/* ARM assembly AARCH64 Raspberry PI 3B */
/*  program strcase64.s   */

/************************************/
/* Constantes                       */
/************************************/
/* for this file see task include a file in language AArch64 assembly*/
.include "../includeConstantesARM64.inc"

/************************************/
/* Initialized data                 */
/************************************/
.data
szMessResult:         .asciz "Result: \n"
szString:             .asciz "alphaBETA"
szCarriageReturn:     .asciz "\n"
szMessStart:          .asciz "Program 64 bits start.\n"
/************************************/
/* UnInitialized data               */
/************************************/
.bss
sBuffer:            .skip 80
sBuffex1:           .skip 80
/************************************/
/*  code section                    */
/************************************/
.text
.global main
main:                    // entry of program
    ldr x0,qAdrszMessStart
    bl affichageMess
    ldr x1,qAdrszString
    ldr x3,qAdrsBuffer
    ldr x4,qAdrsBuffex1
    mov x6,#0b100000     // 1 -> bit 5
    mov x2,#0
1:
    ldrb w0,[x1,x2]      // load byte of string
    mov x5,x0
    cmp x0,#'A'          // select alpha characters lower or upper
    blt 3f
    cmp x0,#'z'
    bgt 3f
    cmp x0,#'Z'
    ble 2f
    cmp x0,#'a'
    bge 2f
    b 3f
2:
    orr x0,x0,x6          // converion in lower case (1 -> bit 5)
    bic x5,x0,x6          // converion in upper case (0 -> bit 5)
3:
    strb w0,[x3,x2]       // store lower character
    strb w5,[x4,x2]       // store upper character
    cmp x0,#0             // end string ?
    add x2,x2,#1          // increment index character
    bne 1b                // loop


    ldr x0,qAdrszMessResult
    bl affichageMess
    ldr x0,qAdrsBuffer
    bl affichageMess
    ldr x0,qAdrszCarriageReturn
    bl affichageMess
    ldr x0,qAdrsBuffex1
    bl affichageMess
    ldr x0,qAdrszCarriageReturn
    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
qAdrsBuffer:              .quad  sBuffer
qAdrsBuffex1:             .quad  sBuffex1
qAdrszMessResult:         .quad  szMessResult
qAdrszCarriageReturn:     .quad  szCarriageReturn
qAdrszMessStart:          .quad  szMessStart
/***************************************************/
/*      ROUTINES INCLUDE                           */
/***************************************************/
/* for this file see task include a file in language AArch64 assembly*/
.include "../includeARM64.inc"