1/* BranchPPC.c */
2
3#include "BranchPPC.h"
4
5UInt32 PPC_B_Convert(Byte *data, UInt32 size, UInt32 nowPos, int encoding)
6{
7  UInt32 i;
8  for (i = 0; i + 4 <= size; i += 4)
9  {
10    /* PowerPC branch 6(48) 24(Offset) 1(Abs) 1(Link) */
11    if ((data[i] >> 2) == 0x12 &&
12    (
13      (data[i + 3] & 3) == 1
14      /* || (data[i+3] & 3) == 3 */
15      )
16    )
17    {
18      UInt32 src = ((data[i + 0] & 3) << 24) |
19        (data[i + 1] << 16) |
20        (data[i + 2] << 8) |
21        (data[i + 3] & (~3));
22
23      UInt32 dest;
24      if (encoding)
25        dest = nowPos + i + src;
26      else
27        dest = src - (nowPos + i);
28      data[i + 0] = (Byte)(0x48 | ((dest >> 24) &  0x3));
29      data[i + 1] = (Byte)(dest >> 16);
30      data[i + 2] = (Byte)(dest >> 8);
31      data[i + 3] &= 0x3;
32      data[i + 3] |= dest;
33    }
34  }
35  return i;
36}
37