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69 lines
1.7 KiB
69 lines
1.7 KiB
/* BraIA64.c -- Converter for IA-64 code |
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2013-11-12 : Igor Pavlov : Public domain */ |
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#include "Precomp.h" |
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#include "Bra.h" |
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static const Byte kBranchTable[32] = |
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{ |
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0, 0, 0, 0, 0, 0, 0, 0, |
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0, 0, 0, 0, 0, 0, 0, 0, |
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4, 4, 6, 6, 0, 0, 7, 7, |
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4, 4, 0, 0, 4, 4, 0, 0 |
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}; |
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SizeT IA64_Convert(Byte *data, SizeT size, UInt32 ip, int encoding) |
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{ |
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SizeT i; |
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if (size < 16) |
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return 0; |
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size -= 16; |
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for (i = 0; i <= size; i += 16) |
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{ |
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UInt32 instrTemplate = data[i] & 0x1F; |
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UInt32 mask = kBranchTable[instrTemplate]; |
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UInt32 bitPos = 5; |
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int slot; |
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for (slot = 0; slot < 3; slot++, bitPos += 41) |
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{ |
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UInt32 bytePos, bitRes; |
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UInt64 instruction, instNorm; |
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int j; |
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if (((mask >> slot) & 1) == 0) |
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continue; |
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bytePos = (bitPos >> 3); |
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bitRes = bitPos & 0x7; |
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instruction = 0; |
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for (j = 0; j < 6; j++) |
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instruction += (UInt64)data[i + j + bytePos] << (8 * j); |
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instNorm = instruction >> bitRes; |
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if (((instNorm >> 37) & 0xF) == 0x5 && ((instNorm >> 9) & 0x7) == 0) |
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{ |
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UInt32 src = (UInt32)((instNorm >> 13) & 0xFFFFF); |
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UInt32 dest; |
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src |= ((UInt32)(instNorm >> 36) & 1) << 20; |
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src <<= 4; |
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if (encoding) |
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dest = ip + (UInt32)i + src; |
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else |
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dest = src - (ip + (UInt32)i); |
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dest >>= 4; |
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instNorm &= ~((UInt64)(0x8FFFFF) << 13); |
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instNorm |= ((UInt64)(dest & 0xFFFFF) << 13); |
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instNorm |= ((UInt64)(dest & 0x100000) << (36 - 20)); |
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instruction &= (1 << bitRes) - 1; |
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instruction |= (instNorm << bitRes); |
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for (j = 0; j < 6; j++) |
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data[i + j + bytePos] = (Byte)(instruction >> (8 * j)); |
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} |
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} |
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} |
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return i; |
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}
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