diff options
Diffstat (limited to 'src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-Syscall.asm')
| -rw-r--r-- | src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-Syscall.asm | 94 |
1 files changed, 94 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..6fad4703 --- /dev/null +++ b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-Syscall.asm @@ -0,0 +1,94 @@ +; $Id: bs3-cmn-Syscall.asm $ +;; @file +; BS3Kit - Bs3Syscall. +; + +; +; Copyright (C) 2007-2023 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 "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 + |