96 lines
2.2 KiB
C++
96 lines
2.2 KiB
C++
#ifndef ELFSPY_GOTENTRY_H
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#define ELFSPY_GOTENTRY_H
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#include <typeinfo>
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#include <vector>
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#include "elfspy/MethodPointer.h"
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namespace spy
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{
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/**
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* @namespace spy
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* @class GOTEntry
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* Handle a function of interest and all its references in all Global Offset
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* Tables
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*/
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class GOTEntry
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{
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public:
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GOTEntry() = default;
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/**
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* @param function address of function
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* @param name name of function
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* @return original unaltered address of function
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*/
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void* set(void* function, const char* name);
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/**
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* replace function with other function and reference count
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* @param function to enter in Global Offset Tables instead of original
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* @return original entry in Global Offset Table instead of original
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*/
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void* spy_with(void* function);
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/**
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* count down reference count from spy_with and restore original entry in
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* Global Offset Tables if count is zero
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*/
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void restore();
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/**
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* replace function with other function
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* @param function to enter in Global Offset Tables instead of original
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* @return original entry in Global Offset Table instead of original
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*/
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void* patch(void* function);
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/**
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* get the address of a virtual function
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* @param type type info of class
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* @param method method function pointer
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* @return address of address of virtual function for that class
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*/
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static void** get_vtable_entry(const std::type_info& type,
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const MethodPointer& method);
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static void initialise(int argc, char** argv);
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const void* current() const;
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const void* original() const;
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/**
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* add an entry to the function pointer addresses
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* @param address address of address of function
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*/
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void make_entry(void** address);
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private:
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struct Entry
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{
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void** address_;
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void* restore_;
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};
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std::vector<Entry> entries_; // all entries
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size_t spy_count_ = 0;
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void* current_ = nullptr;
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void* original_ = nullptr;
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void make_entry(unsigned char* address);
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};
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inline const void* GOTEntry::current() const
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{
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return original_;
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}
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inline const void* GOTEntry::original() const
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{
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return original_;
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}
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inline void GOTEntry::make_entry(unsigned char* address)
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{
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make_entry(reinterpret_cast<void**>(address));
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}
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} // namespace spy
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#endif
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