1 /* BranchPPC.c */

     2 

     3 #include "BranchPPC.h"

     4 

     5 UInt32 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 }