Null object: Difference between revisions
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m (→{{header|Nim}}) |
(Add task to ARM assembly Raspberry pi) |
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display dialog "x is null" |
display dialog "x is null" |
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end if</lang> |
end if</lang> |
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=={{header|ARM Assembly}}== |
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{{works with|as|Raspberry Pi}} |
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<lang ARM Assembly> |
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/* ARM assembly Raspberry PI */ |
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/* program nullobj.s */ |
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/* Constantes */ |
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.equ STDIN, 0 @ Linux input console |
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.equ STDOUT, 1 @ Linux output console |
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.equ EXIT, 1 @ Linux syscall |
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.equ READ, 3 @ Linux syscall |
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.equ WRITE, 4 @ Linux syscall |
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/* Initialized data */ |
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.data |
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szCarriageReturn: .asciz "\n" |
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szMessResult: .ascii "Value is null.\n" @ message result |
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iPtrObjet: .int 0 @ objet pointer |
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/* UnInitialized data */ |
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.bss |
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/* code section */ |
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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,iAdriPtrObjet @ load pointer address |
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ldr r0,[r0] @ load pointer value |
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cmp r0,#0 @ is null ? |
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ldreq r0,iAdrszMessResult @ yes -> display message |
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bleq affichageMess |
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100: @ standard end of the program |
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mov r0, #0 @ return code |
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pop {fp,lr} @ restaur 2 registers |
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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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iAdrszMessResult: .int szMessResult |
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iAdrszCarriageReturn: .int szCarriageReturn |
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iAdriPtrObjet: .int iPtrObjet |
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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 des 2 registres */ |
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bx lr @ return |
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</lang> |
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=={{header|AutoHotkey}}== |
=={{header|AutoHotkey}}== |