120 lines
3.7 KiB
Text
120 lines
3.7 KiB
Text
/* ARM assembly Raspberry PI */
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/* program preend.s */
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/* REMARK 1 : this program use routines in a include file
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see task Include a file language arm assembly
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for the routine affichageMess conversion10
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see at end of this program the instruction include */
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/*******************************************/
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/* Constantes */
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/*******************************************/
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.include "../constantes.inc"
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.equ NBCARLIBEL, 45
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.equ BUFFERSIZE, 100
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/*******************************************/
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/* Macros */
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/*******************************************/
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//.include "../../ficmacros32.inc" @ for developer debugging
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/*******************************************/
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/* Initialized data */
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/*******************************************/
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.data
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szMessDebutPgm: .asciz "Program 32 bits start. \n"
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szCarriageReturn: .asciz "\n"
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szMessFinOK: .asciz "Program normal end. \n"
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szMessString: .asciz "British Museum.\n"
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szStringStart: .asciz "The rosetta stone is at "
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szMessErrSize: .asciz "Buffer error size too small.\n"
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/*******************************************/
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/* UnInitialized data */
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/*******************************************/
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.bss
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sBuffer: .skip BUFFERSIZE
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.align 4
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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 r0,iAdrszMessDebutPgm
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bl affichageMess
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ldr r0,iAdrszMessString
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ldr r1,iAdrszStringStart
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ldr r2,iAdrsBuffer
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mov r3,#BUFFERSIZE
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bl prepend // preend string1 to string2
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cmp r0,#-1
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beq 100f
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ldr r0,iAdrszMessString
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bl affichageMess
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ldr r0,iAdrsBuffer
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bl affichageMess
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ldr r0,iAdrszMessFinOK
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bl affichageMess
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100: @ standard end of the program
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mov r0, #0 @ return code
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mov r7, #EXIT @ request to exit program
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svc 0 @ perform system call
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iAdrszMessDebutPgm: .int szMessDebutPgm
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iAdrszMessFinOK: .int szMessFinOK
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iAdrszCarriageReturn: .int szCarriageReturn
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iAdrszMessString: .int szMessString
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iAdrszStringStart: .int szStringStart
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iAdrsBuffer: .int sBuffer
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/**************************************************/
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/* preend two strings */
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/**************************************************/
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/* r0 contains the address of the string1 */
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/* r1 contains the address of the string2 */
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/* r2 contains buffer */
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/* r3 contains buffer size */
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prepend:
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push {r4-r6,fp,lr}
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mov r4,#0 // counter byte string 2
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mov r5,#0 // result byte counter
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1: // copy string 2 in result area
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ldrb r6,[r1,r4]
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cmp r6,#0
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beq 2f
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strb r6,[r2,r5]
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add r4,r4,#1 // increment indice
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add r5,r5,#1 // increment indice
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cmp r5,r3
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bge 99f // error size
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b 1b // and loop
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2:
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mov r4,#0 // counter byte string1
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3:
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ldrb r6,[r0,r4]
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strb r6,[r2,r5]
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cmp r6,#0
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beq 4f
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add r4,r4,#1 // increment indice
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add r5,r5,#1 // increment indice
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cmp r5,r3
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bge 99f // error size
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b 3b // and loop
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4:
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mov r0,r5
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b 100f
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99:
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ldr r0,iAdrszMessErrSize
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bl affichageMess
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mov r0,#-1 // error
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100:
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pop {r4-r6,fp,pc}
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iAdrszMessErrSize: .int szMessErrSize
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/***************************************************/
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/* ROUTINES INCLUDE */
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/***************************************************/
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.include "../affichage.inc"
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