1 | AREA MyData, DATA, align = 2
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2 | GLOBAL MeinNumFeld
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3 |
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4 |
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5 | MeinNumFeld DCD 0x22, 2_00111110, -52, 78, 0x60000000, 0x50000000
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6 |
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7 | MeinWordFeld DCW 0x1234, 0x5678, 0x9abc, 0xdef0
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8 |
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9 |
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10 | MeinTextFeld DCB "ABab0123"
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11 |
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12 |
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13 | MeinByteFeld DCB 0xef, 0xdc, 0xba, 0x98
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14 |
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15 | MeinBlock SPACE 0x20
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16 |
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17 | ;********************************************
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18 | ; Code section, aligned on 8-byte boundery
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19 | ;********************************************
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20 |
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21 | AREA MyCode, CODE, readonly, align = 2
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22 |
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23 | ;--------------------------------------------
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24 | ; main subroutine
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25 | ;--------------------------------------------
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26 | GLOBAL main
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27 |
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28 |
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29 | main PROC
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30 |
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31 |
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32 | ; ----------------------------------------------------------------------------------------
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33 | ; Laden von Konstanten in Register
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34 | ; ----------------------------------------------------------------------------------------
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35 | mov R0, #0x12 ;Anw-01 : Konstanten 0...255 (*4, *16, *64, ....)
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36 |
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37 | mov R1, #-2 ;Anw-02 : negative Konstanten 0...255 (*4, *16, *64, ....)
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38 |
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39 | ldr R2,=0xfe543210 ;Anw-03: beliebige 32-bit-Konstanten (Pseudobefehl !!!)
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40 |
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41 |
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42 | ; -----------------------------------------------------------------------------------------
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43 | ; Zugriff auf Variablen
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44 | ; -----------------------------------------------------------------------------------------
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45 |
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46 | ; --- Byte-, Halbword- und Wortzugriffe ---
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47 | ldr r0, =MeinByteFeld ; Anw-04: Lade die Startadresse des Bytefeldes
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48 | ldrb r1, [r0] ; Anw-05: Achtung: auch bei Byte- und Halbwort-Zugriffen
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49 | ldrh r2, [r0] ; Anw-06 wird immer das ganze Register verändert !!!!!
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50 | ldr r3, [r0] ; Anw-07
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51 |
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52 | ; --- einfache Feldzugriffe ---
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53 | ldr r4, =MeinWordFeld ; Anw-08: Lade die Adresse des Wortfeldes "MeinWortFeld"
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54 | ldr r5, [r4] ; Anw-09
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55 | ldr r6, [r4, #4] ; Anw-10: konstanter Offset
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56 |
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57 | ; --- Variablen (Worte) speichern ---
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58 | ldr r0, =0x123456ab ; Anw-11: Lade die Konstante (>255)
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59 | ldr r1, =MeinBlock ; Anw-12: Lade die Anfangsadresse von "MeinBlock"
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60 | str r0, [r1] ; Anw-13 (word-Befehl) Speicheradresse muss aligned sein !
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61 | str r0, [r1, #4] ; Anw-14 (word-Befehl) Speicheradresse muss aligned sein !
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62 |
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63 | ; --- Variablen (Byte) speichern ---
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64 | mov r2, #0x1a ; Anw-15
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65 | strb r2, [r1, #9] ; Anw-16 (byte-Befehl)
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66 | strb r2, [r1, #10] ; Anw-17 (byte-Befehl)
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67 |
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68 | ; -------------------------------------------------------------------------------------------
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69 | ; Ganzzahl-Addition und Flags
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70 | ; -------------------------------------------------------------------------------------------
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71 |
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72 | ldr r0,=MeinNumFeld ; Anw-18
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73 | ldr r1, [r0] ; Anw-19
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74 | ldr r2, [r0, #4] ; Anw-20
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75 |
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76 | adds r3, r1, r2 ; Anw-21
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77 |
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78 | ; ---------------------------------------------
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79 | ldr r0,=MeinNumFeld+8 ; Anw-22
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80 | ldr r1, [r0] ; Anw-23
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81 | ldr r2, [r0, #4] ; Anw-24
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82 |
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83 | adds r3, r1, r2 ; Anw-25
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84 |
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85 | ; ---------------------------------------------
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86 | ldr r0,=MeinNumFeld+16 ; Anw-26
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87 | ldr r1, [r0] ; Anw-27
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88 | ldr r2, [r0, #4] ; Anw-28
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89 |
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90 | adds r3, r1, r2 ; Anw-29
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91 |
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92 |
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93 | ; ------------------------------------------------------------------------------------------
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94 | ; Indirekte Adressierungsarten mit update
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95 | ; ------------------------------------------------------------------------------------------
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96 |
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97 | ldr r0,=MeinTextFeld ; Anw-30
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98 | ldrb r1, [r0, #1]! ; Anw-31
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99 | ldrb r1, [r0, #1]! ; Anw-32
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100 |
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101 | ldr r0,=MeinWordFeld ; Anw-33
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102 | ldr r2, [r0], #4 ; Anw-34
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103 | ldr r2, [r0], #4 ; Anw-35
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104 |
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105 |
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106 |
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107 |
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108 |
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109 |
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110 | forever b forever ; nowhere to retun if main ends
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111 | ENDP
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112 |
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113 | ALIGN 4
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114 | END
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