180 lines
7.3 KiB
Plaintext
180 lines
7.3 KiB
Plaintext
/* ARM assembly Raspberry PI */
|
|
/* program insertList.s */
|
|
|
|
/* Constantes */
|
|
.equ STDOUT, 1 @ Linux output console
|
|
.equ EXIT, 1 @ Linux syscall
|
|
.equ READ, 3
|
|
.equ WRITE, 4
|
|
|
|
.equ NBELEMENTS, 100 @ list size
|
|
|
|
|
|
/*******************************************/
|
|
/* Structures */
|
|
/********************************************/
|
|
/* structure linkedlist*/
|
|
.struct 0
|
|
llist_next: @ next element
|
|
.struct llist_next + 4
|
|
llist_value: @ element value
|
|
.struct llist_value + 4
|
|
llist_fin:
|
|
/* Initialized data */
|
|
.data
|
|
szMessInitListe: .asciz "List initialized.\n"
|
|
szCarriageReturn: .asciz "\n"
|
|
/* datas error display */
|
|
szMessErreur: .asciz "Error detected.\n"
|
|
/* datas message display */
|
|
szMessResult: .ascii "Element No :"
|
|
sNumElement: .space 12,' '
|
|
.ascii " value : "
|
|
sValue: .space 12,' '
|
|
.asciz "\n"
|
|
|
|
/* UnInitialized data */
|
|
.bss
|
|
lList1: .skip llist_fin * NBELEMENTS @ list memory place
|
|
/* code section */
|
|
.text
|
|
.global main
|
|
main:
|
|
ldr r0,iAdrlList1
|
|
mov r1,#0 @ list init
|
|
str r1,[r0,#llist_next]
|
|
ldr r0,iAdrszMessInitListe
|
|
bl affichageMess
|
|
ldr r0,iAdrlList1
|
|
mov r1,#2
|
|
bl insertElement @ add element value 2
|
|
ldr r0,iAdrlList1
|
|
mov r1,#5
|
|
bl insertElement @ add element value 5
|
|
ldr r3,iAdrlList1
|
|
mov r2,#0 @ ident element
|
|
1:
|
|
ldr r0,[r3,#llist_next] @ end list ?
|
|
cmp r0,#0
|
|
beq 100f @ yes
|
|
add r2,#1
|
|
mov r0,r2 @ display No element and value
|
|
ldr r1,iAdrsNumElement
|
|
bl conversion10S
|
|
ldr r0,[r3,#llist_value]
|
|
ldr r1,iAdrsValue
|
|
bl conversion10S
|
|
ldr r0,iAdrszMessResult
|
|
bl affichageMess
|
|
ldr r3,[r3,#llist_next] @ next element
|
|
b 1b @ and loop
|
|
100: @ standard end of the program
|
|
mov r7, #EXIT @ request to exit program
|
|
svc 0 @ perform system call
|
|
iAdrszMessInitListe: .int szMessInitListe
|
|
iAdrszMessErreur: .int szMessErreur
|
|
iAdrszCarriageReturn: .int szCarriageReturn
|
|
iAdrlList1: .int lList1
|
|
iAdrszMessResult: .int szMessResult
|
|
iAdrsNumElement: .int sNumElement
|
|
iAdrsValue: .int sValue
|
|
|
|
/******************************************************************/
|
|
/* insert element at end of list */
|
|
/******************************************************************/
|
|
/* r0 contains the address of the list */
|
|
/* r1 contains the value of element */
|
|
/* r0 returns address of element or - 1 if error */
|
|
insertElement:
|
|
push {r1-r3,lr} @ save registers
|
|
mov r2,#llist_fin * NBELEMENTS
|
|
add r2,r0 @ compute address end list
|
|
1: @ start loop
|
|
ldr r3,[r0,#llist_next] @ load next pointer
|
|
cmp r3,#0 @ = zero
|
|
movne r0,r3 @ no -> loop with pointer
|
|
bne 1b
|
|
add r3,r0,#llist_fin @ yes -> compute next free address
|
|
cmp r3,r2 @ > list end
|
|
movge r0,#-1 @ yes -> error
|
|
bge 100f
|
|
str r3,[r0,#llist_next] @ store next address in current pointer
|
|
str r1,[r0,#llist_value] @ store element value
|
|
mov r1,#0
|
|
str r1,[r3,#llist_next] @ init next pointer in next address
|
|
|
|
100:
|
|
pop {r1-r3,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 registers
|
|
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 system
|
|
pop {r0,r1,r2,r7,lr} @ restaur registers
|
|
bx lr @ return
|
|
/***************************************************/
|
|
/* Converting a register to a signed decimal */
|
|
/***************************************************/
|
|
/* r0 contains value and r1 area address */
|
|
conversion10S:
|
|
push {r0-r4,lr} @ save registers
|
|
mov r2,r1 @ debut zone stockage
|
|
mov r3,#'+' @ par defaut le signe est +
|
|
cmp r0,#0 @ negative number ?
|
|
movlt r3,#'-' @ yes
|
|
mvnlt r0,r0 @ number inversion
|
|
addlt r0,#1
|
|
mov r4,#10 @ length area
|
|
1: @ start loop
|
|
bl divisionpar10U
|
|
add r1,#48 @ digit
|
|
strb r1,[r2,r4] @ store digit on area
|
|
sub r4,r4,#1 @ previous position
|
|
cmp r0,#0 @ stop if quotient = 0
|
|
bne 1b
|
|
|
|
strb r3,[r2,r4] @ store signe
|
|
subs r4,r4,#1 @ previous position
|
|
blt 100f @ if r4 < 0 -> end
|
|
|
|
mov r1,#' ' @ space
|
|
2:
|
|
strb r1,[r2,r4] @store byte space
|
|
subs r4,r4,#1 @ previous position
|
|
bge 2b @ loop if r4 > 0
|
|
100:
|
|
pop {r0-r4,lr} @ restaur registers
|
|
bx lr
|
|
/***************************************************/
|
|
/* 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 raspberry 3
|
|
//movt r3,#0xCCCC @ r3 <- magic_number higter raspberry 3
|
|
ldr r3,iMagicNumber @ r3 <- magic_number raspberry 1 2
|
|
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
|
|
iMagicNumber: .int 0xCCCCCCCD
|