Last change
on this file since 125 was
105,
checked in by aitotat, 13 years ago
|
Changes to Assembly Library:
- More optimizations to reduce size.
- Removed some utility functions to reduce size.
|
File size:
1.5 KB
|
Line | |
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1 | ; Project name : Assembly Library |
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2 | ; Description : Register related macros. |
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3 | %ifndef REGISTERS_INC |
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4 | %define REGISTERS_INC |
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5 | |
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6 | ;-------------------------------------------------------------------- |
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7 | ; NORMALIZE_FAR_POINTER |
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8 | ; Parameters: |
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9 | ; %1:%2: Far pointer to normalize |
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10 | ; %3: Scratch register |
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11 | ; %4: Scratch register |
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12 | ; Returns: |
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13 | ; %1:%2: Normalized far pointer |
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14 | ; Corrupts registers: |
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15 | ; %3, %4 |
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16 | ;-------------------------------------------------------------------- |
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17 | %macro NORMALIZE_FAR_POINTER 4 |
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18 | mov %4, %2 ; Copy offset to scratch reg |
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19 | and %2, BYTE 0Fh ; Clear offset bits 15...4 |
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20 | eSHR_IM %4, 4 ; Divide offset by 16 |
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21 | mov %3, %1 ; Copy segment to scratch reg |
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22 | add %3, %4 ; Add shifted offset to segment |
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23 | mov %1, %3 ; Set normalized segment |
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24 | %endmacro |
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25 | |
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26 | |
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27 | ;-------------------------------------------------------------------- |
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28 | ; COPY_SSBP_TO_ESDI |
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29 | ; COPY_SSBP_TO_DSSI |
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30 | ; COPY_DSSI_TO_ESDI |
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31 | ; COPY_ESDI_to_DSSI |
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32 | ; Parameters |
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33 | ; Nothing |
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34 | ; Returns: |
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35 | ; Copies farm pointer to different segment/pointer register pair |
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36 | ; Corrupts registers: |
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37 | ; Nothing |
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38 | ;-------------------------------------------------------------------- |
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39 | %macro COPY_SSBP_TO_ESDI 0 |
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40 | push ss |
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41 | pop es |
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42 | mov di, bp |
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43 | %endmacro |
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44 | |
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45 | %macro COPY_SSBP_TO_DSSI 0 |
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46 | push ss |
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47 | pop ds |
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48 | mov si, bp |
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49 | %endmacro |
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50 | |
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51 | %macro COPY_DSSI_TO_ESDI 0 |
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52 | push ds |
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53 | pop es |
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54 | mov di, si |
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55 | %endmacro |
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56 | |
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57 | %macro COPY_ESDI_to_DSSI 0 |
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58 | push es |
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59 | pop ds |
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60 | mov si, di |
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61 | %endmacro |
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62 | |
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63 | |
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64 | |
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65 | %endif ; REGISTERS_INC |
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