1 /* BraIA64.c -- Converter for IA-64 code
2 2008-10-04 : Igor Pavlov : Public domain */
3
4 #include "Bra.h"
5
6 static const Byte kBranchTable[32] =
7 {
8 0, 0, 0, 0, 0, 0, 0, 0,
9 0, 0, 0, 0, 0, 0, 0, 0,
10 4, 4, 6, 6, 0, 0, 7, 7,
11 4, 4, 0, 0, 4, 4, 0, 0
12 };
13
IA64_Convert(Byte * data,SizeT size,UInt32 ip,int encoding)14 SizeT IA64_Convert(Byte *data, SizeT size, UInt32 ip, int encoding)
15 {
16 SizeT i;
17 if (size < 16)
18 return 0;
19 size -= 16;
20 for (i = 0; i <= size; i += 16)
21 {
22 UInt32 instrTemplate = data[i] & 0x1F;
23 UInt32 mask = kBranchTable[instrTemplate];
24 UInt32 bitPos = 5;
25 int slot;
26 for (slot = 0; slot < 3; slot++, bitPos += 41)
27 {
28 UInt32 bytePos, bitRes;
29 UInt64 instruction, instNorm;
30 int j;
31 if (((mask >> slot) & 1) == 0)
32 continue;
33 bytePos = (bitPos >> 3);
34 bitRes = bitPos & 0x7;
35 instruction = 0;
36 for (j = 0; j < 6; j++)
37 instruction += (UInt64)data[i + j + bytePos] << (8 * j);
38
39 instNorm = instruction >> bitRes;
40 if (((instNorm >> 37) & 0xF) == 0x5 && ((instNorm >> 9) & 0x7) == 0)
41 {
42 UInt32 src = (UInt32)((instNorm >> 13) & 0xFFFFF);
43 UInt32 dest;
44 src |= ((UInt32)(instNorm >> 36) & 1) << 20;
45
46 src <<= 4;
47
48 if (encoding)
49 dest = ip + (UInt32)i + src;
50 else
51 dest = src - (ip + (UInt32)i);
52
53 dest >>= 4;
54
55 instNorm &= ~((UInt64)(0x8FFFFF) << 13);
56 instNorm |= ((UInt64)(dest & 0xFFFFF) << 13);
57 instNorm |= ((UInt64)(dest & 0x100000) << (36 - 20));
58
59 instruction &= (1 << bitRes) - 1;
60 instruction |= (instNorm << bitRes);
61 for (j = 0; j < 6; j++)
62 data[i + j + bytePos] = (Byte)(instruction >> (8 * j));
63 }
64 }
65 }
66 return i;
67 }
68