Initial data commit

Task/Singly-linked-list-Element-definition/ARM-Assembly/singly-linked-list-element-definition.arm

@@ -0,0 +1,68 @@
+/* ARM assembly Raspberry PI  */
+/*  program defList.s   */
+
+/* Constantes    */
+.equ STDOUT, 1                           @ Linux output console
+.equ EXIT,   1                           @ Linux syscall
+.equ READ,   3
+.equ WRITE,  4
+
+.equ NBELEMENTS,      100                @ list size
+
+/*******************************************/
+/* Structures                               */
+/********************************************/
+/* structure linkedlist*/
+    .struct  0
+llist_next:                             @ next element
+    .struct  llist_next + 4
+llist_value:                            @ element value
+    .struct  llist_value + 4
+llist_fin:
+/* Initialized data */
+.data
+szMessInitListe:         .asciz "List initialized.\n"
+szCarriageReturn:        .asciz "\n"
+/* datas error display */
+szMessErreur:            .asciz "Error detected.\n"
+
+/* UnInitialized data */
+.bss
+lList1:                  .skip llist_fin * NBELEMENTS    @ list memory place
+
+/*  code section */
+.text
+.global main
+main:
+    ldr r0,iAdrlList1
+    mov r1,#0
+    str r1,[r0,#llist_next]
+    ldr r0,iAdrszMessInitListe
+    bl affichageMess
+
+100:                                    @ standard end of the program
+    mov r7, #EXIT                       @ request to exit program
+    svc 0                               @ perform system call
+iAdrszMessInitListe:       .int szMessInitListe
+iAdrszMessErreur:          .int szMessErreur
+iAdrszCarriageReturn:      .int szCarriageReturn
+iAdrlList1:                .int lList1
+/******************************************************************/
+/*     display text with size calculation                         */
+/******************************************************************/
+/* r0 contains the address of the message */
+affichageMess:
+    push {r0,r1,r2,r7,lr}                       @ save  registers
+    mov r2,#0                                   @ counter length */
+1:                                              @ loop length calculation
+    ldrb r1,[r0,r2]                             @ read octet start position + index
+    cmp r1,#0                                   @ if 0 its over
+    addne r2,r2,#1                              @ else add 1 in the length
+    bne 1b                                      @ and loop
+                                                @ so here r2 contains the length of the message
+    mov r1,r0                                   @ address message in r1
+    mov r0,#STDOUT                              @ code to write to the standard output Linux
+    mov r7, #WRITE                              @ code call system "write"
+    svc #0                                      @ call system
+    pop {r0,r1,r2,r7,lr}                        @ restaur registers
+    bx lr                                       @ return