1 files changed, 113 insertions, 0 deletions
diff --git a/src/VBox/Runtime/VBox/logbackdoor.cpp b/src/VBox/Runtime/VBox/logbackdoor.cpp
new file mode 100644
index 00000000..230c3a59
--- /dev/null
+++ b/src/VBox/Runtime/VBox/logbackdoor.cpp
@@ -0,0 +1,113 @@
+/* $Id: logbackdoor.cpp $ */
+/** @file
+ * VirtualBox Runtime - Guest Backdoor Logging.
+ */
+
+/*
+ * Copyright (C) 2006-2023 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, in version 3 of the
+ * License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
+ * in the VirtualBox distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include <VBox/log.h>
+#include "internal/iprt.h"
+#if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
+# include <iprt/asm-amd64-x86.h>
+#endif
+#include <iprt/string.h>
+#ifdef IN_GUEST_R3
+# include <VBox/VBoxGuestLib.h>
+#endif
+
+
+/*********************************************************************************************************************************
+*   Internal Functions                                                                                                           *
+*********************************************************************************************************************************/
+static DECLCALLBACK(size_t) rtLogBackdoorOutput(void *pv, const char *pachChars, size_t cbChars);
+
+
+RTDECL(size_t) RTLogBackdoorPrintf(const char *pszFormat, ...)
+{
+    va_list args;
+    size_t cb;
+
+    va_start(args, pszFormat);
+    cb = RTLogBackdoorPrintfV(pszFormat, args);
+    va_end(args);
+
+    return cb;
+}
+
+RT_EXPORT_SYMBOL(RTLogBackdoorPrintf);
+
+
+RTDECL(size_t) RTLogBackdoorPrintfV(const char *pszFormat, va_list args)
+{
+    return RTLogFormatV(rtLogBackdoorOutput, NULL, pszFormat, args);
+}
+
+RT_EXPORT_SYMBOL(RTLogBackdoorPrintfV);
+
+
+/**
+ * Callback for RTLogFormatV which writes to the backdoor.
+ * See PFNRTSTROUTPUT() for details.
+ */
+static DECLCALLBACK(size_t) rtLogBackdoorOutput(void *pvArg, const char *pachChars, size_t cbChars)
+{
+    RT_NOREF_PV(pvArg);
+    RTLogWriteUser(pachChars, cbChars);
+    return cbChars;
+}
+
+
+RTDECL(void) RTLogWriteUser(const char *pch, size_t cb)
+{
+#ifdef IN_GUEST_R3
+    VbglR3WriteLog(pch, cb);
+#else  /* !IN_GUEST_R3 */
+# if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
+    const uint8_t *pau8 = (const uint8_t *)pch;
+    if (cb > 1)
+        ASMOutStrU8(RTLOG_DEBUG_PORT, pau8, cb);
+    else if (cb)
+        ASMOutU8(RTLOG_DEBUG_PORT, *pau8);
+# else
+    /** @todo port me */
+    RT_NOREF(pch, cb);
+    RT_BREAKPOINT();
+# endif
+#endif /* !IN_GUEST_R3 */
+}
+
+RT_EXPORT_SYMBOL(RTLogWriteUser);
+