/// <summary>
/// Builds a list of addresses that will be used as a jump or call vector.
/// </summary>
/// <param name="addrTable">The address at which the table starts.</param>
/// <param name="limit">The number of bytes that comprise the table</param>
/// <param name="permutation">If not null, a permutation of the items in the table</param>
/// <param name="stride">The size of the individual addresses in the table.</param>
/// <param name="state">Current processor state.</param>
/// <returns></returns>
private List <Address> BuildTable(Address addrTable, int limit, int[] permutation, int stride, ProcessorState state)
{
List <Address> vector = new List <Address>();
if (permutation != null)
{
int cbEntry = stride;
int iMax = 0;
for (int i = 0; i < permutation.Length; ++i)
{
if (permutation[i] > iMax)
{
iMax = permutation[i];
}
var entryAddr = (uint)(addrTable - program.Image.BaseAddress) + (uint)(permutation[i] * cbEntry);
var addr = Address.Ptr32(program.Image.ReadLeUInt32(entryAddr)); //$BUG: will fail on 64-bit arch.
vector.Add(addr);
}
}
else
{
ImageReader rdr = scanner.CreateReader(addrTable);
int cItems = limit / (int)stride;
var image = program.Image;
var arch = program.Architecture;
for (int i = 0; i < cItems; ++i)
{
var entryAddr = program.Architecture.ReadCodeAddress(stride, rdr, state);
if (!image.IsValidAddress(entryAddr))
{
scanner.Warn(addrTable, "The call or jump table has invalid addresses; stopping.");
break;
}
vector.Add(entryAddr);
}
cbTable = limit;
}
return(vector);
}
/// <summary>
/// Builds a list of addresses that will be used as a jump or call vector.
/// </summary>
/// <param name="addrTable">The address at which the table starts.</param>
/// <param name="limit">The number of bytes that comprise the table</param>
/// <param name="permutation">If not null, a permutation of the items in the table</param>
/// <param name="stride">The size of the individual addresses in the table.</param>
/// <param name="state">Current processor state.</param>
/// <returns>The target addresses reached by the vector</returns>
public List <Address> BuildTable(Address addrTable, int limit, int[] permutation, int stride, ProcessorState state)
{
List <Address> vector = new List <Address>();
if (permutation != null)
{
int cbEntry = stride;
int iMax = 0;
for (int i = 0; i < permutation.Length; ++i)
{
if (permutation[i] > iMax)
{
iMax = permutation[i];
}
var entryAddr = addrTable + (uint)(permutation[i] * cbEntry);
var addr = program.Architecture.ReadCodeAddress(0, program.CreateImageReader(entryAddr), state);
vector.Add(addr);
}
}
else
{
ImageReader rdr = scanner.CreateReader(addrTable);
int cItems = limit / stride;
var imageMap = program.ImageMap;
var arch = program.Architecture;
for (int i = 0; i < cItems; ++i)
{
var entryAddr = program.Architecture.ReadCodeAddress(stride, rdr, state);
if (!imageMap.IsValidAddress(entryAddr))
{
scanner.Warn(addrTable, "The call or jump table has invalid addresses; stopping.");
break;
}
vector.Add(entryAddr);
}
TableByteSize = limit;
}
return(vector);
}
