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1 /* BraIA64.c -- Converter for IA-64 code
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2 2008-10-04 : Igor Pavlov : Public domain */
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3
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4 #include "Bra.h"
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5
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6 static const Byte kBranchTable[32] =
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7 {
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8 0, 0, 0, 0, 0, 0, 0, 0,
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9 0, 0, 0, 0, 0, 0, 0, 0,
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10 4, 4, 6, 6, 0, 0, 7, 7,
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11 4, 4, 0, 0, 4, 4, 0, 0
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12 };
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13
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14 SizeT IA64_Convert(Byte *data, SizeT size, UInt32 ip, int encoding)
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15 {
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16 SizeT i;
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17 if (size < 16)
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18 return 0;
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19 size -= 16;
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20 for (i = 0; i <= size; i += 16)
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21 {
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22 UInt32 instrTemplate = data[i] & 0x1F;
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23 UInt32 mask = kBranchTable[instrTemplate];
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24 UInt32 bitPos = 5;
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25 int slot;
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26 for (slot = 0; slot < 3; slot++, bitPos += 41)
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27 {
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28 UInt32 bytePos, bitRes;
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29 UInt64 instruction, instNorm;
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30 int j;
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31 if (((mask >> slot) & 1) == 0)
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32 continue;
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33 bytePos = (bitPos >> 3);
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34 bitRes = bitPos & 0x7;
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35 instruction = 0;
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36 for (j = 0; j < 6; j++)
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37 instruction += (UInt64)data[i + j + bytePos] << (8 * j);
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38
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39 instNorm = instruction >> bitRes;
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40 if (((instNorm >> 37) & 0xF) == 0x5 && ((instNorm >> 9) & 0x7) == 0)
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41 {
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42 UInt32 src = (UInt32)((instNorm >> 13) & 0xFFFFF);
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43 UInt32 dest;
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44 src |= ((UInt32)(instNorm >> 36) & 1) << 20;
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45
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46 src <<= 4;
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47
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48 if (encoding)
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49 dest = ip + (UInt32)i + src;
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50 else
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51 dest = src - (ip + (UInt32)i);
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52
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53 dest >>= 4;
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54
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55 instNorm &= ~((UInt64)(0x8FFFFF) << 13);
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56 instNorm |= ((UInt64)(dest & 0xFFFFF) << 13);
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57 instNorm |= ((UInt64)(dest & 0x100000) << (36 - 20));
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58
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59 instruction &= (1 << bitRes) - 1;
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60 instruction |= (instNorm << bitRes);
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61 for (j = 0; j < 6; j++)
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62 data[i + j + bytePos] = (Byte)(instruction >> (8 * j));
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63 }
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64 }
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65 }
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66 return i;
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67 }
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