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September Morn Update

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Ingy döt Net 2019-09-12 10:33:56 -07:00
parent 4e2d22a71d
commit aac6731f2c
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Task/Order-two-numerical-lists/ARM-Assembly/order-two-numerical-lists.arm Normal file
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/* ARM assembly Raspberry PI */
/* program orderlist.s */
/* Constantes */
.equ STDOUT, 1 @ Linux output console
.equ EXIT, 1 @ Linux syscall
.equ WRITE, 4 @ Linux syscall
/*********************************/
/* Initialized data */
/*********************************/
.data
szMessResult1: .asciz "List1 < List2 \n" @ message result
szMessResult2: .asciz "List1 => List2 \n" @ message result
szCarriageReturn: .asciz "\n"
iTabList1: .int 1,2,3,4,5
.equ NBELEMENTS1, (. - iTabList1) /4
iTabList2: .int 1,2,1,5,2,2
.equ NBELEMENTS2, (. - iTabList2) /4
iTabList3: .int 1,2,3,4,5
.equ NBELEMENTS3, (. - iTabList3) /4
iTabList4: .int 1,2,3,4,5,6
.equ NBELEMENTS4, (. - iTabList4) /4
/*********************************/
/* UnInitialized data */
/*********************************/
.bss
/*********************************/
/* code section */
/*********************************/
.text
.global main
main: @ entry of program
ldr r0,iAdriTabList1
mov r1,#NBELEMENTS1
ldr r2,iAdriTabList2
mov r3,#NBELEMENTS2
bl listeOrder
cmp r0,#0 @ false ?
beq 1f @ yes
ldr r0,iAdrszMessResult1 @ list 1 < list 2
bl affichageMess @ display message
b 2f
1:
ldr r0,iAdrszMessResult2
bl affichageMess @ display message
2:
ldr r0,iAdriTabList1
mov r1,#NBELEMENTS1
ldr r2,iAdriTabList3
mov r3,#NBELEMENTS3
bl listeOrder
cmp r0,#0 @ false ?
beq 3f @ yes
ldr r0,iAdrszMessResult1 @ list 1 < list 2
bl affichageMess @ display message
b 4f
3:
ldr r0,iAdrszMessResult2
bl affichageMess @ display message
4:
ldr r0,iAdriTabList1
mov r1,#NBELEMENTS1
ldr r2,iAdriTabList4
mov r3,#NBELEMENTS4
bl listeOrder
cmp r0,#0 @ false ?
beq 5f @ yes
ldr r0,iAdrszMessResult1 @ list 1 < list 2
bl affichageMess @ display message
b 6f
5:
ldr r0,iAdrszMessResult2
bl affichageMess @ display message
6:
100: @ standard end of the program
mov r0, #0 @ return code
mov r7, #EXIT @ request to exit program
svc #0 @ perform the system call
iAdriTabList1: .int iTabList1
iAdriTabList2: .int iTabList2
iAdriTabList3: .int iTabList3
iAdriTabList4: .int iTabList4
iAdrszMessResult1: .int szMessResult1
iAdrszMessResult2: .int szMessResult2
iAdrszCarriageReturn: .int szCarriageReturn
/******************************************************************/
/* display text with size calculation */
/******************************************************************/
/* r0 contains the address of list 1 */
/* r1 contains list 1 size */
/* r2 contains the address of list 2 */
/* r3 contains list 2 size */
/* r0 returns 1 if list1 < list2 */
/* r0 returns 0 else */
listeOrder:
push {r1-r7,lr} @ save registres
cmp r1,#0 @ list 1 size = zero ?
moveq r0,#-1 @ yes -> error
beq 100f
cmp r3,#0 @ list 2 size = zero ?
moveq r0,#-2 @ yes -> error
beq 100f
mov r4,#0 @ index list 1
mov r5,#0 @ index list 2
1:
ldr r6,[r0,r4,lsl #2] @ load list 1 element
ldr r7,[r2,r5,lsl #2] @ load list 2 element
cmp r6,r7 @ compar
movgt r0,#0 @ list 1 > list 2 ?
bgt 100f
beq 2f @ list 1 = list 2
add r4,#1 @ increment index 1
cmp r4,r1 @ end list ?
movge r0,#1 @ yes -> ok list 1 < list 2
bge 100f
b 1b @ else loop
2:
add r4,#1 @ increment index 1
cmp r4,r1 @ end list ?
bge 3f @ yes -> verif size
add r5,#1 @ else increment index 2
cmp r5,r3 @ end list 2 ?
movge r0,#0 @ yes -> list 2 < list 1
bge 100f
b 1b @ else loop
3:
cmp r1,r3 @ compar size
movge r0,#0 @ list 2 < list 1
movlt r0,#1 @ list 1 < list 2
100:
pop {r1-r7,lr} @ restaur registers
bx lr @ return
/******************************************************************/
/* display text with size calculation */
/******************************************************************/
/* r0 contains the address of the message */
affichageMess:
push {r0,r1,r2,r7,lr} @ save registres
mov r2,#0 @ counter length
1: @ loop length calculation
ldrb r1,[r0,r2] @ read octet start position + index
cmp r1,#0 @ if 0 its over
addne r2,r2,#1 @ else add 1 in the length
bne 1b @ and loop
@ so here r2 contains the length of the message
mov r1,r0 @ address message in r1
mov r0,#STDOUT @ code to write to the standard output Linux
mov r7, #WRITE @ code call system "write"
svc #0 @ call systeme
pop {r0,r1,r2,r7,lr} @ restaur registers */
bx lr @ return