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Task/Time-a-function/ARM-Assembly/time-a-function.arm
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Task/Time-a-function/ARM-Assembly/time-a-function.arm
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/* ARM assembly Raspberry PI */
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/* program fcttime.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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.equ N1, 1000000 @ loop number
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.equ NBMEASURE, 10 @ measure number
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/*********************************/
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/* Initialized data */
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/*********************************/
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.data
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szMessError: .asciz "Error detected !!!!. \n"
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szMessSep: .asciz "****************************\n"
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szMessTemps: .ascii "Function time : "
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sSecondes: .fill 10,1,' '
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.ascii " s "
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sMicroS: .fill 10,1,' '
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.asciz " micros\n"
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szCarriageReturn: .asciz "\n"
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/*********************************/
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/* UnInitialized data */
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/*********************************/
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.bss
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.align 4
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dwDebut: .skip 8
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dwFin: .skip 8
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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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adr r0,mult @ function address to measure
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mov r1,#1 @ parameter 1 function
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mov r2,#2 @ parameter 2 function
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bl timeMesure
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cmp r0,#0
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blt 99f
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adr r0,sum @ function address to measure
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mov r1,#1
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mov r2,#2
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bl timeMesure
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cmp r0,#0
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blt 99f
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b 100f
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99:
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@ error
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ldr r0,iAdrszMessError
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bl affichageMess
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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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iAdrszMessError: .int szMessError
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iAdrszCarriageReturn: .int szCarriageReturn
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/**************************************************************/
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/* examble function sum */
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/**************************************************************/
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/* r0 contains op 1 */
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/* r1 contains op 2 */
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sum:
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push {lr} @ save registres
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add r0,r1
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100:
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pop {lr} @ restaur registers
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bx lr @ function return
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/**************************************************************/
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/* exemple execution multiplication */
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/**************************************************************/
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/* r0 contains op 1 */
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/* r1 contains op 2 */
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mult:
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push {lr} @ save registres
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mul r0,r1,r0
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100:
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pop {lr} @ restaur registers
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bx lr @ function return
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/**************************************************************/
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/* Procedure for measuring the execution time of a routine */
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/**************************************************************/
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/* r0 contains the function address */
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timeMesure:
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push {r1-r8,lr} @ save registres
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mov r4,r0 @ save function address
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mov r5,r1 @ save param 1
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mov r6,r2 @ save param 2
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mov r8,#0
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1:
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ldr r0,iAdrdwDebut @ start time area
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mov r1,#0
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mov r7, #0x4e @ call system gettimeofday
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svc #0
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cmp r0,#0 @ error ?
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blt 100f @ return error
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ldr r7,iMax @ run number
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mov r0,r5 @ param function 1
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mov r1,r6 @ param function 2
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2: @ loop
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blx r4 @ call of the function to be measured
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subs r7,#1 @ decrement run
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bge 2b @ loop if not zero
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@
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ldr r0,iAdrdwFin @ end time area
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mov r1,#0
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mov r7, #0x4e @ call system gettimeofday
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svc #0
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cmp r0,#0 @ error ?
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blt 100f @ return error
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@ compute time
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ldr r0,iAdrdwDebut @ start time area
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//vidmemtit mesure r0 2
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ldr r2,[r0] @ secondes
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ldr r3,[r0,#4] @ micro secondes
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ldr r0,iAdrdwFin @ end time area
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ldr r1,[r0] @ secondes
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ldr r0,[r0,#4] @ micro secondes
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sub r2,r1,r2 @ secondes number
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subs r3,r0,r3 @ microsecondes number
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sublt r2,#1 @ if negative sub 1 seconde to secondes
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ldr r1,iSecMicro
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addlt r3,r1 @ and add 1000000 to microsecondes number
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mov r0,r2 @ conversion secondes
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ldr r1,iAdrsSecondes
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bl conversion10
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mov r0,r3 @ conversion microsecondes
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ldr r1,iAdrsMicroS
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bl conversion10
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ldr r0,iAdrszMessTemps
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bl affichageMess @ display message
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add r8,#1
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cmp r8,#NBMEASURE
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ble 1b
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ldr r0,iAdrszMessSep @ display separator
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bl affichageMess
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100:
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pop {r1-r8,lr} @ restaur registers
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bx lr @ function return
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iMax: .int N1
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iAdrdwDebut: .int dwDebut
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iAdrdwFin: .int dwFin
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iSecMicro: .int 1000000
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iAdrsSecondes: .int sSecondes
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iAdrsMicroS: .int sMicroS
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iAdrszMessTemps: .int szMessTemps
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iAdrszMessSep: .int szMessSep
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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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/******************************************************************/
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/* Converting a register to a decimal */
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/******************************************************************/
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/* r0 contains value and r1 address area */
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.equ LGZONECAL, 10
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conversion10:
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push {r1-r4,lr} @ save registers
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mov r3,r1
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mov r2,#LGZONECAL
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1: @ start loop
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bl divisionpar10 @ r0 <- dividende. quotient ->r0 reste -> r1
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add r1,#48 @ digit
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strb r1,[r3,r2] @ store digit on area
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cmp r0,#0 @ stop if quotient = 0
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subne r2,#1 @ previous position
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bne 1b @ else loop
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@ end replaces digit in front of area
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mov r4,#0
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2:
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ldrb r1,[r3,r2]
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strb r1,[r3,r4] @ store in area begin
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add r4,#1
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add r2,#1 @ previous position
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cmp r2,#LGZONECAL @ end
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ble 2b @ loop
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mov r1,#' '
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3:
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strb r1,[r3,r4]
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add r4,#1
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cmp r4,#LGZONECAL @ end
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ble 3b
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100:
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pop {r1-r4,lr} @ restaur registres
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bx lr @return
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/***************************************************/
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/* division par 10 signé */
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/* Thanks to http://thinkingeek.com/arm-assembler-raspberry-pi/*
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/* and http://www.hackersdelight.org/ */
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/***************************************************/
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/* r0 dividende */
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/* r0 quotient */
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/* r1 remainder */
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divisionpar10:
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/* r0 contains the argument to be divided by 10 */
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push {r2-r4} @ save registers */
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mov r4,r0
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mov r3,#0x6667 @ r3 <- magic_number lower
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movt r3,#0x6666 @ r3 <- magic_number upper
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smull r1, r2, r3, r0 @ r1 <- Lower32Bits(r1*r0). r2 <- Upper32Bits(r1*r0)
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mov r2, r2, ASR #2 @ r2 <- r2 >> 2
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mov r1, r0, LSR #31 @ r1 <- r0 >> 31
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add r0, r2, r1 @ r0 <- r2 + r1
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add r2,r0,r0, lsl #2 @ r2 <- r0 * 5
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sub r1,r4,r2, lsl #1 @ r1 <- r4 - (r2 * 2) = r4 - (r0 * 10)
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pop {r2-r4}
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bx lr @ return
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