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358 lines
14 KiB
358 lines
14 KiB
#pragma once
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#include <compiler.hpp>
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#include <fstream>
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#include <vmprofiler.hpp>
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#include <xtils.hpp>
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namespace gen {
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/// <summary>
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/// function pasted from
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/// https://stackoverflow.com/questions/2342162/stdstring-formatting-like-sprintf
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/// </summary>
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/// <typeparam name="...Args"></typeparam>
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/// <param name="format"></param>
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/// <param name="...args"></param>
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/// <returns></returns>
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template <typename... Args>
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std::string string_format(const std::string& format, Args... args) {
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int size_s = std::snprintf(nullptr, 0, format.c_str(), args...) + 1;
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auto size = static_cast<size_t>(size_s);
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auto buf = std::make_unique<char[]>(size);
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std::snprintf(buf.get(), size, format.c_str(), args...);
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return std::string(buf.get(), buf.get() + size - 1);
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}
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/// <summary>
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/// generates c++ header file which MUST BE COMPILED USING CLANG BECAUSE MSVC
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/// CANT HANDLE HUGE STATIC INITS (6/13/2021)....
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/// </summary>
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/// <param name="labels">vector of compiled labels...</param>
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/// <param name="image_path">path to the image on disk...</param>
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/// <param name="vmctx"></param>
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/// <returns></returns>
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inline std::string code(std::vector<vm::compiled_label_data>& labels,
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std::string image_path,
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vm::ctx_t& vmctx) {
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std::string result, raw_file_array;
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std::vector<std::uint8_t> raw_file;
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xtils::um_t::get_instance()->open_binary_file(image_path, raw_file);
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for (auto idx = 0u; idx < raw_file.size(); ++idx)
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raw_file_array.append(string_format("0x%x, ", raw_file[idx]));
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result.append(
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"#pragma once\n"
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"#pragma section( \".xmp2\" )\n"
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"#pragma comment( linker, \"/section:.xmp2,RWE\" ) \n\n");
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result.append(
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"namespace vm\n"
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"{\n");
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result.append(R"( using u8 = unsigned char;
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using s8 = signed char;
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using u16 = unsigned short;
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using s16 = signed short;
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using u32 = unsigned int;
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using s32 = signed int;
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using u64 = unsigned long long;
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using s64 = signed long long;
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using __vmcall_t = void* (*)(...);
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constexpr u8 IMAGE_DIRECTORY_ENTRY_BASERELOC = 5;
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constexpr u8 IMAGE_REL_BASED_ABSOLUTE = 0;
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constexpr u8 IMAGE_REL_BASED_DIR64 = 10;
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typedef struct _IMAGE_DOS_HEADER
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{
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/* 0x0000 */ unsigned short e_magic;
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/* 0x0002 */ unsigned short e_cblp;
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/* 0x0004 */ unsigned short e_cp;
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/* 0x0006 */ unsigned short e_crlc;
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/* 0x0008 */ unsigned short e_cparhdr;
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/* 0x000a */ unsigned short e_minalloc;
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/* 0x000c */ unsigned short e_maxalloc;
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/* 0x000e */ unsigned short e_ss;
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/* 0x0010 */ unsigned short e_sp;
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/* 0x0012 */ unsigned short e_csum;
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/* 0x0014 */ unsigned short e_ip;
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/* 0x0016 */ unsigned short e_cs;
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/* 0x0018 */ unsigned short e_lfarlc;
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/* 0x001a */ unsigned short e_ovno;
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/* 0x001c */ unsigned short e_res[ 4 ];
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/* 0x0024 */ unsigned short e_oemid;
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/* 0x0026 */ unsigned short e_oeminfo;
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/* 0x0028 */ unsigned short e_res2[ 10 ];
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/* 0x003c */ long e_lfanew;
