/* Bra.c -- Converters for RISC code

 2010-04-16 : Igor Pavlov : Public domain */

 
 #include "Bra.h"
 
 SizeT ARM_Convert(Byte *data, SizeT size, UInt32 ip, int encoding)
 {
   SizeT i;
   if (size < 4)
     return 0;
   size -= 4;
   ip += 8;
   for (i = 0; i <= size; i += 4)
   {
     if (data[i + 3] == 0xEB)
     {
       UInt32 dest;
       UInt32 src = ((UInt32)data[i + 2] << 16) | ((UInt32)data[i + 1] << 8) | (data[i + 0]);
       src <<= 2;
       if (encoding)
         dest = ip + (UInt32)i + src;
       else
         dest = src - (ip + (UInt32)i);
       dest >>= 2;
       data[i + 2] = (Byte)(dest >> 16);
       data[i + 1] = (Byte)(dest >> 8);
       data[i + 0] = (Byte)dest;
     }
   }
   return i;
 }
 
 SizeT ARMT_Convert(Byte *data, SizeT size, UInt32 ip, int encoding)
 {
   SizeT i;
   if (size < 4)
     return 0;
   size -= 4;
   ip += 4;
   for (i = 0; i <= size; i += 2)
   {
     if ((data[i + 1] & 0xF8) == 0xF0 &&
         (data[i + 3] & 0xF8) == 0xF8)
     {
       UInt32 dest;
       UInt32 src =
         (((UInt32)data[i + 1] & 0x7) << 19) |
         ((UInt32)data[i + 0] << 11) |
         (((UInt32)data[i + 3] & 0x7) << 8) |
         (data[i + 2]);
       
       src <<= 1;
       if (encoding)
         dest = ip + (UInt32)i + src;
       else
         dest = src - (ip + (UInt32)i);
       dest >>= 1;
       
       data[i + 1] = (Byte)(0xF0 | ((dest >> 19) & 0x7));
       data[i + 0] = (Byte)(dest >> 11);
       data[i + 3] = (Byte)(0xF8 | ((dest >> 8) & 0x7));
       data[i + 2] = (Byte)dest;
       i += 2;
     }
   }
   return i;
 }
 
 SizeT PPC_Convert(Byte *data, SizeT size, UInt32 ip, int encoding)
 {
   SizeT i;
   if (size < 4)
     return 0;
   size -= 4;
   for (i = 0; i <= size; i += 4)
   {
     if ((data[i] >> 2) == 0x12 && (data[i + 3] & 3) == 1)
     {
       UInt32 src = ((UInt32)(data[i + 0] & 3) << 24) |
         ((UInt32)data[i + 1] << 16) |
         ((UInt32)data[i + 2] << 8) |
         ((UInt32)data[i + 3] & (~3));
       
       UInt32 dest;
       if (encoding)
         dest = ip + (UInt32)i + src;
       else
         dest = src - (ip + (UInt32)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;
 }
 
 SizeT SPARC_Convert(Byte *data, SizeT size, UInt32 ip, int encoding)
 {
   UInt32 i;
   if (size < 4)
     return 0;
   size -= 4;
   for (i = 0; i <= size; i += 4)
   {

     if ((data[i] == 0x40 && (data[i + 1] & 0xC0) == 0x00) ||
         (data[i] == 0x7F && (data[i + 1] & 0xC0) == 0xC0))

     {
       UInt32 src =
         ((UInt32)data[i + 0] << 24) |
         ((UInt32)data[i + 1] << 16) |
         ((UInt32)data[i + 2] << 8) |
         ((UInt32)data[i + 3]);
       UInt32 dest;
       
       src <<= 2;
       if (encoding)
         dest = ip + i + src;
       else
         dest = src - (ip + i);
       dest >>= 2;
       
       dest = (((0 - ((dest >> 22) & 1)) << 22) & 0x3FFFFFFF) | (dest & 0x3FFFFF) | 0x40000000;
 
       data[i + 0] = (Byte)(dest >> 24);
       data[i + 1] = (Byte)(dest >> 16);
       data[i + 2] = (Byte)(dest >> 8);
       data[i + 3] = (Byte)dest;
     }
   }
   return i;
 }