How to resolve the algorithm Date format step by step in the ARM Assembly programming language
Published on 12 May 2024 09:40 PM
How to resolve the algorithm Date format step by step in the ARM Assembly programming language
Table of Contents
Problem Statement
Display the current date in the formats of:
Let's start with the solution:
Step by Step solution about How to resolve the algorithm Date format step by step in the ARM Assembly programming language
Source code in the arm programming language
/* ARM assembly Raspberry PI */
/* program dateFormat.s */
/* REMARK 1 : this program use routines in a include file
see task Include a file language arm assembly
for the routine affichageMess conversion10
see at end of this program the instruction include */
/*******************************************/
/* Constantes */
/*******************************************/
.equ STDOUT, 1 @ Linux output console
.equ EXIT, 1 @ Linux syscall
.equ WRITE, 4 @ Linux syscall
.equ BRK, 0x2d @ Linux syscall
.equ CHARPOS, '@'
.equ GETTIME, 0x4e @ call system linux gettimeofday
/*******************************************/
/* Structures */
/********************************************/
/* example structure time */
.struct 0
timeval_sec: @
.struct timeval_sec + 4
timeval_usec: @
.struct timeval_usec + 4
timeval_end:
.struct 0
timezone_min: @
.struct timezone_min + 4
timezone_dsttime: @
.struct timezone_dsttime + 4
timezone_end:
/*********************************/
/* Initialized data */
/*********************************/
.data
szMessError: .asciz "Error detected !!!!. \n"
szMessResult: .asciz "Date : @/@/@ \n" @ message result
szMessResult1: .asciz "Date day : @ @ @ @ \n" @ message result
szJan: .asciz "Janvier"
szFev: .asciz "Février"
szMars: .asciz "Mars"
szAvril: .asciz "Avril"
szMai: .asciz "Mai"
szJuin: .asciz "Juin"
szJuil: .asciz "Juillet"
szAout: .asciz "Aout"
szSept: .asciz "Septembre"
szOct: .asciz "Octobre"
szNov: .asciz "Novembre"
szDec: .asciz "Décembre"
szLundi: .asciz "Lundi"
szMardi: .asciz "Mardi"
szMercredi: .asciz "Mercredi"
szJeudi: .asciz "Jeudi"
szVendredi: .asciz "Vendredi"
szSamedi: .asciz "Samedi"
szDimanche: .asciz "Dimanche"
szCarriageReturn: .asciz "\n"
.align 4
tbDayMonthYear: .int 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335
.int 366, 397, 425, 456, 486, 517, 547, 578, 609, 639, 670, 700
.int 731, 762, 790, 821, 851, 882, 912, 943, 974,1004,1035,1065
.int 1096,1127,1155,1186,1216,1247,1277,1308,1339,1369,1400,1430
tbMonthName: .int szJan
.int szFev
.int szMars
.int szAvril
.int szMai
.int szJuin
.int szJuil
.int szAout
.int szSept
.int szOct
.int szNov
.int szDec
tbDayName: .int szLundi
.int szMardi
.int szMercredi
.int szJeudi
.int szVendredi
.int szSamedi
.int szDimanche
/*********************************/
/* UnInitialized data */
/*********************************/
.bss
.align 4
stTVal: .skip timeval_end
stTZone: .skip timezone_end
sZoneConv: .skip 100
/*********************************/
/* code section */
/*********************************/
.text
.global main
main: @ entry of program
ldr r0,iAdrstTVal
ldr r1,iAdrstTZone
mov r7,#GETTIME
svc 0
cmp r0,#-1 @ error ?
beq 99f
ldr r1,iAdrstTVal
ldr r0,[r1,#timeval_sec] @ timestemp in second
bl dateFormatNum
ldr r0,[r1,#timeval_sec] @ timestemp in second
bl dateFormatAlpha
ldr r0,iTStest1
bl dateFormatNum
ldr r0,iTStest1
bl dateFormatAlpha
ldr r0,iTStest2
bl dateFormatNum
ldr r0,iTStest2
bl dateFormatAlpha
ldr r0,iTStest3
bl dateFormatNum
ldr r0,iTStest3
bl dateFormatAlpha
b 100f
99:
ldr r0,iAdrszMessError
bl affichageMess
100: @ standard end of the program
mov r0,#0 @ return code
mov r7,#EXIT @ request to exit program
svc 0 @ perform the system call
iAdrszMessError: .int szMessError
iAdrstTVal: .int stTVal
iAdrstTZone: .int stTZone
iAdrszCarriageReturn: .int szCarriageReturn
iAdrsZoneConv: .int sZoneConv
iTStest1: .int 1609508339 @ 01/01/2021
iTStest2: .int 1657805939 @ 14/07/2022
iTStest3: .int 1767221999 @ 31/12/2025
/******************************************************************/
/* date format numeric */
/******************************************************************/
/* r0 contains the timestamp in seconds */
dateFormatNum:
