155 lines
6.2 KiB
Plaintext
155 lines
6.2 KiB
Plaintext
/* ARM assembly Raspberry PI */
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/* program orderlist.s */
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/* Constantes */
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.equ STDOUT, 1 @ Linux output console
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.equ EXIT, 1 @ Linux syscall
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.equ WRITE, 4 @ Linux syscall
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/*********************************/
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/* Initialized data */
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/*********************************/
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.data
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szMessResult1: .asciz "List1 < List2 \n" @ message result
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szMessResult2: .asciz "List1 => List2 \n" @ message result
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szCarriageReturn: .asciz "\n"
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iTabList1: .int 1,2,3,4,5
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.equ NBELEMENTS1, (. - iTabList1) /4
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iTabList2: .int 1,2,1,5,2,2
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.equ NBELEMENTS2, (. - iTabList2) /4
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iTabList3: .int 1,2,3,4,5
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.equ NBELEMENTS3, (. - iTabList3) /4
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iTabList4: .int 1,2,3,4,5,6
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.equ NBELEMENTS4, (. - iTabList4) /4
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/*********************************/
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/* UnInitialized data */
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/*********************************/
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.bss
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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,iAdriTabList1
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mov r1,#NBELEMENTS1
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ldr r2,iAdriTabList2
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mov r3,#NBELEMENTS2
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bl listeOrder
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cmp r0,#0 @ false ?
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beq 1f @ yes
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ldr r0,iAdrszMessResult1 @ list 1 < list 2
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bl affichageMess @ display message
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b 2f
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1:
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ldr r0,iAdrszMessResult2
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bl affichageMess @ display message
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2:
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ldr r0,iAdriTabList1
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mov r1,#NBELEMENTS1
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ldr r2,iAdriTabList3
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mov r3,#NBELEMENTS3
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bl listeOrder
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cmp r0,#0 @ false ?
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beq 3f @ yes
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ldr r0,iAdrszMessResult1 @ list 1 < list 2
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bl affichageMess @ display message
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b 4f
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3:
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ldr r0,iAdrszMessResult2
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bl affichageMess @ display message
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4:
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ldr r0,iAdriTabList1
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mov r1,#NBELEMENTS1
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ldr r2,iAdriTabList4
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mov r3,#NBELEMENTS4
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bl listeOrder
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cmp r0,#0 @ false ?
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beq 5f @ yes
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ldr r0,iAdrszMessResult1 @ list 1 < list 2
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bl affichageMess @ display message
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b 6f
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5:
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ldr r0,iAdrszMessResult2
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bl affichageMess @ display message
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6:
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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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iAdriTabList1: .int iTabList1
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iAdriTabList2: .int iTabList2
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iAdriTabList3: .int iTabList3
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iAdriTabList4: .int iTabList4
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iAdrszMessResult1: .int szMessResult1
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iAdrszMessResult2: .int szMessResult2
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iAdrszCarriageReturn: .int szCarriageReturn
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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 list 1 */
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/* r1 contains list 1 size */
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/* r2 contains the address of list 2 */
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/* r3 contains list 2 size */
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/* r0 returns 1 if list1 < list2 */
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/* r0 returns 0 else */
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listeOrder:
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push {r1-r7,lr} @ save registres
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cmp r1,#0 @ list 1 size = zero ?
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moveq r0,#-1 @ yes -> error
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beq 100f
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cmp r3,#0 @ list 2 size = zero ?
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moveq r0,#-2 @ yes -> error
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beq 100f
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mov r4,#0 @ index list 1
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mov r5,#0 @ index list 2
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1:
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ldr r6,[r0,r4,lsl #2] @ load list 1 element
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ldr r7,[r2,r5,lsl #2] @ load list 2 element
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cmp r6,r7 @ compar
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movgt r0,#0 @ list 1 > list 2 ?
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bgt 100f
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beq 2f @ list 1 = list 2
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add r4,#1 @ increment index 1
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cmp r4,r1 @ end list ?
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movge r0,#1 @ yes -> ok list 1 < list 2
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bge 100f
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b 1b @ else loop
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2:
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add r4,#1 @ increment index 1
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cmp r4,r1 @ end list ?
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bge 3f @ yes -> verif size
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add r5,#1 @ else increment index 2
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cmp r5,r3 @ end list 2 ?
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movge r0,#0 @ yes -> list 2 < list 1
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bge 100f
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b 1b @ else loop
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3:
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cmp r1,r3 @ compar size
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movge r0,#0 @ list 2 < list 1
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movlt r0,#1 @ list 1 < list 2
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100:
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pop {r1-r7,lr} @ restaur registers
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bx lr @ return
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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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svc #0 @ call systeme
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pop {r0,r1,r2,r7,lr} @ restaur registers */
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bx lr @ return
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