/*
 * Copyright 2002-2019 Intel Corporation.
 * 
 * This software is provided to you as Sample Source Code as defined in the accompanying
 * End User License Agreement for the Intel(R) Software Development Products ("Agreement")
 * section 1.L.
 * 
 * This software and the related documents are provided as is, with no express or implied
 * warranties, other than those that are expressly stated in the License.
 */

/*! @file
  Replace an original function with a custom function defined in the tool. The
  new function can have either the same or different signature from that of its
  original function.
*/

/* ===================================================================== */
#include "pin.H"
#include <iostream>

namespace WIND
{
    #include <windows.h>
}

using std::string;
using std::endl;
using std::cout;
using std::hex;
using std::dec;
using std::flush;
typedef VOID * (*FUNCPTR_MALLOC)(size_t);


/* ===================================================================== */
VOID * Probe_Malloc_IA32( FUNCPTR_MALLOC orgFuncptr, size_t arg0,
                    ADDRINT returnIp,
                    ADDRINT esp, ADDRINT ebp )
{
    cout << "Probe_Malloc_IA32 (" << hex << (ADDRINT) orgFuncptr << ", " 
         << hex << arg0 << ", "		
         << hex << returnIp << ","
         << hex << esp << ", "
         << hex << ebp << ")" 
         << endl << flush;

    ASSERTX(esp <= 0xffffffff);

    VOID * v = orgFuncptr(arg0);
    return v;
}

/* ===================================================================== */
VOID ImageLoad(IMG img, VOID *v)
{
    const char * name = "malloc";
 
    RTN rtn = RTN_FindByName(img, name);
    if (RTN_Valid(rtn) && RTN_IsSafeForProbedReplacement(rtn))
    {
        PROTO proto_funcptr = PROTO_Allocate(PIN_PARG(WIND::LPVOID),
                                             CALLINGSTD_DEFAULT,  name,
                                             PIN_PARG(size_t),
                                             PIN_PARG_END() );

        cout << "Replacing " << name << " in " << IMG_Name(img) << endl;

        RTN_ReplaceSignatureProbed(
            rtn, AFUNPTR(Probe_Malloc_IA32),
            IARG_PROTOTYPE, proto_funcptr,
            IARG_ORIG_FUNCPTR,
            IARG_FUNCARG_ENTRYPOINT_VALUE, 0,
            IARG_RETURN_IP,
            IARG_REG_VALUE, REG_ESP,
            IARG_REG_VALUE, REG_EBP,
            IARG_END);

        PROTO_Free( proto_funcptr);
    }
}
/* ===================================================================== */
int main(INT32 argc, CHAR *argv[])
{
    PIN_InitSymbols();

    PIN_Init(argc, argv);

    IMG_AddInstrumentFunction(ImageLoad, 0);
    
    PIN_StartProgramProbed();

    return 0;
}
/* ===================================================================== */
/* eof */
/* ===================================================================== */