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//  Replace an original function with a custom function defined in the tool using
//  probes.  The replacement function has a different signature from that of the 
//  original replaced function.

#include "pin.H"
#include <iostream>
using namespace std;

typedef VOID * ( *FP_MALLOC )( size_t );

// This is the replacement routine.
//
VOID * NewMalloc( FP_MALLOC orgFuncptr, UINT32 arg0, ADDRINT returnIp )
{
    // Normally one would do something more interesting with this data.
    //
    cout << "NewMalloc ("
         << hex << ADDRINT ( orgFuncptr ) << ", " 
         << dec << arg0 << ", " 
         << hex << returnIp << ")"
         << endl << flush;

    // Call the relocated entry point of the original (replaced) routine.
    //
    VOID * v = orgFuncptr( arg0 );

    return v;
}


// Pin calls this function every time a new img is loaded.
// It is best to do probe replacement when the image is loaded,
// because only one thread knows about the image at this time.
//
VOID ImageLoad( IMG img, VOID *v )
{
    // See if malloc() is present in the image.  If so, replace it.
    //
    RTN rtn = RTN_FindByName( img, "malloc" );
    
    if (RTN_Valid(rtn))
    {
        cout << "Replacing malloc in " << IMG_Name(img) << endl;
        
        // Define a function prototype that describes the application routine
        // that will be replaced.
        //
        PROTO proto_malloc = PROTO_Allocate( PIN_PARG(void *), CALLINGSTD_DEFAULT,
                                             "malloc", PIN_PARG(int), PIN_PARG_END() );
        
        // Replace the application routine with the replacement function.
        // Additional arguments have been added to the replacement routine.
        // The return value and the argument passed into the replacement
        // function with IARG_ORIG_FUNCPTR are the same.
        //
        AFUNPTR origptr = RTN_ReplaceSignatureProbed(rtn, AFUNPTR(NewMalloc),
                                                     IARG_PROTOTYPE, proto_malloc,
                                                     IARG_ORIG_FUNCPTR,
                                                     IARG_FUNCARG_ENTRYPOINT_VALUE, 0,
                                                     IARG_RETURN_IP,
                                                     IARG_END);

        cout << "The original entry point to the replaced function has been moved to 0x";
        cout << hex << ( ADDRINT ) origptr << dec << endl;
        
        // Free the function prototype.
        //
        PROTO_Free( proto_malloc );
    }
}


// Initialize and start Pin in Probe mode.  "-probe" must be used on
// the command line.
//
int main( INT32 argc, CHAR *argv[] )
{
    // Initialize symbol processing
    //
    PIN_InitSymbols();
    
    // Initialize pin
    //
    PIN_Init( argc, argv );
    
    // Register ImageLoad to be called when an image is loaded
    //
    IMG_AddInstrumentFunction( ImageLoad, 0 );
    
    // Start the program in probe mode, never returns
    //
    PIN_StartProgramProbed();
    
    return 0;
}