1 files changed, 202 insertions, 0 deletions
diff --git a/src/yuzu/mini_dump.cpp b/src/yuzu/mini_dump.cpp
new file mode 100644
index 000000000..a34dc6a9c
--- /dev/null
+++ b/src/yuzu/mini_dump.cpp
@@ -0,0 +1,202 @@
+// SPDX-FileCopyrightText: 2022 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <cstdio>
+#include <cstring>
+#include <ctime>
+#include <filesystem>
+#include <fmt/format.h>
+#include <windows.h>
+#include "yuzu/mini_dump.h"
+#include "yuzu/startup_checks.h"
+
+// dbghelp.h must be included after windows.h
+#include <dbghelp.h>
+
+namespace MiniDump {
+
+void CreateMiniDump(HANDLE process_handle, DWORD process_id, MINIDUMP_EXCEPTION_INFORMATION* info,
+                    EXCEPTION_POINTERS* pep) {
+    char file_name[255];
+    const std::time_t the_time = std::time(nullptr);
+    std::strftime(file_name, 255, "yuzu-crash-%Y%m%d%H%M%S.dmp", std::localtime(&the_time));
+
+    // Open the file
+    HANDLE file_handle = CreateFileA(file_name, GENERIC_READ | GENERIC_WRITE, 0, nullptr,
+                                     CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, nullptr);
+
+    if (file_handle == nullptr || file_handle == INVALID_HANDLE_VALUE) {
+        fmt::print(stderr, "CreateFileA failed. Error: {}", GetLastError());
+        return;
+    }
+
+    // Create the minidump
+    const MINIDUMP_TYPE dump_type = MiniDumpNormal;
+
+    const bool write_dump_status = MiniDumpWriteDump(process_handle, process_id, file_handle,
+                                                     dump_type, (pep != 0) ? info : 0, 0, 0);
+
+    if (write_dump_status) {
+        fmt::print(stderr, "MiniDump created: {}", file_name);
+    } else {
+        fmt::print(stderr, "MiniDumpWriteDump failed. Error: {}", GetLastError());
+    }
+
+    // Close the file
+    CloseHandle(file_handle);
+}
+
+void DumpFromDebugEvent(DEBUG_EVENT& deb_ev, PROCESS_INFORMATION& pi) {
+    EXCEPTION_RECORD& record = deb_ev.u.Exception.ExceptionRecord;
+
+    HANDLE thread_handle = OpenThread(THREAD_GET_CONTEXT, false, deb_ev.dwThreadId);
+    if (thread_handle == nullptr) {
+        fmt::print(stderr, "OpenThread failed ({})", GetLastError());
+        return;
+    }
+
+    // Get child process context
+    CONTEXT context = {};
+    context.ContextFlags = CONTEXT_ALL;
+    if (!GetThreadContext(thread_handle, &context)) {
+        fmt::print(stderr, "GetThreadContext failed ({})", GetLastError());
+        return;
+    }
+
+    // Create exception pointers for minidump
+    EXCEPTION_POINTERS ep;
+    ep.ExceptionRecord = &record;
+    ep.ContextRecord = &context;
+
+    MINIDUMP_EXCEPTION_INFORMATION info;
+    info.ThreadId = deb_ev.dwThreadId;
+    info.ExceptionPointers = &ep;
+    info.ClientPointers = false;
+
+    CreateMiniDump(pi.hProcess, pi.dwProcessId, &info, &ep);
+
+    if (CloseHandle(thread_handle) == 0) {
+        fmt::print(stderr, "error: CloseHandle(thread_handle) failed ({})", GetLastError());
+    }
+}
+
+bool SpawnDebuggee(const char* arg0, PROCESS_INFORMATION& pi) {
+    std::memset(&pi, 0, sizeof(pi));
+
+    // Don't debug if we are already being debugged
+    if (IsDebuggerPresent()) {
+        return false;
+    }
+
+    if (!SpawnChild(arg0, &pi, 0)) {
+        fmt::print(stderr, "warning: continuing without crash dumps");
+        return false;
+    }
+
+    const bool can_debug = DebugActiveProcess(pi.dwProcessId);
+    if (!can_debug) {
+        fmt::print(stderr,
+                   "warning: DebugActiveProcess failed ({}), continuing without crash dumps",
+                   GetLastError());
+        return false;
+    }
+
+    return true;
+}
+
+static const char* ExceptionName(DWORD exception) {
+    switch (exception) {
+    case EXCEPTION_ACCESS_VIOLATION:
+        return "EXCEPTION_ACCESS_VIOLATION";
