Last change
on this file since 172 was
172,
checked in by aitotat@…, 13 years ago
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Changes to Assembly Library:
- Added 32/16bit and 64/16bit division functions.
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File size:
1.3 KB
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1 | ; Project name : Assembly Library |
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2 | ; Description : Functions for register operations. |
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3 | |
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4 | |
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5 | ; Section containing code |
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6 | SECTION .text |
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7 | |
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8 | ;-------------------------------------------------------------------- |
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9 | ; Math_DivQWatSSBPbyCX |
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10 | ; Parameters: |
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11 | ; [SS:BP]: 64-bit unsigned divident |
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12 | ; CX: 16-bit unsigned divisor |
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13 | ; Returns: |
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14 | ; [SS:BP]: 64-bit unsigned quotient |
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15 | ; DX: 16-bit unsigned remainder |
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16 | ; Corrupts registers: |
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17 | ; AX |
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18 | ;-------------------------------------------------------------------- |
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19 | ALIGN JUMP_ALIGN |
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20 | Math_DivQWatSSBPbyCX: |
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21 | xor dx, dx |
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22 | mov ax, [bp+6] ; Load highest divident WORD to DX:AX |
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23 | div cx |
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24 | mov [bp+6], ax ; Store quotient |
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25 | |
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26 | mov ax, [bp+4] |
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27 | div cx |
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28 | mov [bp+4], ax |
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29 | |
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30 | mov ax, [bp+2] |
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31 | div cx |
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32 | mov [bp+2], ax |
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33 | |
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34 | mov ax, [bp] |
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35 | div cx |
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36 | mov [bp], ax |
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37 | ret |
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38 | |
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39 | |
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40 | ;-------------------------------------------------------------------- |
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41 | ; Math_DivDXAXbyCX |
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42 | ; Parameters: |
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43 | ; DX:AX: 32-bit unsigned divident |
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44 | ; CX: 16-bit unsigned divisor |
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45 | ; Returns: |
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46 | ; DX:AX: 32-bit unsigned quotient |
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47 | ; BX: 16-bit unsigned remainder |
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48 | ; Corrupts registers: |
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49 | ; Nothing |
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50 | ;-------------------------------------------------------------------- |
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51 | ALIGN JUMP_ALIGN |
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52 | Math_DivDXAXbyCX: |
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53 | mov bx, ax |
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54 | mov ax, dx |
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55 | xor dx, dx |
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56 | div cx |
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57 | xchg ax, bx |
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58 | div cx |
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59 | xchg dx, bx |
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60 | ret |
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