mirror of
https://github.com/ZDoom/gzdoom.git
synced 2024-11-14 00:20:51 +00:00
69 lines
1.7 KiB
C
69 lines
1.7 KiB
C
/* BraIA64.c -- Converter for IA-64 code
|
|
2013-11-12 : Igor Pavlov : Public domain */
|
|
|
|
#include "Precomp.h"
|
|
|
|
#include "Bra.h"
|
|
|
|
static const Byte kBranchTable[32] =
|
|
{
|
|
0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0,
|
|
4, 4, 6, 6, 0, 0, 7, 7,
|
|
4, 4, 0, 0, 4, 4, 0, 0
|
|
};
|
|
|
|
SizeT IA64_Convert(Byte *data, SizeT size, UInt32 ip, int encoding)
|
|
{
|
|
SizeT i;
|
|
if (size < 16)
|
|
return 0;
|
|
size -= 16;
|
|
for (i = 0; i <= size; i += 16)
|
|
{
|
|
UInt32 instrTemplate = data[i] & 0x1F;
|
|
UInt32 mask = kBranchTable[instrTemplate];
|
|
UInt32 bitPos = 5;
|
|
int slot;
|
|
for (slot = 0; slot < 3; slot++, bitPos += 41)
|
|
{
|
|
UInt32 bytePos, bitRes;
|
|
UInt64 instruction, instNorm;
|
|
int j;
|
|
if (((mask >> slot) & 1) == 0)
|
|
continue;
|
|
bytePos = (bitPos >> 3);
|
|
bitRes = bitPos & 0x7;
|
|
instruction = 0;
|
|
for (j = 0; j < 6; j++)
|
|
instruction += (UInt64)data[i + j + bytePos] << (8 * j);
|
|
|
|
instNorm = instruction >> bitRes;
|
|
if (((instNorm >> 37) & 0xF) == 0x5 && ((instNorm >> 9) & 0x7) == 0)
|
|
{
|
|
UInt32 src = (UInt32)((instNorm >> 13) & 0xFFFFF);
|
|
UInt32 dest;
|
|
src |= ((UInt32)(instNorm >> 36) & 1) << 20;
|
|
|
|
src <<= 4;
|
|
|
|
if (encoding)
|
|
dest = ip + (UInt32)i + src;
|
|
else
|
|
dest = src - (ip + (UInt32)i);
|
|
|
|
dest >>= 4;
|
|
|
|
instNorm &= ~((UInt64)(0x8FFFFF) << 13);
|
|
instNorm |= ((UInt64)(dest & 0xFFFFF) << 13);
|
|
instNorm |= ((UInt64)(dest & 0x100000) << (36 - 20));
|
|
|
|
instruction &= (1 << bitRes) - 1;
|
|
instruction |= (instNorm << bitRes);
|
|
for (j = 0; j < 6; j++)
|
|
data[i + j + bytePos] = (Byte)(instruction >> (8 * j));
|
|
}
|
|
}
|
|
}
|
|
return i;
|
|
}
|