push {r1-r11,lr} @ save registers
ldr r2,iSecJan2020
sub r0,r0,r2 @ total secondes to 01/01/2020
mov r1,#60
bl division
mov r0,r2
mov r6,r3 @ compute secondes
mov r1,#60
bl division
mov r7,r3 @ compute minutes
mov r0,r2
mov r1,#24
bl division
mov r8,r3 @ compute hours
mov r0,r2
mov r11,r0
mov r1,#(365 * 4 + 1)
bl division
lsl r9,r2,#2 @ multiply by 4 = year1
mov r1,#(365 * 4 + 1)
mov r0,r11
bl division
mov r10,r3
ldr r1,iAdrtbDayMonthYear
mov r2,#3
mov r3,#12
1:
mul r11,r3,r2
ldr r4,[r1,r11,lsl #2] @ load days by year
cmp r10,r4
bge 2f
sub r2,r2,#1
cmp r2,#0
bne 1b
2: @ r2 = year2
mov r5,#11
mul r11,r3,r2
lsl r11,#2
add r11,r1 @ table address
3:
ldr r4,[r11,r5,lsl #2] @ load days by month
cmp r10,r4
bge 4f
subs r5,r5,#1
bne 3b
4: @ r5 = month - 1
mul r11,r3,r2
add r11,r5
ldr r1,iAdrtbDayMonthYear
ldr r3,[r1,r11,lsl #2]
sub r0,r10,r3
add r0,r0,#1 @ final compute day
ldr r1,iAdrsZoneConv
bl conversion10 @ this function do not zero final
mov r11,#0 @ store zero final
strb r11,[r1,r0]
ldr r0,iAdrszMessResult
ldr r1,iAdrsZoneConv
bl strInsertAtCharInc @ insert result at first @ character
mov r3,r0
add r0,r5,#1 @ final compute month
cmp r0,#12
subgt r0,#12
ldr r1,iAdrsZoneConv
bl conversion10
mov r11,#0 @ store zero final
strb r11,[r1,r0]
mov r0,r3
ldr r1,iAdrsZoneConv
bl strInsertAtCharInc @ insert result at next @ character
mov r3,r0
ldr r11,iYearStart
add r0,r9,r11
add r0,r0,r2 @ final compute year = 2020 + year1 + year2
ldr r1,iAdrsZoneConv
bl conversion10
mov r11,#0 @ store zero final
strb r11,[r1,r0]
mov r0,r3
ldr r1,iAdrsZoneConv
bl strInsertAtCharInc @ insert result at next @ character
bl affichageMess
100:
pop {r1-r11,lr} @ restaur registers
bx lr @ return
iAdrszMessResult: .int szMessResult
/******************************************************************/
/* date format alphanumeric */
/******************************************************************/
/* r0 contains the timestamp in seconds */
dateFormatAlpha:
push {r1-r10,lr} @ save registers
ldr r2,iSecJan2020
sub r0,r0,r2 @ total secondes to 01/01/2020
mov r6,r0
mov r1,#60
bl division
mov r0,r2
mov r1,#60
bl division
mov r0,r2
mov r1,#24
bl division
mov r0,r2
mov r8,r0
mov r1,#(365 * 4 + 1)
bl division
lsl r9,r2,#2 @ multiply by 4 = year1
mov r1,#(365 * 4 + 1)
mov r0,r8
bl division
mov r10,r3 @ reste
ldr r1,iAdrtbDayMonthYear
mov r7,#3
mov r3,#12
1:
mul r8,r3,r7
ldr r4,[r1,r8,lsl #2] @ load days by year
cmp r10,r4
bge 2f
sub r7,r7,#1
cmp r7,#0
bne 1b
2: @ r7 = year2
mov r5,#11
mul r8,r3,r7
lsl r8,#2
add r8,r1
3:
ldr r4,[r8,r5,lsl #2] @ load days by month
cmp r10,r4
bge 4f
subs r5,r5,#1
bne 3b
4: @ r5 = month - 1
mov r0,r6 @ number secondes depuis 01/01/2020
ldr r1,iNbSecByDay
bl division
mov r0,r2
mov r1,#7
bl division
add r2,r3,#2
cmp r2,#7
subge r2,#7
ldr r1,iAdrtbDayName
ldr r1,[r1,r2,lsl #2]
ldr r0,iAdrszMessResult1
bl strInsertAtCharInc @ insert result at next @ character
mov r3,r0
mov r8,#12
mul r11,r8,r7
add r11,r5
ldr r1,iAdrtbDayMonthYear
ldr r8,[r1,r11,lsl #2]
sub r0,r10,r8
add r0,r0,#1 @ final compute day
ldr r1,iAdrsZoneConv
bl conversion10 @ this function do not zero final
mov r8,#0 @ store zero final
strb r8,[r1,r0]
mov r0,r3
ldr r1,iAdrsZoneConv
bl strInsertAtCharInc @ insert result at first @ character
mov r3,r0
ldr r1,iAdrtbMonthName
cmp r5,#12
subge r5,#12
ldr r1,[r1,r5,lsl #2] @ month name
mov r0,r3
bl strInsertAtCharInc @ insert result at first @ character
mov r3,r0
ldr r0,iYearStart
add r0,r7
add r0,r9 @ final compute year = 2020 + year1 + year2
ldr r1,iAdrsZoneConv
bl conversion10 @ this function do not zero final
mov r8,#0 @ store zero final
strb r8,[r1,r0]
mov r0,r3
ldr r1,iAdrsZoneConv
bl strInsertAtCharInc @ insert result at first @ character
bl affichageMess
100:
pop {r1-r10,lr} @ restaur registers
bx lr @ return
iAdrszMessResult1: .int szMessResult1
iSecJan2020: .int 1577836800
iAdrtbDayMonthYear: .int tbDayMonthYear
iYearStart: .int 2020
iAdrtbMonthName: .int tbMonthName
iAdrtbDayName: .int tbDayName
iNbSecByDay: .int 3600 * 24
/***************************************************/
/* ROUTINES INCLUDE */
/***************************************************/
.include "../affichage.inc"
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