gen_unpacker_pintool.cpp

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/*
 *  This file contains an ISA-portable PIN tool for tracing memory accesses.
 */

#include <stdio.h>
#include <iostream>
#include <fstream>
#include <vector>
#include <map>
#include <algorithm>
#include "pin.H"

typedef std::vector<ADDRINT> addrdeq_t;
addrdeq_t write_address;

FILE * trace;

// Print a memory write record
VOID RecordMemWrite(VOID * ip, VOID * addr)
{
    write_address.push_back((ADDRINT)addr);
}

inline ADDRINT was_written(ADDRINT ea)
{
  return std::find(write_address.begin(), write_address.end(), ea) != write_address.end();
}

VOID check_unpacked_cb(VOID * ip, const CONTEXT *ctxt, THREADID tid)
{ 
  // we clear the current instruction map
  write_address.clear();
  cerr << "Layer unpacked: " << ip << endl; 
  PIN_ApplicationBreakpoint(ctxt, tid, false, "Layer unpacked!");
}

// Is called for every instruction and instruments reads and writes
VOID Instruction(INS ins, VOID *v)
{
    // Instruments memory accesses using a predicated call, i.e.
    // the instrumentation is called iff the instruction will actually be executed.
    //
    // On the IA-32 and Intel(R) 64 architectures conditional moves and REP 
    // prefixed instructions appear as predicated instructions in Pin.
    UINT32 memOperands = INS_MemoryOperandCount(ins);

    // Iterate over each memory operand of the instruction.
    for (UINT32 memOp = 0; memOp < memOperands; memOp++)
    {
        // Note that in some architectures a single memory operand can be 
        // both read and written (for instance incl (%eax) on IA-32)
        // In that case we instrument it once for read and once for write.
        if (INS_MemoryOperandIsWritten(ins, memOp))
        {
            INS_InsertPredicatedCall(
                ins, IPOINT_BEFORE, (AFUNPTR)RecordMemWrite,
                IARG_INST_PTR,
                IARG_MEMORYOP_EA, memOp,
                IARG_END);
        }

    }
}

static VOID trace_cb(TRACE trace, VOID *v)
{
  // check if trace is on written region
  for ( BBL bbl = TRACE_BblHead(trace); BBL_Valid(bbl); bbl = BBL_Next(bbl) )
  {
	  INS ins = BBL_InsHead(bbl);
	  ADDRINT ea = INS_Address(ins);
	  //cout << "Checking ea: " << hexstr(ea) << endl;
	  if(was_written(ea)) {
		INS_InsertCall(ins, IPOINT_BEFORE, (AFUNPTR)check_unpacked_cb,
            IARG_INST_PTR,
            IARG_CONST_CONTEXT,
            IARG_THREAD_ID,
            IARG_END);
	  }
  }
}

VOID Fini(INT32 code, VOID *v)
{
    fprintf(trace, "#eof\n");
    fclose(trace);
}

/* ===================================================================== */
/* Print Help Message                                                    */
/* ===================================================================== */
   
INT32 Usage()
{
    PIN_ERROR( "This Pintool stops the debugger when code written in runtime is executed\n" 
              + KNOB_BASE::StringKnobSummary() + "\n");
    return -1;
}

/* ===================================================================== */
/* Main                                                                  */
/* ===================================================================== */

int main(int argc, char *argv[])
{	
	// sometimes PIN wasn't printing to console...
	//std::ofstream outta("out.txt"); 
    //std::cout.rdbuf(outta.rdbuf());
	//std::cerr.rdbuf(outta.rdbuf());
	
	cerr << "Pintool loaded ... " << endl;


	if (PIN_Init(argc, argv)) return Usage();

	TRACE_AddInstrumentFunction(trace_cb, 0);
    INS_AddInstrumentFunction(Instruction, 0);
    PIN_AddFiniFunction(Fini, 0);

    // Never returns
    cerr << "Starting instrumentation .... " << endl;

	PIN_StartProgram();
    
    return 0;
}