Question

我有以下C代码：

#include <stdio.h>

int foo()
{
  int a = 4;
  int *p = &a;
  printf("%i\n", *p);
  int b[10];
  b[1] = 3;
}

int main(void)
{
  int a[10], b[20];
  a[2] = 7;
  b[7] = 9;
  foo();
  return 0;
}

我创建了以下PIN工具：

#include <fstream>
#include <iostream>
#include "pin.H"

// Additional library calls go here

/*********************/

// Output file object
ofstream OutFile;

//static uint64_t counter = 0;

uint32_t lock = 0;
uint32_t unlock = 1;
std::string rtin = "";
// Make this lock if you want to print from _start
uint32_t key = unlock;

void printmaindisas(uint64_t addr, std::string disassins)
{
    std::stringstream tempstream;
    tempstream << std::hex << addr;
    std::string address = tempstream.str();
    if (key)
        return;
    if (addr > 0x700000000000)
        return;
    std::cout<<address<<"\t"<<disassins<<std::endl;
}

void mutex_lock()
{

key = !lock;
std::cout<<"out\n";

}
void mutex_unlock()
{

    key = lock;
    std::cout<<"in\n";

}

void Instruction(INS ins, VOID *v)
{

    // if (INS_IsStackWrite(ins) == true)
    // {
    //  std::cout << "Stack write instruction: " << INS_Disassemble(ins) << '\n';
    // }
  // Insert a call to docount before every instruction, no arguments are passed
  INS_InsertCall(ins, IPOINT_BEFORE, (AFUNPTR)printmaindisas, IARG_ADDRINT, INS_Address(ins),
  IARG_PTR, new string(INS_Disassemble(ins)), IARG_END);
    //std::cout<<INS_Disassemble(ins)<<std::endl;
}

void Routine(RTN rtn, VOID *V)
{
    if (RTN_Name(rtn) == "main")
    {
        //std::cout<<"Loading: "<<RTN_Name(rtn) << endl;
        RTN_Open(rtn);
        RTN_InsertCall(rtn, IPOINT_BEFORE, (AFUNPTR)mutex_unlock, IARG_END);
        RTN_InsertCall(rtn, IPOINT_AFTER, (AFUNPTR)mutex_lock, IARG_END);
        RTN_Close(rtn);
    }
}

KNOB<string> KnobOutputFile(KNOB_MODE_WRITEONCE, "pintool", "o", "mytool.out", "specify output file name");
/*
VOID Fini(INT32 code, VOID *v)
{
    // Write to a file since cout and cerr maybe closed by the application
    OutFile.setf(ios::showbase);
    OutFile << "Count " << count << endl;
    OutFile.close();
}
*/

int32_t Usage()
{
  cerr << "This is my custom tool" << endl;
  cerr << endl << KNOB_BASE::StringKnobSummary() << endl;
  return -1;
}

int main(int argc, char * argv[])
{
  // It must be called for image instrumentation
  // Initialize the symbol table
  PIN_InitSymbols();
  // Initialize pin
    // PIN_Init must be called before PIN_StartProgram
    // as mentioned in the documentation
  if (PIN_Init(argc, argv)) return Usage();

  // Open the output file to write
  OutFile.open(KnobOutputFile.Value().c_str());

  // Set instruction format as intel
    // Not needed because my machine is intel
  PIN_SetSyntaxIntel();

  RTN_AddInstrumentFunction(Routine, 0);
  //IMG_AddInstrumentFunction(Image, 0);

  // Add an isntruction instrumentation
  INS_AddInstrumentFunction(Instruction, 0);

  //PIN_AddFiniFunction(Fini, 0);

  // Start the program here
  PIN_StartProgram();

  return 0;

}

它给了我以下输出：

in
40051e  push rbp
40051f  mov rbp, rsp
400522  add rsp, 0xffffffffffffff80
400526  mov dword ptr [rbp-0x28], 0x7
40052d  mov dword ptr [rbp-0x64], 0x9
400534  mov eax, 0x0
400539  call 0x4004e6
4004e6  push rbp
4004e7  mov rbp, rsp
4004ea  sub rsp, 0x40
4004ee  mov dword ptr [rbp-0xc], 0x4
4004f5  lea rax, ptr [rbp-0xc]
4004f9  mov qword ptr [rbp-0x8], rax
4004fd  mov rax, qword ptr [rbp-0x8]
400501  mov eax, dword ptr [rax]
400503  mov esi, eax
400505  mov edi, 0x4005d0
40050a  mov eax, 0x0
40050f  call 0x4003f0
4003f0  jmp qword ptr [rip+0x200c22]
4003f6  push 0x0
4003fb  jmp 0x4003e0
4003e0  push qword ptr [rip+0x200c22]
4003e6  jmp qword ptr [rip+0x200c24]
4
400514  mov dword ptr [rbp-0x3c], 0x3
40051b  nop
40051c  leave 
40051d  ret 
40053e  mov eax, 0x0
400543  leave 
out

对于 main 函数，我想获取值0xffffffffffffff80；对于函数 foo ，我想获取0x40值。简而言之，我想在函数创建后获取已分配的堆栈位置。因此，一种实现方法是通过检测特定指令，在这种情况下，例如说add / sub rsp，然后修整输出以获得特定字符串。另一种方法是获取rbp或rsp的值（如果我在这里错了，请纠正我）。

我查看了pin api文档here，还看到了here给出的一些示例，但是仍然找不到获取特定字符串值的方法。

在我尝试过的文档之后：

if (INS_RegR(ins, 0) == REG_RSP)
        std::cout << "rsp: " << REG_Size(REG_RSP) << '\n';

但是，仍然不知道如何获取值。

你能帮我吗？

Answer 1

来自if (INS_OperandIsImmediate(ins, i)) { // Get the value itself ADDRINT value = INS_OperandImmediate(ins, i); // Determine the size and the signedness of the immediate value. }的示例pintool显示了如何获取立即操作数。看起来像这样：

在您的情况下，RSP为1，因为您需要检查第二个操作数是否为立即数。您还需要检查第一个操作数是否是显式ADD寄存器，并且指令是SUB还是if((INS_Opcode(ins) == XED_ICLASS_ADD || INS_Opcode(ins) == XED_ICLASS_SUB) && REG(INS_OperandReg(ins, 0)) == REG_STACK_PTR && INS_OperandIsImmediate(ins, 1)) { // Obtain the immediate operand information as shown above. // You can obtain the RSP register value before or after the instruction by // passing IARG_REG_VALUE, REG_STACK_PTR to INS_Insert*. }。本质上，您需要找到第一个这样的指令。

alloca

某些编程语言或特定的实现可能允许在动态大小的堆栈上分配变量。例如，大多数C / C ++实现都提供stackalloc，它通常从堆栈中分配内存。作为另一个示例，C＃语言提供了ADD关键字。因此，第二个操作数不一定总是立即数，并且可以有多个SUB / Builder builder = CustomAnalyzer.builder(); builder.withTokenizer(StandardTokenizerFactory.class); MySynonymGraphFilterFactory.registerSynonyms(Arrays.asList( Arrays.asList("go to", "navigate", "open") )); builder.addTokenFilter(MySynonymGraphFilterFactory.class, "synonyms", "unused");指令将吞吐量分配给从堆栈分配/释放内存的函数。

使用Intel Pin工具的堆栈分配大小

1 个答案: