226 lines
7.3 KiB
Plaintext
226 lines
7.3 KiB
Plaintext
/* ARM assembly Raspberry PI */
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/* program readwrtfile.s */
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/*********************************************/
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/*constantes */
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/********************************************/
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.equ STDOUT, 1 @ Linux output console
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.equ EXIT, 1 @ Linux syscall
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.equ READ, 3
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.equ WRITE, 4
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.equ OPEN, 5
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.equ CLOSE, 6
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.equ CREATE, 8
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/* file */
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.equ O_RDWR, 0x0002 @ open for reading and writing
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.equ TAILLEBUF, 1000
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/*********************************/
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/* Initialized data */
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/*********************************/
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.data
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szMessErreur: .asciz "Erreur ouverture fichier input.\n"
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szMessErreur4: .asciz "Erreur création fichier output.\n"
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szMessErreur1: .asciz "Erreur fermeture fichier.\n"
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szMessErreur2: .asciz "Erreur lecture fichier.\n"
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szMessErreur3: .asciz "Erreur d'écriture dans fichier de sortie.\n"
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szRetourligne: .asciz "\n"
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szMessErr: .ascii "Error code : "
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sDeci: .space 15,' '
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.asciz "\n"
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szNameFileInput: .asciz "input.txt"
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szNameFileOutput: .asciz "output.txt"
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/*******************************************/
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/* DONNEES NON INITIALISEES */
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/*******************************************/
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.bss
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sBuffer: .skip TAILLEBUF
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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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push {fp,lr} /* save registers */
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ldr r0,iAdrszNameFileInput @ file name
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mov r1,#O_RDWR @ flags
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mov r2,#0 @ mode
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mov r7,#OPEN @ call system OPEN
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swi #0
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cmp r0,#0 @ open error ?
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ble erreur
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mov r8,r0 @ save File Descriptor
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ldr r1,iAdrsBuffer @ buffer address
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mov r2,#TAILLEBUF @ buffer size
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mov r7, #READ @ call system READ
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swi 0
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cmp r0,#0 @ read error ?
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ble erreur2
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mov r2,r0 @ length read characters
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/* close imput file */
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mov r0,r8 @ Fd
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mov r7, #CLOSE @ call system CLOSE
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swi 0
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cmp r0,#0 @ close error ?
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blt erreur1
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@ create output file
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ldr r0,iAdrszNameFileOutput @ file name
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ldr r1,iFicMask1 @ flags
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mov r7, #CREATE @ call system create file
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swi 0
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cmp r0,#0 @ create error ?
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ble erreur4
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mov r0,r8 @ file descriptor
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ldr r1,iAdrsBuffer
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@ et r2 contains the length to write
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mov r7, #WRITE @ select system call 'write'
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swi #0 @ perform the system call
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cmp r0,#0 @ error write ?
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blt erreur3
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@ close output file
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mov r0,r8 @ Fd fichier
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mov r7, #CLOSE @ call system CLOSE
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swi #0
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cmp r0,#0 @ error close ?
