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Multiplication tables: Difference between revisions
Add task to ARM assembly Raspberry pi
(Add task to ARM assembly Raspberry pi) |
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=={{header|ARM Assembly}}==
{{works with|as|Raspberry Pi}}
<lang ARM Assembly>
/* ARM assembly Raspberry PI */
/* program multtable.s */
/************************************/
/* Constantes */
/************************************/
.equ STDOUT, 1 @ Linux output console
.equ EXIT, 1 @ Linux syscall
.equ WRITE, 4 @ Linux syscall
.equ MAXI, 12
/*********************************/
/* Initialized data */
/*********************************/
.data
sMessValeur: .fill 11, 1, ' ' @ size => 11
szCarriageReturn: .asciz "\n"
sBlanc1: .asciz " "
sBlanc2: .asciz " "
sBlanc3: .asciz " "
/*********************************/
/* UnInitialized data */
/*********************************/
.bss
/*********************************/
/* code section */
/*********************************/
.text
.global main
main: @ entry of program
push {fp,lr} @ saves 2 registers
@ display first line
mov r4,#0
1: @ begin loop
mov r0,r4
ldr r1,iAdrsMessValeur @ display value
bl conversion10 @ call function
mov r2,#0 @ final zéro
strb r2,[r1,r0] @ on display value
ldr r0,iAdrsMessValeur
bl affichageMess @ display message
cmp r4,#10 @ one or two digit in résult
ldrgt r0,iAdrsBlanc2 @ two display two spaces
ldrle r0,iAdrsBlanc3 @ one display 3 spaces
bl affichageMess @ display message
add r4,#1 @ increment counter
cmp r4,#MAXI
ble 1b @ loop
ldr r0,iAdrszCarriageReturn
bl affichageMess @ display carriage return
mov r5,#1 @ line counter
2: @ begin loop lines
mov r0,r5 @ display column 1 with N° line
ldr r1,iAdrsMessValeur @ display value
bl conversion10 @ call function
mov r2,#0 @ final zéro
strb r2,[r1,r0]
ldr r0,iAdrsMessValeur
bl affichageMess @ display message
cmp r5,#10 @ one or two digit in N° line
ldrge r0,iAdrsBlanc2
ldrlt r0,iAdrsBlanc3
bl affichageMess
mov r4,#1 @ counter column
3: @ begin loop columns
mul r0,r4,r5 @ multiplication
mov r3,r0 @ save résult
ldr r1,iAdrsMessValeur @ display value
bl conversion10 @ call function
mov r2,#0
strb r2,[r1,r0]
ldr r0,iAdrsMessValeur
bl affichageMess @ display message
cmp r3,#100 @ 3 digits in résult ?
ldrge r0,iAdrsBlanc1 @ yes, display one space
bge 4f
cmp r3,#10 @ 2 digits in result
ldrge r0,iAdrsBlanc2 @ yes display 2 spaces
ldrlt r0,iAdrsBlanc3 @ no display 3 spaces
4:
bl affichageMess @ display message
add r4,#1 @ increment counter column
cmp r4,r5 @ < counter lines
ble 3b @ loop
ldr r0,iAdrszCarriageReturn
bl affichageMess @ display carriage return
add r5,#1 @ increment line counter
cmp r5,#MAXI @ MAXI ?
ble 2b @ loop
100: @ standard end of the program
mov r0, #0 @ return code
pop {fp,lr} @restaur 2 registers
mov r7, #EXIT @ request to exit program
svc #0 @ perform the system call
iAdrsMessValeur: .int sMessValeur
iAdrszCarriageReturn: .int szCarriageReturn
iAdrsBlanc1: .int sBlanc1
iAdrsBlanc2: .int sBlanc2
iAdrsBlanc3: .int sBlanc3
/******************************************************************/
/* 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 des 2 registres */
bx lr @ return
/******************************************************************/
/* Converting a register to a decimal unsigned */
/******************************************************************/
/* r0 contains value and r1 address area */
/* r0 return size of result (no zero final in area) */
/* area size => 11 bytes */
.equ LGZONECAL, 10
conversion10:
push {r1-r4,lr} @ save registers
mov r3,r1
mov r2,#LGZONECAL
1: @ start loop
bl divisionpar10U @unsigned r0 <- dividende. quotient ->r0 reste -> r1
add r1,#48 @ digit
strb r1,[r3,r2] @ store digit on area
cmp r0,#0 @ stop if quotient = 0 */
subne r2,#1 @ else previous position
bne 1b @ and loop
@ and move digit from left of area
mov r4,#0
2:
ldrb r1,[r3,r2]
strb r1,[r3,r4]
add r2,#1
add r4,#1
cmp r2,#LGZONECAL
ble 2b
@ and move spaces in end on area
mov r0,r4 @ result length
mov r1,#' ' @ space
3:
strb r1,[r3,r4] @ store space in area
add r4,#1 @ next position
cmp r4,#LGZONECAL
ble 3b @ loop if r4 <= area size
100:
pop {r1-r4,lr} @ restaur registres
bx lr @return
/***************************************************/
/* division par 10 unsigned */
/***************************************************/
/* r0 dividende */
/* r0 quotient */
/* r1 remainder */
divisionpar10U:
push {r2,r3,r4, lr}
mov r4,r0 @ save value
mov r3,#0xCCCD @ r3 <- magic_number lower
movt r3,#0xCCCC @ r3 <- magic_number upper
umull r1, r2, r3, r0 @ r1<- Lower32Bits(r1*r0) r2<- Upper32Bits(r1*r0)
mov r0, r2, LSR #3 @ r2 <- r2 >> shift 3
add r2,r0,r0, lsl #2 @ r2 <- r0 * 5
sub r1,r4,r2, lsl #1 @ r1 <- r4 - (r2 * 2) = r4 - (r0 * 10)
pop {r2,r3,r4,lr}
bx lr @ leave function
</lang>
=={{header|AutoHotkey}}==
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