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} IMAGE_DOS_HEADER, *PIMAGE_DOS_HEADER; /* size: 0x0040 */
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typedef struct _IMAGE_FILE_HEADER
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{
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/* 0x0000 */ unsigned short Machine;
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/* 0x0002 */ unsigned short NumberOfSections;
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/* 0x0004 */ unsigned long TimeDateStamp;
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/* 0x0008 */ unsigned long PointerToSymbolTable;
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/* 0x000c */ unsigned long NumberOfSymbols;
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/* 0x0010 */ unsigned short SizeOfOptionalHeader;
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/* 0x0012 */ unsigned short Characteristics;
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} IMAGE_FILE_HEADER, *PIMAGE_FILE_HEADER; /* size: 0x0014 */
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typedef struct _IMAGE_DATA_DIRECTORY
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{
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/* 0x0000 */ unsigned long VirtualAddress;
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/* 0x0004 */ unsigned long Size;
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} IMAGE_DATA_DIRECTORY, *PIMAGE_DATA_DIRECTORY; /* size: 0x0008 */
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typedef struct _IMAGE_OPTIONAL_HEADER64
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{
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/* 0x0000 */ unsigned short Magic;
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/* 0x0002 */ unsigned char MajorLinkerVersion;
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/* 0x0003 */ unsigned char MinorLinkerVersion;
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/* 0x0004 */ unsigned long SizeOfCode;
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/* 0x0008 */ unsigned long SizeOfInitializedData;
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/* 0x000c */ unsigned long SizeOfUninitializedData;
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/* 0x0010 */ unsigned long AddressOfEntryPoint;
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/* 0x0014 */ unsigned long BaseOfCode;
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/* 0x0018 */ unsigned __int64 ImageBase;
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/* 0x0020 */ unsigned long SectionAlignment;
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/* 0x0024 */ unsigned long FileAlignment;
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/* 0x0028 */ unsigned short MajorOperatingSystemVersion;
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/* 0x002a */ unsigned short MinorOperatingSystemVersion;
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/* 0x002c */ unsigned short MajorImageVersion;
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/* 0x002e */ unsigned short MinorImageVersion;
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/* 0x0030 */ unsigned short MajorSubsystemVersion;
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/* 0x0032 */ unsigned short MinorSubsystemVersion;
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/* 0x0034 */ unsigned long Win32VersionValue;
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/* 0x0038 */ unsigned long SizeOfImage;
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/* 0x003c */ unsigned long SizeOfHeaders;
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/* 0x0040 */ unsigned long CheckSum;
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/* 0x0044 */ unsigned short Subsystem;
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/* 0x0046 */ unsigned short DllCharacteristics;
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/* 0x0048 */ unsigned __int64 SizeOfStackReserve;
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/* 0x0050 */ unsigned __int64 SizeOfStackCommit;
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/* 0x0058 */ unsigned __int64 SizeOfHeapReserve;
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/* 0x0060 */ unsigned __int64 SizeOfHeapCommit;
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/* 0x0068 */ unsigned long LoaderFlags;
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/* 0x006c */ unsigned long NumberOfRvaAndSizes;
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/* 0x0070 */ struct _IMAGE_DATA_DIRECTORY DataDirectory[ 16 ];
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} IMAGE_OPTIONAL_HEADER64, *PIMAGE_OPTIONAL_HEADER64; /* size: 0x00f0 */
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typedef struct _IMAGE_NT_HEADERS64
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{
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/* 0x0000 */ unsigned long Signature;
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/* 0x0004 */ struct _IMAGE_FILE_HEADER FileHeader;
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/* 0x0018 */ struct _IMAGE_OPTIONAL_HEADER64 OptionalHeader;
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} IMAGE_NT_HEADERS64, *PIMAGE_NT_HEADERS64; /* size: 0x0108 */
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typedef struct _IMAGE_SECTION_HEADER
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{
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/* 0x0000 */ unsigned char Name[ 8 ];
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union
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{
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union
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{
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/* 0x0008 */ unsigned long PhysicalAddress;
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/* 0x0008 */ unsigned long VirtualSize;
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}; /* size: 0x0004 */
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} /* size: 0x0004 */ Misc;
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/* 0x000c */ unsigned long VirtualAddress;
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/* 0x0010 */ unsigned long SizeOfRawData;
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/* 0x0014 */ unsigned long PointerToRawData;
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/* 0x0018 */ unsigned long PointerToRelocations;
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/* 0x001c */ unsigned long PointerToLinenumbers;
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/* 0x0020 */ unsigned short NumberOfRelocations;
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/* 0x0022 */ unsigned short NumberOfLinenumbers;
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/* 0x0024 */ unsigned long Characteristics;
