1 files changed, 84 insertions, 0 deletions
diff --git a/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-Syscall.asm b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-Syscall.asm
new file mode 100644
index 00000000..e4facb9b
--- /dev/null
+++ b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-Syscall.asm
@@ -0,0 +1,84 @@
+; $Id: bs3-cmn-Syscall.asm $
+;; @file
+; BS3Kit - Bs3Syscall.
+;
+
+;
+; Copyright (C) 2007-2019 Oracle Corporation
+;
+; This file is part of VirtualBox Open Source Edition (OSE), as
+; available from http://www.virtualbox.org. This file is free software;
+; you can redistribute it and/or modify it under the terms of the GNU
+; General Public License (GPL) as published by the Free Software
+; Foundation, in version 2 as it comes in the "COPYING" file of the
+; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+;
+; The contents of this file may alternatively be used under the terms
+; of the Common Development and Distribution License Version 1.0
+; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+; VirtualBox OSE 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.
+;
+
+
+;*********************************************************************************************************************************
+;*  Header Files                                                                                                                 *
+;*********************************************************************************************************************************
+%include "bs3kit-template-header.mac"
+
+
+;*********************************************************************************************************************************
+;*  External Symbols                                                                                                             *
+;*********************************************************************************************************************************
+%if TMPL_BITS == 16
+BS3_EXTERN_DATA16 g_bBs3CurrentMode
+%endif
+BS3_EXTERN_DATA16 g_uBs3TrapEipHint
+TMPL_BEGIN_TEXT
+
+
+;;
+; Worker for doing a syscall - Assembly only.
+;
+; This worker deals with the needing to use a different opcode
+; sequence in v8086 mode as well as the high EIP word hint for
+; the weird PE16_32, PP16_32 and PAE16_32 modes.
+;
+; @uses     Whatever the syscall modified (xBX and XBP are always saved).
+;
+BS3_PROC_BEGIN_CMN Bs3Syscall, BS3_PBC_HYBRID_0_ARGS ; (all parameters are in registers)
+        push    xBP
+        mov     xBP, xSP
+        push    xBX
+
+%if TMPL_BITS == 32
+        mov     ebx, .return
+        xchg    ebx, [BS3_DATA16_WRT(g_uBs3TrapEipHint)]
+%elif TMPL_BITS == 16
+        test    byte [BS3_DATA16_WRT(g_bBs3CurrentMode)], BS3_MODE_CODE_V86
+        mov     bx, 0
+        xchg    bx, [2 + BS3_DATA16_WRT(g_uBs3TrapEipHint)]
+        jz      .normal
+
+        db      0xf0                    ; Lock prefix for causing #UD in V8086 mode.
+%endif
+.normal:
+        int     BS3_TRAP_SYSCALL
+
+.return:
+        ; Restore the EIP hint so the testcase code doesn't need to set it all the time.
+%if TMPL_BITS == 32
+        mov     [BS3_DATA16_WRT(g_uBs3TrapEipHint)], ebx
+%elif TMPL_BITS == 16
+        mov     [2 + BS3_DATA16_WRT(g_uBs3TrapEipHint)], bx
+%endif
+
+        pop     xBX
+        pop     xBP
+        BS3_HYBRID_RET
+BS3_PROC_END_CMN   Bs3Syscall
+