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blt erreur1
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mov r0,#0 @ return code OK
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b 100f
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erreur:
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ldr r1,iAdrszMessErreur
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bl afficheerreur
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mov r0,#1 @ error return code
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b 100f
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erreur1:
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ldr r1,iAdrszMessErreur1
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bl afficheerreur
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mov r0,#1 @ error return code
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b 100f
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erreur2:
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ldr r1,iAdrszMessErreur2
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bl afficheerreur
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mov r0,#1 @ error return code
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b 100f
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erreur3:
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ldr r1,iAdrszMessErreur3
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bl afficheerreur
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mov r0,#1 @ error return code
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b 100f
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erreur4:
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ldr r1,iAdrszMessErreur4
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bl afficheerreur
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mov r0,#1 @ error return code
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b 100f
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100: @ end program
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pop {fp,lr} /* restaur des 2 registres */
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mov r7, #EXIT /* appel fonction systeme pour terminer */
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swi 0
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iAdrszNameFileInput: .int szNameFileInput
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iAdrszNameFileOutput: .int szNameFileOutput
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iAdrszMessErreur: .int szMessErreur
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iAdrszMessErreur1: .int szMessErreur1
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iAdrszMessErreur2: .int szMessErreur2
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iAdrszMessErreur3: .int szMessErreur3
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iAdrszMessErreur4: .int szMessErreur4
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iAdrsBuffer: .int sBuffer
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iFicMask1: .octa 0644
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/******************************************************************/
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/* display text with size calculation */
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/******************************************************************/
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/* r0 contains the address of the message */
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affichageMess:
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push {r0,r1,r2,r7,lr} /* save registres */
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mov r2,#0 /* counter length */
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1: /* loop length calculation */
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ldrb r1,[r0,r2] /* read octet start position + index */
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cmp r1,#0 /* if 0 its over */
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addne r2,r2,#1 /* else add 1 in the length */
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bne 1b /* and loop */
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/* so here r2 contains the length of the message */
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mov r1,r0 /* address message in r1 */
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mov r0,#STDOUT /* code to write to the standard output Linux */
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mov r7, #WRITE /* code call system "write" */
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swi #0 /* call systeme */
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pop {r0,r1,r2,r7,lr} /* restaur des 2 registres */
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bx lr /* return */
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/***************************************************/
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/* display error message */
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/***************************************************/
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/* r0 contains error code r1 address error message */
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afficheerreur:
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push {r1-r2,lr} @ save registers
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mov r2,r0 @ save error code
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mov r0,r1 @ address error message
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bl affichageMess @ display error message
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mov r0,r2 @ error code
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ldr r1,iAdrsDeci @ result address
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bl conversion10S
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ldr r0,iAdrszMessErr @ display error code
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bl affichageMess
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pop {r1-r2,lr} @ restaur registers
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bx lr @ return function
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iAdrszMessErr: .int szMessErr
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iAdrsDeci: .int sDeci
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/***************************************************/
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/* Converting a register to a signed decimal */
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/***************************************************/
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/* r0 contains value and r1 area address */
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conversion10S:
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push {r0-r4,lr} @ save registers
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mov r2,r1 /* debut zone stockage */
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mov r3,#'+' /* par defaut le signe est + */
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cmp r0,#0 @ negative number ?
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movlt r3,#'-' @ yes
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mvnlt r0,r0 @ number inversion
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addlt r0,#1
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mov r4,#10 @ length area
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1: @ start loop
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bl divisionPar10R
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add r1,#48 @ digit
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strb r1,[r2,r4] @ store digit on area
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sub r4,r4,#1 @ previous position
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cmp r0,#0 @ stop if quotient = 0
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bne 1b
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strb r3,[r2,r4] @ store signe
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subs r4,r4,#1 @ previous position
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blt 100f @ if r4 < 0 -> end
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mov r1,#' ' @ space
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2:
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strb r1,[r2,r4] @store byte space
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subs r4,r4,#1 @ previous position
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bge 2b @ loop if r4 > 0
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100:
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pop {r0-r4,lr} @ restaur registers
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bx lr
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/***************************************************/
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/* division for 10 fast unsigned */
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/***************************************************/
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@ r0 contient le dividende
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@ r0 retourne le quotient
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@ r1 retourne le reste
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divisionPar10R:
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push {r2,lr} @ save registers
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sub r1, r0, #10 @ calcul de r0 - 10
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sub r0, r0, r0, lsr #2 @ calcul de r0 - (r0 /4)
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add r0, r0, r0, lsr #4 @ calcul de (r0-(r0/4))+ ((r0-(r0/4))/16
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add r0, r0, r0, lsr #8 @ etc ...
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add r0, r0, r0, lsr #16
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mov r0, r0, lsr #3
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add r2, r0, r0, asl #2
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subs r1, r1, r2, asl #1 @ calcul (N-10) - (N/10)*10
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addpl r0, r0, #1 @ regul quotient
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addmi r1, r1, #10 @ regul reste
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pop {r2,lr}
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bx lr
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