Call a function: Difference between revisions

=={{header|AArch64 Assembly}}==

{{works with|as|Raspberry Pi 3B version Buster 64 bits}}

<lang AArch64 Assembly>

/* ARM assembly AARCH64 Raspberry PI 3B */

/* program callfonct.s */

/*******************************************/

/* Constantes file */

/*******************************************/

/* for this file see task include a file in language AArch64 assembly*/

.include "../includeConstantesARM64.inc"

/***********************/

/* Initialized data */

/***********************/

.data

szMessage: .asciz "Hello. \n" // message

szRetourLigne: .asciz "\n"

szMessResult: .asciz "Resultat : " // message result

/***********************/

/* No Initialized data */

/***********************/

.bss

sZoneConv: .skip 100

.text

.global main

main:

ldr x0,=szMessage // adresse of message short program

bl affichageMess // call function with 1 parameter (x0)

// call function with parameters in register

mov x0,#5

mov x1,#10

bl fonction1 // call function with 2 parameters (x0,x1)

ldr x1,qAdrsZoneConv // result in x0

bl conversion10S // call function with 2 parameter (x0,x1)

ldr x0,=szMessResult

bl affichageMess // call function with 1 parameter (x0)

ldr x0,qAdrsZoneConv

bl affichageMess

ldr x0,qAdrszRetourLigne

bl affichageMess

// call function with parameters on stack

mov x0,#5

mov x1,#10

stp x0,x1,[sp,-16]! // store registers on stack

bl fonction2 // call function with 2 parameters on the stack

// result in x0

ldr x1,qAdrsZoneConv

bl conversion10S // call function with 2 parameter (x0,x1)

ldr x0,=szMessResult

bl affichageMess // call function with 1 parameter (x0)

ldr x0,qAdrsZoneConv

bl affichageMess

ldr x0,qAdrszRetourLigne

bl affichageMess

// end of program

mov x0, #0 // return code

mov x8, #EXIT // request to exit program

svc 0 // perform the system call

qAdrsZoneConv: .quad sZoneConv

qAdrszRetourLigne: .quad szRetourLigne

/******************************************************************/

/* call function parameter in register */

/******************************************************************/

/* x0 value one */

/* x1 value two */

/* return in x0 */

fonction1:

stp x2,lr,[sp,-16]! // save registers

mov x2,#20

mul x0,x0,x2

add x0,x0,x1

ldp x2,lr,[sp],16 // restaur 2 registres

ret // retour adresse lr x30

/******************************************************************/

/* call function parameter in the stack */

/******************************************************************/

/* return in x0 */

fonction2:

stp fp,lr,[sp,-16]! // save registers

add fp,sp,#16 // address parameters in the stack

stp x1,x2,[sp,-16]! // save others registers

ldr x0,[fp] // second paraméter

ldr x1,[fp,#8] // first parameter

mov x2,#-20

mul x0,x0,x2

add x0,x0,x1

ldp x1,x2,[sp],16 // restaur 2 registres

ldp fp,lr,[sp],16 // restaur 2 registres

add sp,sp,#16 // very important, for stack aligned

ret // retour adresse lr x30

/********************************************************/

/* File Include fonctions */

/********************************************************/

/* for this file see task include a file in language AArch64 assembly */

.include "../includeARM64.inc"

</lang>

{{output}}

<pre>

Hello.

Resultat : +110

Resultat : -90

</pre>