EXE: Add exception/crash dump handler

x64_dbg_exe/crashdump.cpp

@@ -0,0 +1,87 @@
+#include <windows.h>
+#include <dbghelp.h>
+#include <stdio.h>
+#include "crashdump.h"
+
+BOOL
+(WINAPI*
+ MiniDumpWriteDumpPtr)(
+     _In_ HANDLE hProcess,
+     _In_ DWORD ProcessId,
+     _In_ HANDLE hFile,
+     _In_ MINIDUMP_TYPE DumpType,
+     _In_opt_ PMINIDUMP_EXCEPTION_INFORMATION ExceptionParam,
+     _In_opt_ PMINIDUMP_USER_STREAM_INFORMATION UserStreamParam,
+     _In_opt_ PMINIDUMP_CALLBACK_INFORMATION CallbackParam
+ );
+
+void CrashDumpInitialize()
+{
+    // Find the DbgHelp module first
+    HMODULE module = LoadLibrary("dbghelp.dll");
+
+    if(module)
+        *(FARPROC*)&MiniDumpWriteDumpPtr = GetProcAddress(module, "MiniDumpWriteDump");
+
+    if(MiniDumpWriteDumpPtr)
+        AddVectoredExceptionHandler(0, CrashDumpVectoredHandler);
+}
+
+void CrashDumpFatal(const char* Format, ...)
+{
+    char buffer[1024];
+    va_list va;
+
+    va_start(va, Format);
+    vsnprintf_s(buffer, _TRUNCATE, Format, va);
+    va_end(va);
+
+    MessageBox(nullptr, buffer, "Error", MB_ICONERROR);
+}
+
+void CrashDumpCreate(EXCEPTION_POINTERS* ExceptionPointers)
+{
+    // Generate a crash dump file in the root directory
+    wchar_t dumpDir[MAX_PATH];
+    wchar_t currentDir[MAX_PATH];
+
+    if(!GetCurrentDirectoryW(ARRAYSIZE(currentDir), currentDir))
+    {
+        CrashDumpFatal("Unable to obtain current directory during crash dump\n");
+        return;
+    }
+
+    // Append the name
+    swprintf_s(dumpDir, L"%ws\\minidump-%p.dmp", currentDir, ExceptionPointers->ContextRecord->Rip);
+
+    // Open the file
+    HANDLE fileHandle = CreateFileW(dumpDir, GENERIC_READ | GENERIC_WRITE, 0, nullptr, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, nullptr);
+
+    if(fileHandle == INVALID_HANDLE_VALUE)
+    {
+        CrashDumpFatal("Failed to open file path '%ws' while generating crash dump\n", dumpDir);
+        return;
+    }
+
+    // Create the mini dump with DbgHelp
+    MINIDUMP_EXCEPTION_INFORMATION info;
+    memset(&info, 0, sizeof(MINIDUMP_EXCEPTION_INFORMATION));
+
+    info.ThreadId = GetCurrentThreadId();
+    info.ExceptionPointers = ExceptionPointers;
+    info.ClientPointers = TRUE;
+
+    if(!MiniDumpWriteDumpPtr(GetCurrentProcess(), GetCurrentProcessId(), fileHandle, MiniDumpNormal, &info, nullptr, nullptr))
+        CrashDumpFatal("MiniDumpWriteDump failed. Error: %u\n", GetLastError());
+
+    // Close the file & done
+    CloseHandle(fileHandle);
+}
+
+LONG CALLBACK CrashDumpVectoredHandler(EXCEPTION_POINTERS* ExceptionInfo)
+{
+    if(ExceptionInfo)
+        CrashDumpCreate(ExceptionInfo);
+
+    return EXCEPTION_CONTINUE_SEARCH;
+}

x64_dbg_exe/crashdump.h

@@ -0,0 +1,4 @@
+#pragma once
+
+void CrashDumpInitialize();
+LONG CALLBACK CrashDumpVectoredHandler(EXCEPTION_POINTERS* ExceptionInfo);

x64_dbg_exe/x64_dbg_exe.cpp

@@ -6,6 +6,7 @@
 
 #include <stdio.h>
 #include <windows.h>
+#include "crashdump.h"
 #include "..\x64_dbg_bridge\bridgemain.h"
 
 /**
@@ -23,6 +24,8 @@
 
 int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd)
 {
+    CrashDumpInitialize();
+
     const char* errormsg = BridgeInit();
     if(errormsg)
     {

x64_dbg_exe/x64_dbg_exe.vcxproj

@@ -19,9 +19,11 @@
     </ProjectConfiguration>
   </ItemGroup>
   <ItemGroup>
+    <ClCompile Include="crashdump.cpp" />
     <ClCompile Include="x64_dbg_exe.cpp" />
   </ItemGroup>
   <ItemGroup>
+    <ClInclude Include="crashdump.h" />
     <ClInclude Include="resource.h" />
   </ItemGroup>
   <ItemGroup>

x64_dbg_exe/x64_dbg_exe.vcxproj.filters

@@ -18,11 +18,17 @@
     <ClCompile Include="x64_dbg_exe.cpp">
       <Filter>Source Files</Filter>
     </ClCompile>
+    <ClCompile Include="crashdump.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="resource.h">
       <Filter>Header Files</Filter>
     </ClInclude>
+    <ClInclude Include="crashdump.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <ResourceCompile Include="resource.rc">