120 lines
3.6 KiB
Plaintext
120 lines
3.6 KiB
Plaintext
/* ARM assembly Raspberry PI */
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/* program repeatstring.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 BUFFERSIZE, 2000
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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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szMessErreur: .asciz "Error Buffer too small!!!\n"
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szString1: .asciz "ha"
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/*********************************/
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/* UnInitialized data */
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/*********************************/
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.bss
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.align 4
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sZoneConv: .skip 24
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sBuffer: .skip BUFFERSIZE
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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 @ start message
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ldr r0,iAdrszString1 @ load phrase adress
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ldr r1,iAdrsBuffer
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mov r2,#5
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bl repeatString
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cmp r0,#0
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ble 99f
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ldr r0,iAdrsBuffer @ buffer display
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bl affichageMess
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ldr r0,iAdrszCarriageReturn
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bl affichageMess
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ldr r0,iAdrszMessFinOK
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bl affichageMess
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b 100f
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99:
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ldr r0,iAdrszMessErreur @ error
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bl affichageMess
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mov r0, #1 @ return code error
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b 100f
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100:
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mov r7,#EXIT @ program end
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svc #0 @ system call
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iAdrszMessDebutPgm: .int szMessDebutPgm
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iAdrszMessFinOK: .int szMessFinOK
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iAdrszMessErreur: .int szMessErreur
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iAdrszString1: .int szString1
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iAdrsBuffer: .int sBuffer
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iAdrsZoneConv: .int sZoneConv
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iAdrszCarriageReturn: .int szCarriageReturn
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/******************************************************************/
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/* test if number is aritmetic number */
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/******************************************************************/
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/* r0 contains string address */
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/* r1 contains buffer address */
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/* r2 number repeat */
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/* r0 return buffer writed length or -1 if error*/
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repeatString:
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push {r3-r6,lr} @ save registers
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mov r3,#0 @ indice repeat
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mov r4,#0 @ indice buffer
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1:
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mov r5,#0 @ indice string
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2:
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ldrb r6,[r0,r5] @ load string characters
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cmp r6,#0 @ end string ?
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beq 3f
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strb r6,[r1,r4] @ store char in buffer
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add r4,r4,#1 @ increment indice
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add r5,r5,#1
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b 2b @ and loop
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3:
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mul r6,r5,r2 @ compute repeat length string
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cmp r6,#BUFFERSIZE @ compare to buffer length
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movge r0,#-1 @ error ?
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bge 100f
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add r3,r3,#1 @ increment repeat counter
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cmp r3,r2 @ end ?
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blt 1b
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mov r6,#0
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strb r6,[r1,r4] @ final zero
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mov r0,r4 @ return length
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100:
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pop {r3-r6,pc} @ restaur registers
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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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