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Ingy döt Net
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/* ARM assembly Raspberry PI */
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/* program createXml.s */
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/* install package libxml++2.6-dev */
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/* link with gcc option -lxml2 */
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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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/*********************************/
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/* Initialized data */
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/*********************************/
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.data
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szMessEndpgm: .asciz "Normal end of program.\n"
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szFileName: .asciz "file1.xml"
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szFileMode: .asciz "w"
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szMessError: .asciz "Error detected !!!!. \n"
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szVersDoc: .asciz "1.0"
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szLibRoot: .asciz "root"
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szLibElement: .asciz "element"
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szText: .asciz "some text here"
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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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/*********************************/
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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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ldr r0,iAdrszVersDoc
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bl xmlNewDoc @ create doc
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mov r9,r0 @ doc address
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mov r0,#0
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ldr r1,iAdrszLibRoot
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bl xmlNewNode @ create root node
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mov r8,r0 @ node root address
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mov r0,r9
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mov r1,r8
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bl xmlDocSetRootElement
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@TODO voir la gestion des erreurs
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mov r0,#0
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ldr r1,iAdrszLibElement
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bl xmlNewNode @ create element node
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mov r7,r0 @ node element address
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ldr r0,iAdrszText
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bl xmlNewText @ create text
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mov r6,r0 @ text address
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mov r0,r7 @ node element address
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mov r1,r6 @ text address
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bl xmlAddChild @ add text to element node
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mov r0,r8 @ node root address
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mov r1,r7 @ node element address
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bl xmlAddChild @ add node elemeny to root node
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ldr r0,iAdrszFileName
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ldr r1,iAdrszFileMode
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bl fopen @ file open
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cmp r0,#0
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blt 99f
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mov r5,r0 @ File descriptor
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mov r1,r9 @ doc
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mov r2,r8 @ root
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bl xmlElemDump @ write xml file
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cmp r0,#0
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blt 99f
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mov r0,r5
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bl fclose @ file close
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mov r0,r9
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bl xmlFreeDoc
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bl xmlCleanupParser
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ldr r0,iAdrszMessEndpgm
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bl affichageMess
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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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iAdrszMessEndpgm: .int szMessEndpgm
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iAdrszVersDoc: .int szVersDoc
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iAdrszLibRoot: .int szLibRoot
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iAdrszLibElement: .int szLibElement
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iAdrszText: .int szText
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iAdrszFileName: .int szFileName
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iAdrszFileMode: .int szFileMode
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iAdrszCarriageReturn: .int szCarriageReturn
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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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