87 lines
3.4 KiB
Plaintext
87 lines
3.4 KiB
Plaintext
/* ARM assembly AARCH64 Raspberry PI 3B */
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/* program appendstr64.s */
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/*******************************************/
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/* Constantes file */
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/*******************************************/
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/* for this file see task include a file in language AArch64 assembly*/
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.include "../includeConstantesARM64.inc"
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.equ BUFFERSIZE, 100
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/*******************************************/
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/* Initialized data */
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/*******************************************/
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.data
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szMessString: .asciz "String :\n"
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szString1: .asciz "Alphabet : "
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sComplement: .fill BUFFERSIZE,1,0
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szString2: .asciz "abcdefghijklmnopqrstuvwxyz"
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szCarriageReturn: .asciz "\n"
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/*******************************************/
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/* UnInitialized data */
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/*******************************************/
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.bss
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/*******************************************/
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/* code section */
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/*******************************************/
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.text
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.global main
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main:
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ldr x0,qAdrszMessString // display message
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bl affichageMess
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ldr x0,qAdrszString1 // display begin string
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bl affichageMess
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ldr x0,qAdrszCarriageReturn // display return line
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bl affichageMess
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ldr x0,qAdrszString1
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ldr x1,qAdrszString2
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bl append // append sting2 to string1
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ldr x0,qAdrszMessString
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bl affichageMess
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ldr x0,qAdrszString1 // display string
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bl affichageMess
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ldr x0,qAdrszCarriageReturn
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bl affichageMess
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100: // standard end of the program
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mov x0,0 // return code
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mov x8,EXIT // request to exit program
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svc 0 // perform system call
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qAdrszMessString: .quad szMessString
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qAdrszString1: .quad szString1
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qAdrszString2: .quad szString2
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qAdrszCarriageReturn: .quad szCarriageReturn
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/**************************************************/
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/* append two strings */
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/**************************************************/
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/* x0 contains the address of the string1 */
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/* x1 contains the address of the string2 */
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append:
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stp x1,lr,[sp,-16]! // save registers
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mov x2,#0 // counter byte string 1
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1:
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ldrb w3,[x0,x2] // load byte string 1
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cmp x3,#0 // zero final ?
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add x4,x2,1
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csel x2,x4,x2,ne // if x3 not equal 0, x2 = X2 +1 else x2
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bne 1b // no -> loop
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mov x4,#0 // counter byte string 2
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2:
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ldrb w3,[x1,x4] // load byte string 2
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strb w3,[x0,x2] // store byte string 1
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cbz x3,100f // zero final ?
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add x2,x2,1 // no -> increment counter 1
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add x4,x4,1 // no -> increment counter 2
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b 2b // no -> loop
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100:
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ldp x1,lr,[sp],16 // restaur 2 registers
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ret // return to address lr x30
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/********************************************************/
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/* File Include fonctions */
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/********************************************************/
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/* for this file see task include a file in language AArch64 assembly */
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.include "../includeARM64.inc"
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