+    case EXCEPTION_DATATYPE_MISALIGNMENT:
+        return "EXCEPTION_DATATYPE_MISALIGNMENT";
+    case EXCEPTION_BREAKPOINT:
+        return "EXCEPTION_BREAKPOINT";
+    case EXCEPTION_SINGLE_STEP:
+        return "EXCEPTION_SINGLE_STEP";
+    case EXCEPTION_ARRAY_BOUNDS_EXCEEDED:
+        return "EXCEPTION_ARRAY_BOUNDS_EXCEEDED";
+    case EXCEPTION_FLT_DENORMAL_OPERAND:
+        return "EXCEPTION_FLT_DENORMAL_OPERAND";
+    case EXCEPTION_FLT_DIVIDE_BY_ZERO:
+        return "EXCEPTION_FLT_DIVIDE_BY_ZERO";
+    case EXCEPTION_FLT_INEXACT_RESULT:
+        return "EXCEPTION_FLT_INEXACT_RESULT";
+    case EXCEPTION_FLT_INVALID_OPERATION:
+        return "EXCEPTION_FLT_INVALID_OPERATION";
+    case EXCEPTION_FLT_OVERFLOW:
+        return "EXCEPTION_FLT_OVERFLOW";
+    case EXCEPTION_FLT_STACK_CHECK:
+        return "EXCEPTION_FLT_STACK_CHECK";
+    case EXCEPTION_FLT_UNDERFLOW:
+        return "EXCEPTION_FLT_UNDERFLOW";
+    case EXCEPTION_INT_DIVIDE_BY_ZERO:
+        return "EXCEPTION_INT_DIVIDE_BY_ZERO";
+    case EXCEPTION_INT_OVERFLOW:
+        return "EXCEPTION_INT_OVERFLOW";
+    case EXCEPTION_PRIV_INSTRUCTION:
+        return "EXCEPTION_PRIV_INSTRUCTION";
+    case EXCEPTION_IN_PAGE_ERROR:
+        return "EXCEPTION_IN_PAGE_ERROR";
+    case EXCEPTION_ILLEGAL_INSTRUCTION:
+        return "EXCEPTION_ILLEGAL_INSTRUCTION";
+    case EXCEPTION_NONCONTINUABLE_EXCEPTION:
+        return "EXCEPTION_NONCONTINUABLE_EXCEPTION";
+    case EXCEPTION_STACK_OVERFLOW:
+        return "EXCEPTION_STACK_OVERFLOW";
+    case EXCEPTION_INVALID_DISPOSITION:
+        return "EXCEPTION_INVALID_DISPOSITION";
+    case EXCEPTION_GUARD_PAGE:
+        return "EXCEPTION_GUARD_PAGE";
+    case EXCEPTION_INVALID_HANDLE:
+        return "EXCEPTION_INVALID_HANDLE";
+    default:
+        return "unknown exception type";
+    }
+}
+
+void DebugDebuggee(PROCESS_INFORMATION& pi) {
+    DEBUG_EVENT deb_ev = {};
+
+    while (deb_ev.dwDebugEventCode != EXIT_PROCESS_DEBUG_EVENT) {
+        const bool wait_success = WaitForDebugEvent(&deb_ev, INFINITE);
+        if (!wait_success) {
+            fmt::print(stderr, "error: WaitForDebugEvent failed ({})", GetLastError());
+            return;
+        }
+
+        switch (deb_ev.dwDebugEventCode) {
+        case OUTPUT_DEBUG_STRING_EVENT:
+        case CREATE_PROCESS_DEBUG_EVENT:
+        case CREATE_THREAD_DEBUG_EVENT:
+        case EXIT_PROCESS_DEBUG_EVENT:
+        case EXIT_THREAD_DEBUG_EVENT:
+        case LOAD_DLL_DEBUG_EVENT:
+        case RIP_EVENT:
+        case UNLOAD_DLL_DEBUG_EVENT:
+            // Continue on all other debug events
+            ContinueDebugEvent(deb_ev.dwProcessId, deb_ev.dwThreadId, DBG_CONTINUE);
+            break;
+        case EXCEPTION_DEBUG_EVENT:
+            EXCEPTION_RECORD& record = deb_ev.u.Exception.ExceptionRecord;
+
+            // We want to generate a crash dump if we are seeing the same exception again.
+            if (!deb_ev.u.Exception.dwFirstChance) {
+                fmt::print(stderr, "Creating MiniDump on ExceptionCode: 0x{:08x} {}\n",
+                           record.ExceptionCode, ExceptionName(record.ExceptionCode));
+                DumpFromDebugEvent(deb_ev, pi);
+            }
+
+            // Continue without handling the exception.
+            // Lets the debuggee use its own exception handler.
+            // - If one does not exist, we will see the exception once more where we make a minidump
+            //     for. Then when it reaches here again, yuzu will probably crash.
+            // - DBG_CONTINUE on an exception that the debuggee does not handle can set us up for an
+            //     infinite loop of exceptions.
+            ContinueDebugEvent(deb_ev.dwProcessId, deb_ev.dwThreadId, DBG_EXCEPTION_NOT_HANDLED);
+            break;
+        }
+    }
+}
+
+} // namespace MiniDump