Data commit

Task/Here-document/ARM-Assembly/here-document.arm

@@ -0,0 +1,56 @@
+/* ARM assembly Raspberry PI  */
+/*  program heredoc.s   */
+
+/* Constantes    */
+.equ STDOUT, 1                           @ Linux output console
+.equ EXIT,   1                           @ Linux syscall
+.equ WRITE,  4                           @ Linux syscall
+
+.equ BUFFERSIZE,          100
+
+/* Initialized data */
+.data
+szMessString:            .asciz "String :
+ ABCD
+            EFGH	TAB    \n"
+
+szCarriageReturn:       .asciz "\n"
+
+/* UnInitialized data */
+.bss
+
+/*  code section */
+.text
+.global main
+main:
+
+    ldr r0,iAdrszMessString                     @ display message
+    bl affichageMess
+
+
+100:                                            @ standard end of the program
+    mov r0, #0                                  @ return code
+    mov r7, #EXIT                               @ request to exit program
+    svc 0                                       @ perform system call
+iAdrszMessString:         .int szMessString
+iAdrszCarriageReturn:     .int szCarriageReturn
+
+/******************************************************************/
+/*     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