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} IMAGE_SECTION_HEADER, *PIMAGE_SECTION_HEADER; /* size: 0x0028 */
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typedef struct _IMAGE_BASE_RELOCATION
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{
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unsigned int VirtualAddress;
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unsigned int SizeOfBlock;
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} IMAGE_BASE_RELOCATION, *PIMAGE_BASE_RELOCATION;)");
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result.append(
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"\n\n\ttemplate < class T, class U > struct _pair_t\n"
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"\t{\n"
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"\t\tT first;\n"
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"\t\tU second;\n"
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"\t};\n\n");
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result.append(string_format("\tconstexpr auto entry_rva = 0x%x;\n\n",
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vmctx.vm_entry_rva));
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result.append(
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"\tenum class calls : u32\n"
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"\t{\n");
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for (auto idx = 0u; idx < labels.size(); ++idx)
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result.append(string_format("\t\t%s = 0x%x,\n", labels[idx].label_name,
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labels[idx].enc_alloc_rva));
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result.append("\t};\n\n");
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result.append(
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string_format("\tinline _pair_t< u8, calls > call_map[%d] = \n"
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"\t{\n",
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labels.size()));
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for (auto idx = 0u; idx < labels.size(); ++idx)
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result.append(string_format("\t\t{ %d, calls::%s },\n", idx,
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labels[idx].label_name.c_str()));
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result.append("\t};\n\n");
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result.append(
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string_format("\t__declspec(align(1)) struct _gen_data\n"
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"\t{\n"
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"\t\tu8 bin[%d] =\n"
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"\t\t{\n"
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"\t\t\t%s\n",
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raw_file.size(), raw_file_array.c_str()));
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result.append("\t\t};\n\n");
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result.append(string_format("\t\tu8 map_area[0x%x];\n\n", vmctx.image_size));
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for (auto& label : labels) {
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result.append(string_format("\t\tu8 __%s_vinstrs[%d] =\n",
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label.label_name.c_str(),
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label.vinstrs.size()));
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result.append("\t\t{\n\t\t\t");
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for (auto& byte : label.vinstrs)
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result.append(string_format("0x%x, ", byte));
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result.append("\n\t\t};\n\n");
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}
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result.append(
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string_format("\t\tu8 __vmcall_shell_code[%d][15] =\n"
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"\t\t{\n",
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labels.size()));
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for (auto idx = 0u; idx < labels.size(); ++idx) {
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std::string jmp_code;
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// two push instructions...
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for (auto i = 0u; i < 2; ++i) {
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jmp_code.append("0x68, "); // push opcode...
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for (auto _idx = 0u; _idx < 4; ++_idx)
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jmp_code.append("0x0, ");
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}
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// one jmp instruction...
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jmp_code.append("0xE9, ");
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for (auto i = 0u; i < 4; ++i)
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jmp_code.append("0x0, ");
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result.append(string_format("\t\t\t{ %s },\n", jmp_code.c_str()));
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}
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result.append("\t\t};\n\n");
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result.append(R"( bool init()
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{
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static const auto _memcpy = []( void *dest, const void *src, size_t len ) -> void * {
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char *d = ( char * )dest;
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const char *s = ( char * )src;
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while ( len-- )
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*d++ = *s++;
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return dest;
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};
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const auto dos_header = reinterpret_cast< IMAGE_DOS_HEADER * >( bin );
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const auto nt_headers = reinterpret_cast< PIMAGE_NT_HEADERS64 >( bin + dos_header->e_lfanew );
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_memcpy( map_area, bin, nt_headers->OptionalHeader.SizeOfHeaders );
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auto sections = reinterpret_cast< PIMAGE_SECTION_HEADER >( ( u8 * )&nt_headers->OptionalHeader +
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nt_headers->FileHeader.SizeOfOptionalHeader );
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// map sections...
