144 lines
5.2 KiB
Plaintext
144 lines
5.2 KiB
Plaintext
/* ARM assembly Raspberry PI */
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/* program permutation.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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/*********************************/
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/* Initialized data */
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/*********************************/
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.data
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sMessResult: .asciz "Value : @ \n"
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sMessCounter: .asciz "Permutations = @ \n"
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szCarriageReturn: .asciz "\n"
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.align 4
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TableNumber: .int 1,2,3
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.equ NBELEMENTS, (. - TableNumber) / 4
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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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ldr r0,iAdrTableNumber @ address number table
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mov r1,#NBELEMENTS @ number of élements
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mov r10,#0 @ counter
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bl heapIteratif
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mov r0,r10 @ display counter
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ldr r1,iAdrsZoneConv @
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bl conversion10S @ décimal conversion
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ldr r0,iAdrsMessCounter
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ldr r1,iAdrsZoneConv @ insert conversion
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bl strInsertAtCharInc
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bl affichageMess @ display message
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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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iAdrsMessResult: .int sMessResult
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iAdrTableNumber: .int TableNumber
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iAdrsMessCounter: .int sMessCounter
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/******************************************************************/
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/* permutation by heap iteratif (wikipedia) */
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/******************************************************************/
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/* r0 contains the address of table */
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/* r1 contains the eléments number */
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heapIteratif:
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push {r3-r9,lr} @ save registers
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lsl r9,r1,#2 @ four bytes by count
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sub sp,sp,r9
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mov fp,sp
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mov r3,#0
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mov r4,#0 @ index
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1: @ init area counter
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str r4,[fp,r3,lsl #2]
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add r3,r3,#1
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cmp r3,r1
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blt 1b
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bl displayTable
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add r10,r10,#1
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mov r3,#0 @ index
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2:
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ldr r4,[fp,r3,lsl #2] @ load count [i]
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cmp r4,r3 @ compare with i
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bge 5f
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tst r3,#1 @ even ?
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bne 3f
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ldr r5,[r0] @ yes load value A[0]
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ldr r6,[r0,r3,lsl #2] @ and swap with value A[i]
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str r6,[r0]
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str r5,[r0,r3,lsl #2]
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b 4f
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3:
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ldr r5,[r0,r4,lsl #2] @ load value A[count[i]]
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ldr r6,[r0,r3,lsl #2] @ and swap with value A[i]
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str r6,[r0,r4,lsl #2]
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str r5,[r0,r3,lsl #2]
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4:
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bl displayTable
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add r10,r10,#1
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add r4,r4,#1 @ increment count i
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str r4,[fp,r3,lsl #2] @ and store on stack
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mov r3,#0 @ raz index
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b 2b @ and loop
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5:
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mov r4,#0 @ raz count [i]
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str r4,[fp,r3,lsl #2]
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add r3,r3,#1 @ increment index
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cmp r3,r1 @ end ?
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blt 2b @ no -> loop
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add sp,sp,r9 @ stack alignement
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100:
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pop {r3-r9,lr}
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bx lr @ return
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/******************************************************************/
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/* Display table elements */
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/******************************************************************/
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/* r0 contains the address of table */
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displayTable:
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push {r0-r3,lr} @ save registers
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mov r2,r0 @ table address
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mov r3,#0
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1: @ loop display table
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ldr r0,[r2,r3,lsl #2]
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ldr r1,iAdrsZoneConv @
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bl conversion10S @ décimal conversion
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ldr r0,iAdrsMessResult
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ldr r1,iAdrsZoneConv @ insert conversion
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bl strInsertAtCharInc
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bl affichageMess @ display message
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add r3,#1
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cmp r3,#NBELEMENTS - 1
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ble 1b
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ldr r0,iAdrszCarriageReturn
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bl affichageMess
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mov r0,r2
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100:
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pop {r0-r3,lr}
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bx lr
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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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