarch64 programming language

/* ARM assembly AARCH64 Raspberry PI 3B */
/*  program copystr64.s   */
 
/*******************************************/
/* Constantes file                         */
/*******************************************/
/* for this file see task include a file in language AArch64 assembly*/
.include "../includeConstantesARM64.inc"
/*******************************************/
/* Initialized data                        */
/*******************************************/
.data
szString: .asciz "ABCDEFGHIJKLMNOPQRSTUVWXYZ\n"
/*******************************************/
/* UnInitialized data                      */
/*******************************************/
.bss 
.align 4
qPtString:    .skip 8
szString1:    .skip 80
/*******************************************/
/*  code section                           */
/*******************************************/
.text
.global main 
main:                    // entry of program
 
                         // display start string 
    ldr x0,qAdrszString
    bl affichageMess
                         // copy pointer string
    ldr x0,qAdrszString
    ldr x1,qAdriPtString
    str x0,[x1]
                         // control
    ldr x1,qAdriPtString
    ldr x0,[x1]
    bl affichageMess
                         // copy string
    ldr x0,qAdrszString    
    ldr x1,qAdrszString1
1:
    ldrb w2,[x0],1       // read one byte and increment pointer one byte
    strb w2,[x1],1       // store one byte and increment pointer one byte
    cmp x2,#0            // end of string ?
    bne 1b               // no -> loop 
                         // control
    ldr x0,qAdrszString1
    bl affichageMess
 
100:                     // standard end of the program */
    mov x0,0             // return code
    mov x8,EXIT          // request to exit program
    svc 0                // perform the system call
qAdrszString:        .quad szString
qAdriPtString:       .quad qPtString
qAdrszString1:       .quad szString1
/********************************************************/
/*        File Include fonctions                        */
/********************************************************/
/* for this file see task include a file in language AArch64 assembly */
.include "../includeARM64.inc"

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