ce188d4d |
1 | /* BraIA64.c -- Converter for IA-64 code\r |
2 | 2013-11-12 : Igor Pavlov : Public domain */\r |
3 | \r |
4 | #include "Precomp.h"\r |
5 | \r |
6 | #include "Bra.h"\r |
7 | \r |
8 | static const Byte kBranchTable[32] =\r |
9 | {\r |
10 | 0, 0, 0, 0, 0, 0, 0, 0,\r |
11 | 0, 0, 0, 0, 0, 0, 0, 0,\r |
12 | 4, 4, 6, 6, 0, 0, 7, 7,\r |
13 | 4, 4, 0, 0, 4, 4, 0, 0\r |
14 | };\r |
15 | \r |
16 | SizeT IA64_Convert(Byte *data, SizeT size, UInt32 ip, int encoding)\r |
17 | {\r |
18 | SizeT i;\r |
19 | if (size < 16)\r |
20 | return 0;\r |
21 | size -= 16;\r |
22 | for (i = 0; i <= size; i += 16)\r |
23 | {\r |
24 | UInt32 instrTemplate = data[i] & 0x1F;\r |
25 | UInt32 mask = kBranchTable[instrTemplate];\r |
26 | UInt32 bitPos = 5;\r |
27 | int slot;\r |
28 | for (slot = 0; slot < 3; slot++, bitPos += 41)\r |
29 | {\r |
30 | UInt32 bytePos, bitRes;\r |
31 | UInt64 instruction, instNorm;\r |
32 | int j;\r |
33 | if (((mask >> slot) & 1) == 0)\r |
34 | continue;\r |
35 | bytePos = (bitPos >> 3);\r |
36 | bitRes = bitPos & 0x7;\r |
37 | instruction = 0;\r |
38 | for (j = 0; j < 6; j++)\r |
39 | instruction += (UInt64)data[i + j + bytePos] << (8 * j);\r |
40 | \r |
41 | instNorm = instruction >> bitRes;\r |
42 | if (((instNorm >> 37) & 0xF) == 0x5 && ((instNorm >> 9) & 0x7) == 0)\r |
43 | {\r |
44 | UInt32 src = (UInt32)((instNorm >> 13) & 0xFFFFF);\r |
45 | UInt32 dest;\r |
46 | src |= ((UInt32)(instNorm >> 36) & 1) << 20;\r |
47 | \r |
48 | src <<= 4;\r |
49 | \r |
50 | if (encoding)\r |
51 | dest = ip + (UInt32)i + src;\r |
52 | else\r |
53 | dest = src - (ip + (UInt32)i);\r |
54 | \r |
55 | dest >>= 4;\r |
56 | \r |
57 | instNorm &= ~((UInt64)(0x8FFFFF) << 13);\r |
58 | instNorm |= ((UInt64)(dest & 0xFFFFF) << 13);\r |
59 | instNorm |= ((UInt64)(dest & 0x100000) << (36 - 20));\r |
60 | \r |
61 | instruction &= (1 << bitRes) - 1;\r |
62 | instruction |= (instNorm << bitRes);\r |
63 | for (j = 0; j < 6; j++)\r |
64 | data[i + j + bytePos] = (Byte)(instruction >> (8 * j));\r |
65 | }\r |
66 | }\r |
67 | }\r |
68 | return i;\r |
69 | }\r |