| 1 | ; $Id: bs3-cmn-Syscall.asm 82968 2020-02-04 10:35:17Z vboxsync $
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| 2 | ;; @file
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| 3 | ; BS3Kit - Bs3Syscall.
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| 4 | ;
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| 5 |
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| 6 | ;
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| 7 | ; Copyright (C) 2007-2020 Oracle Corporation
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| 8 | ;
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| 9 | ; This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | ; available from http://www.virtualbox.org. This file is free software;
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| 11 | ; you can redistribute it and/or modify it under the terms of the GNU
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| 12 | ; General Public License (GPL) as published by the Free Software
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| 13 | ; Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | ; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | ; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | ;
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| 17 | ; The contents of this file may alternatively be used under the terms
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| 18 | ; of the Common Development and Distribution License Version 1.0
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| 19 | ; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 20 | ; VirtualBox OSE distribution, in which case the provisions of the
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| 21 | ; CDDL are applicable instead of those of the GPL.
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| 22 | ;
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| 23 | ; You may elect to license modified versions of this file under the
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| 24 | ; terms and conditions of either the GPL or the CDDL or both.
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| 25 | ;
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| 26 |
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| 27 |
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| 28 | ;*********************************************************************************************************************************
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| 29 | ;* Header Files *
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| 30 | ;*********************************************************************************************************************************
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| 31 | %include "bs3kit-template-header.mac"
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| 32 |
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| 33 |
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| 34 | ;*********************************************************************************************************************************
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| 35 | ;* External Symbols *
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| 36 | ;*********************************************************************************************************************************
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| 37 | %if TMPL_BITS == 16
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| 38 | BS3_EXTERN_DATA16 g_bBs3CurrentMode
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| 39 | %endif
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| 40 | BS3_EXTERN_DATA16 g_uBs3TrapEipHint
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| 41 | TMPL_BEGIN_TEXT
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| 42 |
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| 43 |
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| 44 | ;;
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| 45 | ; Worker for doing a syscall - Assembly only.
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| 46 | ;
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| 47 | ; This worker deals with the needing to use a different opcode
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| 48 | ; sequence in v8086 mode as well as the high EIP word hint for
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| 49 | ; the weird PE16_32, PP16_32 and PAE16_32 modes.
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| 50 | ;
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| 51 | ; @uses Whatever the syscall modified (xBX and XBP are always saved).
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| 52 | ;
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| 53 | BS3_PROC_BEGIN_CMN Bs3Syscall, BS3_PBC_HYBRID_0_ARGS ; (all parameters are in registers)
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| 54 | push xBP
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| 55 | mov xBP, xSP
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| 56 | push xBX
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| 57 |
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| 58 | %if TMPL_BITS == 32
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| 59 | mov ebx, .return
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| 60 | xchg ebx, [BS3_DATA16_WRT(g_uBs3TrapEipHint)]
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| 61 | %elif TMPL_BITS == 16
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| 62 | test byte [BS3_DATA16_WRT(g_bBs3CurrentMode)], BS3_MODE_CODE_V86
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| 63 | mov bx, 0
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| 64 | xchg bx, [2 + BS3_DATA16_WRT(g_uBs3TrapEipHint)]
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| 65 | jz .normal
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| 66 |
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| 67 | db 0xf0 ; Lock prefix for causing #UD in V8086 mode.
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| 68 | %endif
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| 69 | .normal:
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| 70 | int BS3_TRAP_SYSCALL
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| 71 |
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| 72 | .return:
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| 73 | ; Restore the EIP hint so the testcase code doesn't need to set it all the time.
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| 74 | %if TMPL_BITS == 32
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| 75 | mov [BS3_DATA16_WRT(g_uBs3TrapEipHint)], ebx
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| 76 | %elif TMPL_BITS == 16
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| 77 | mov [2 + BS3_DATA16_WRT(g_uBs3TrapEipHint)], bx
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| 78 | %endif
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| 79 |
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| 80 | pop xBX
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| 81 | pop xBP
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| 82 | BS3_HYBRID_RET
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| 83 | BS3_PROC_END_CMN Bs3Syscall
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| 84 |
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