1 files changed, 108 insertions, 0 deletions
diff --git a/src/VBox/Runtime/common/compiler/vcc/guard-vcc.asm b/src/VBox/Runtime/common/compiler/vcc/guard-vcc.asm
new file mode 100644
index 00000000..42e6d5a8
--- /dev/null
+++ b/src/VBox/Runtime/common/compiler/vcc/guard-vcc.asm
@@ -0,0 +1,108 @@
+; $Id: guard-vcc.asm $
+;; @file
+; IPRT - Control Flow Guard related Visual C++ support routines.
+;
+
+;
+; Copyright (C) 2022-2023 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 "iprt/asmdefs.mac"
+%include "iprt/x86.mac"
+
+
+
+;*********************************************************************************************************************************
+;*  Global Variables                                                                                                             *
+;*********************************************************************************************************************************
+
+;
+; Points to a NOP icall checker by default.
+; The loader will replace this when we start advertising it in the load config.
+;
+section .0000cfg rdata align=8
+
+GLOBALNAME __guard_check_icall_fptr
+        RTCCPTR_DEF     NAME(__guard_check_icall_nop)
+
+%ifdef RT_ARCH_AMD64
+GLOBALNAME __guard_dispatch_icall_fptr
+        RTCCPTR_DEF     __guard_dispatch_icall_nop
+
+; xfg stuff (haven't seen it generated or used yet).
+GLOBALNAME __guard_xfg_check_icall_fptr
+        RTCCPTR_DEF     __guard_check_icall_nop
+
+GLOBALNAME __guard_xfg_dispatch_icall_fptr
+        RTCCPTR_DEF     __guard_xfg_dispatch_icall_nop
+
+GLOBALNAME __guard_xfg_table_dispatch_icall_fptr
+        RTCCPTR_DEF     __guard_xfg_dispatch_icall_nop
+
+%endif
+
+
+BEGINCODE
+;;
+; Check that doesn't do anything.
+;
+; This is for older windows versions which doesn't support call flow guard stuff.
+;
+BEGINPROC __guard_check_icall_nop
+        ret
+ENDPROC   __guard_check_icall_nop
+
+%ifdef RT_ARCH_AMD64
+;;
+; Target function in RAX
+;
+; This is for older windows versions which doesn't support call flow guard stuff.
+;
+BEGINPROC __guard_dispatch_icall_nop
+        jmp     rax
+ENDPROC   __guard_dispatch_icall_nop
+%endif
+
+%ifdef RT_ARCH_AMD64
+;;
+; Target function in RAX
+;
+; This is for windows versions which doesn't support extended call flow guard stuff.
+;
+BEGINPROC __guard_xfg_dispatch_icall_nop
+        jmp     [__guard_dispatch_icall_nop wrt RIP]
+ENDPROC   __guard_xfg_dispatch_icall_nop
+%endif
+