ARM bubblesort

AREA BubbleSort, CODE, READONLY
    ENTRY

Start
    MOV r0, #0 ; array index being sorted
    MOV r12, #0; whether there haven't been any swaps
    ADR r1, DataStart ; get data start address
    ADR r2, DataEnd   ; get data end address
    MOV r12, #0
    ADD r5, r0, #4
    MOV r9, r1
    ADD r5, r9, #4
Loop
    LDR r3, [r9]
    LDR r4, [r5]
    CMP r3, r4
    STRGT r3, [r5]
    STRGT r4, [r9]
    MOVGT r12, #1
    ADD r9, r9, #4
    ADD r5, r9, #4
    CMP r2, r5
    BNE Loop
    CMP r12, #1
    BNE EndSort
    B Start
EndSort
    CMP r1, r2
    BEQ Stop
    LDR r0, [r1], #4
    SVC 2
    B EndSort
    ; **** One way to use the SVCs
    ; **** (as sub-routine calls to the SVCs)

DumpRegs
    SVC 1 ; debug command to dump all registers
    MOV pc, lr ; return to calling sub-routine

PrintR0
    SVC 2 ; debug command to printR0
    MOV pc, lr ; return to calling sub-routine

Stop
    BL DumpRegs ; print all the registers
    SVC 0 ; stop the emulator


; *** The data values to be sorted
; *** Multiple DCDs per line support NOT needed
DataStart
    DCD -4
    DCD 2
    DCD 5
    DCD 910
    DCD 10
    DCD -12
    DCD 91
    DCD 11
DataEnd
    END