BraIA64.c
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BraIA64.c
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	/* BraIA64.c -- Converter for IA-64 code
	2008-10-04 : Igor Pavlov : Public domain */

	#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;
	}