74 lines
2.7 KiB
Text
74 lines
2.7 KiB
Text
/* ARM assembly Raspberry PI */
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/* program perfectNumber.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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/* for constantes see task include a file in arm assembly */
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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 MAXI, 1<<31
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/*********************************/
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/* Initialized data */
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/*********************************/
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.data
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sMessResultPerf: .asciz "Perfect : @ \n"
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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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sZoneConv: .skip 24
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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: @ entry of program
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mov r2,#2 @ begin first number
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1: @ begin loop
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mov r5,#1 @ sum
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mov r4,#2 @ first divisor 1
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2:
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udiv r0,r2,r4 @ compute divisor 2
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mls r3,r0,r4,r2 @ remainder
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cmp r3,#0
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bne 3f @ remainder = 0 ?
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add r5,r5,r0 @ add divisor 2
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add r5,r5,r4 @ add divisor 1
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3:
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add r4,r4,#1 @ increment divisor
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cmp r4,r0 @ divisor 1 < divisor 2
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blt 2b @ yes -> loop
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cmp r2,r5 @ compare number and divisors sum
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bne 4f @ not equal
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mov r0,r2 @ equal -> display
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ldr r1,iAdrsZoneConv
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bl conversion10 @ call décimal conversion
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ldr r0,iAdrsMessResultPerf
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ldr r1,iAdrsZoneConv @ insert conversion in message
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bl strInsertAtCharInc
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bl affichageMess @ display message
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4:
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add r2,#2 @ no perfect number odd < 10 puis 1500
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cmp r2,#MAXI @ end ?
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blo 1b @ no -> loop
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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 the system call
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iAdrszCarriageReturn: .int szCarriageReturn
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iAdrsMessResultPerf: .int sMessResultPerf
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iAdrsZoneConv: .int sZoneConv
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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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