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for ( u32 i = 0; i < nt_headers->FileHeader.NumberOfSections; ++i )
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{
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PIMAGE_SECTION_HEADER section = §ions[ i ];
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_memcpy( ( void * )( map_area + section->VirtualAddress ),
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( void * )( bin + section->PointerToRawData ), section->SizeOfRawData );
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}
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// handle relocations...
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const auto reloc_dir = &nt_headers->OptionalHeader.DataDirectory[ IMAGE_DIRECTORY_ENTRY_BASERELOC ];
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if ( reloc_dir->VirtualAddress )
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{
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auto reloc = reinterpret_cast< IMAGE_BASE_RELOCATION * >( map_area + reloc_dir->VirtualAddress );
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for ( auto current_size = 0u; current_size < reloc_dir->Size; )
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{
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u32 reloc_count = ( reloc->SizeOfBlock - sizeof( IMAGE_BASE_RELOCATION ) ) / sizeof( u16 );
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u16 *reloc_data = ( u16 * )( ( u8 * )reloc + sizeof( IMAGE_BASE_RELOCATION ) );
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u8 *reloc_base = map_area + reloc->VirtualAddress;
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for ( auto idx = 0; idx < reloc_count; ++idx, ++reloc_data )
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{
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u16 data = *reloc_data;
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u16 type = data >> 12;
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u16 offset = data & 0xFFF;
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switch ( type )
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{
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case IMAGE_REL_BASED_ABSOLUTE:
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break;
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case IMAGE_REL_BASED_DIR64:
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{
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u64 *rva = ( u64 * )( reloc_base + offset );
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*rva = ( u64 )( map_area + ( *rva - nt_headers->OptionalHeader.ImageBase ) );
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break;
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}
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default:
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break;
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}
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}
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current_size += reloc->SizeOfBlock;
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reloc = ( IMAGE_BASE_RELOCATION * )reloc_data;
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}
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}
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// fix shellcode up...
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for ( auto idx = 0u; idx < ( sizeof( __vmcall_shell_code ) / 15 ); ++idx )
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{
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// first push encrypted rva value...
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*reinterpret_cast< u32 * >( &__vmcall_shell_code[ idx ][ 1 ] ) =
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static_cast< u32 >( call_map[ idx ].second );
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// second push encrypted rva value...
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*reinterpret_cast< u32 * >( &__vmcall_shell_code[ idx ][ 6 ] ) =
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static_cast< u32 >( call_map[ idx ].second );
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// signed rip relative rva to vm entry...
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*reinterpret_cast< u32 * >( &__vmcall_shell_code[ idx ][ 11 ] ) = reinterpret_cast< s32 >(
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( map_area - ( reinterpret_cast< u64 >( &__vmcall_shell_code[ idx ] ) + 15 ) ) + entry_rva );
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}
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return true; // only a bool so i can use static/call init only once...
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})");
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result.append("\n\t};\n\n");
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result.append(
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"\t__declspec(allocate(\".xmp2\")) inline _gen_data gen_data;\n\n");
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result.append(
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R"( template < calls e_call, class T, class ... Ts > auto call(const Ts... args) -> T
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{
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static auto __init_result = gen_data.init();
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__vmcall_t vmcall = nullptr;
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for ( auto idx = 0u; idx < sizeof( call_map ) / sizeof( _pair_t< u8, calls > ); ++idx )
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if ( call_map[ idx ].second == e_call )
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vmcall = reinterpret_cast< __vmcall_t >( &gen_data.__vmcall_shell_code[ idx ] );
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return reinterpret_cast< T >( vmcall( args... ) );
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})");
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result.append("\n}");
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return result;
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}
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} // namespace gen
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