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Rev | Author | Line No. | Line |
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5728 | serge | 1 | /* BraIA64.c -- Converter for IA-64 code |
2 | 2013-11-12 : Igor Pavlov : Public domain */ |
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3 | |||
4 | #include "Precomp.h" |
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5 | |||
6 | #include "Bra.h" |
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7 | |||
8 | static const Byte kBranchTable[32] = |
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9 | { |
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10 | 0, 0, 0, 0, 0, 0, 0, 0, |
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11 | 0, 0, 0, 0, 0, 0, 0, 0, |
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12 | 4, 4, 6, 6, 0, 0, 7, 7, |
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13 | 4, 4, 0, 0, 4, 4, 0, 0 |
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14 | }; |
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15 | |||
16 | SizeT IA64_Convert(Byte *data, SizeT size, UInt32 ip, int encoding) |
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17 | { |
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18 | SizeT i; |
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19 | if (size < 16) |
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20 | return 0; |
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21 | size -= 16; |
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22 | for (i = 0; i <= size; i += 16) |
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23 | { |
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24 | UInt32 instrTemplate = data[i] & 0x1F; |
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25 | UInt32 mask = kBranchTable[instrTemplate]; |
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26 | UInt32 bitPos = 5; |
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27 | int slot; |
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28 | for (slot = 0; slot < 3; slot++, bitPos += 41) |
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29 | { |
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30 | UInt32 bytePos, bitRes; |
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31 | UInt64 instruction, instNorm; |
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32 | int j; |
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33 | if (((mask >> slot) & 1) == 0) |
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34 | continue; |
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35 | bytePos = (bitPos >> 3); |
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36 | bitRes = bitPos & 0x7; |
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37 | instruction = 0; |
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38 | for (j = 0; j < 6; j++) |
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39 | instruction += (UInt64)data[i + j + bytePos] << (8 * j); |
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40 | |||
41 | instNorm = instruction >> bitRes; |
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42 | if (((instNorm >> 37) & 0xF) == 0x5 && ((instNorm >> 9) & 0x7) == 0) |
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43 | { |
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44 | UInt32 src = (UInt32)((instNorm >> 13) & 0xFFFFF); |
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45 | UInt32 dest; |
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46 | src |= ((UInt32)(instNorm >> 36) & 1) << 20; |
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47 | |||
48 | src <<= 4; |
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49 | |||
50 | if (encoding) |
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51 | dest = ip + (UInt32)i + src; |
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52 | else |
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53 | dest = src - (ip + (UInt32)i); |
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54 | |||
55 | dest >>= 4; |
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56 | |||
57 | instNorm &= ~((UInt64)(0x8FFFFF) << 13); |
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58 | instNorm |= ((UInt64)(dest & 0xFFFFF) << 13); |
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59 | instNorm |= ((UInt64)(dest & 0x100000) << (36 - 20)); |
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60 | |||
61 | instruction &= (1 << bitRes) - 1; |
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62 | instruction |= (instNorm << bitRes); |
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63 | for (j = 0; j < 6; j++) |
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64 | data[i + j + bytePos] = (Byte)(instruction >> (8 * j)); |
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65 | } |
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66 | } |
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67 | } |
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68 | return i; |
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69 | }>><>><>><>><>><>=><=>><>><>>>=>> |