BranchPPC.c
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/* BranchPPC.c */
#include "BranchPPC.h"
UInt32 PPC_B_Convert(Byte *data, UInt32 size, UInt32 nowPos, int encoding)
{
UInt32 i;
for (i = 0; i + 4 <= size; i += 4)
{
/* PowerPC branch 6(48) 24(Offset) 1(Abs) 1(Link) */
if ((data[i] >> 2) == 0x12 &&
(
(data[i + 3] & 3) == 1
/* || (data[i+3] & 3) == 3 */
)
)
{
UInt32 src = ((data[i + 0] & 3) << 24) |
(data[i + 1] << 16) |
(data[i + 2] << 8) |
(data[i + 3] & (~3));
UInt32 dest;
if (encoding)
dest = nowPos + i + src;
else
dest = src - (nowPos + i);
data[i + 0] = (Byte)(0x48 | ((dest >> 24) & 0x3));
data[i + 1] = (Byte)(dest >> 16);
data[i + 2] = (Byte)(dest >> 8);
data[i + 3] &= 0x3;
data[i + 3] |= dest;
}
}
return i;
}