[54] | 1 | ; File name : Registers.asm |
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| 2 | ; Project name : Assembly Library |
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| 3 | ; Created date : 24.10.2010 |
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| 4 | ; Last update : 24.10.2010 |
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| 5 | ; Author : Tomi Tilli |
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| 6 | ; Description : Functions for register operations. |
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| 7 | |
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| 8 | ; Section containing code |
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| 9 | SECTION .text |
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| 10 | |
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| 11 | ;-------------------------------------------------------------------- |
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| 12 | ; Registers_ExchangeDSSIwithESDI |
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| 13 | ; Parameters |
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| 14 | ; Nothing |
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| 15 | ; Returns: |
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| 16 | ; DS:SI and ES:DI are exchanged. |
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| 17 | ; Corrupts registers: |
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| 18 | ; Nothing |
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| 19 | ;-------------------------------------------------------------------- |
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| 20 | ALIGN JUMP_ALIGN |
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| 21 | Registers_ExchangeDSSIwithESDI: |
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| 22 | push ds |
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| 23 | push es |
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| 24 | pop ds |
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| 25 | pop es |
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| 26 | xchg si, di |
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| 27 | ret |
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| 28 | |
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| 29 | |
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| 30 | ;-------------------------------------------------------------------- |
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| 31 | ; Registers_CopySSBPtoESDI |
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| 32 | ; Registers_CopySSBPtoDSSI |
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| 33 | ; Registers_CopyDSSItoESDI |
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| 34 | ; Registers_CopyESDItoDSSI |
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| 35 | ; Parameters |
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| 36 | ; Nothing |
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| 37 | ; Returns: |
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| 38 | ; Copies farm pointer to different segment/pointer register pair |
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| 39 | ; Corrupts registers: |
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| 40 | ; Nothing |
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| 41 | ;-------------------------------------------------------------------- |
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| 42 | ALIGN JUMP_ALIGN |
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| 43 | Registers_CopySSBPtoESDI: |
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| 44 | push ss |
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| 45 | pop es |
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| 46 | mov di, bp |
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| 47 | ret |
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| 48 | |
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| 49 | ALIGN JUMP_ALIGN |
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| 50 | Registers_CopySSBPtoDSSI: |
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| 51 | push ss |
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| 52 | pop ds |
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| 53 | mov si, bp |
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| 54 | ret |
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| 55 | |
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| 56 | ALIGN JUMP_ALIGN |
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| 57 | Registers_CopyDSSItoESDI: |
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| 58 | push ds |
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| 59 | pop es |
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| 60 | mov di, si |
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| 61 | ret |
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| 62 | |
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| 63 | ALIGN JUMP_ALIGN |
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| 64 | Registers_CopyESDItoDSSI: |
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| 65 | push es |
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| 66 | pop ds |
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| 67 | mov si, di |
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| 68 | ret |
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| 69 | |
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| 70 | |
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| 71 | ;-------------------------------------------------------------------- |
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| 72 | ; Registers_SetZFifNullPointerInDSSI |
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| 73 | ; Parameters |
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| 74 | ; DS:SI: Far pointer |
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| 75 | ; Returns: |
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| 76 | ; ZF: Set if NULL pointer in DS:SI |
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| 77 | ; Corrupts registers: |
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| 78 | ; Nothing |
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| 79 | ;-------------------------------------------------------------------- |
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| 80 | ALIGN JUMP_ALIGN |
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| 81 | Registers_SetZFifNullPointerInDSSI: |
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| 82 | push ax |
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| 83 | mov ax, ds |
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| 84 | or ax, si |
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| 85 | pop ax |
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| 86 | ret |
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