| 1 | ; $Id: bs3-c32-Trap32Generic.asm 59984 2016-03-11 00:56:10Z vboxsync $
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| 2 | ;; @file
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| 3 | ; BS3Kit - Trap, 32-bit assembly handlers.
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| 4 | ;
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| 5 |
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| 6 | ;
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| 7 | ; Copyright (C) 2007-2016 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 | ;* Header Files *
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| 29 | ;*********************************************************************************************************************************
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| 30 | %include "bs3kit-template-header.mac"
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| 31 |
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| 32 | %ifndef TMPL_32BIT
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| 33 | %error "32-bit only template"
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| 34 | %endif
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| 35 |
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| 36 |
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| 37 | ;*********************************************************************************************************************************
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| 38 | ;* External Symbols *
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| 39 | ;*********************************************************************************************************************************
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| 40 | BS3_EXTERN_DATA16 g_bBs3CurrentMode
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| 41 | TMPL_BEGIN_TEXT
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| 42 | BS3_EXTERN_CMN Bs3TrapDefaultHandler
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| 43 | BS3_EXTERN_CMN Bs3RegCtxRestore
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| 44 | TMPL_BEGIN_TEXT
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| 45 |
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| 46 |
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| 47 | ;*********************************************************************************************************************************
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| 48 | ;* Global Variables *
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| 49 | ;*********************************************************************************************************************************
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| 50 | BS3_BEGIN_DATA16
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| 51 | ;; Easy to access flat address of Bs3Trap32GenericEntries.
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| 52 | BS3_GLOBAL_DATA g_Bs3Trap32GenericEntriesFlatAddr, 4
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| 53 | dd Bs3Trap32GenericEntries wrt FLAT
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| 54 | ;; Easy to access flat address of Bs3Trap32DoubleFaultHandler.
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| 55 | BS3_GLOBAL_DATA g_Bs3Trap32DoubleFaultHandlerFlatAddr, 4
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| 56 | dd Bs3Trap32DoubleFaultHandler wrt FLAT
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| 57 |
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| 58 | BS3_BEGIN_DATA32
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| 59 | ;; Pointer C trap handlers.
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| 60 | BS3_GLOBAL_DATA g_apfnBs3TrapHandlers_c32, 1024
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| 61 | resd 256
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| 62 |
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| 63 |
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| 64 |
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| 65 | ;;
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| 66 | ; Generic entry points for IDT handlers, 8 byte spacing.
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| 67 | ;
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| 68 | BS3_PROC_BEGIN Bs3Trap32GenericEntries
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| 69 | %macro Bs3Trap32GenericEntry 1
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| 70 | db 06ah, i ; push imm8 - note that this is a signextended value.
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| 71 | jmp %1
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| 72 | ALIGNCODE(8)
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| 73 | %assign i i+1
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| 74 | %endmacro
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| 75 |
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| 76 | %assign i 0 ; start counter.
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| 77 | Bs3Trap32GenericEntry bs3Trap32GenericTrapOrInt ; 0
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| 78 | Bs3Trap32GenericEntry bs3Trap32GenericTrapOrInt ; 1
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| 79 | Bs3Trap32GenericEntry bs3Trap32GenericTrapOrInt ; 2
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| 80 | Bs3Trap32GenericEntry bs3Trap32GenericTrapOrInt ; 3
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| 81 | Bs3Trap32GenericEntry bs3Trap32GenericTrapOrInt ; 4
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| 82 | Bs3Trap32GenericEntry bs3Trap32GenericTrapOrInt ; 5
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| 83 | Bs3Trap32GenericEntry bs3Trap32GenericTrapOrInt ; 6
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| 84 | Bs3Trap32GenericEntry bs3Trap32GenericTrapOrInt ; 7
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| 85 | Bs3Trap32GenericEntry bs3Trap32GenericTrapErrCode ; 8
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| 86 | Bs3Trap32GenericEntry bs3Trap32GenericTrapOrInt ; 9
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| 87 | Bs3Trap32GenericEntry bs3Trap32GenericTrapErrCode ; a
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| 88 | Bs3Trap32GenericEntry bs3Trap32GenericTrapErrCode ; b
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| 89 | Bs3Trap32GenericEntry bs3Trap32GenericTrapErrCode ; c
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| 90 | Bs3Trap32GenericEntry bs3Trap32GenericTrapErrCode ; d
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| 91 | Bs3Trap32GenericEntry bs3Trap32GenericTrapErrCode ; e
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| 92 | Bs3Trap32GenericEntry bs3Trap32GenericTrapOrInt ; f (reserved)
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| 93 | Bs3Trap32GenericEntry bs3Trap32GenericTrapOrInt ; 10
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| 94 | Bs3Trap32GenericEntry bs3Trap32GenericTrapErrCode ; 11
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| 95 | Bs3Trap32GenericEntry bs3Trap32GenericTrapOrInt ; 12
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| 96 | Bs3Trap32GenericEntry bs3Trap32GenericTrapOrInt ; 13
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| 97 | Bs3Trap32GenericEntry bs3Trap32GenericTrapOrInt ; 14
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| 98 | Bs3Trap32GenericEntry bs3Trap32GenericTrapOrInt ; 15 (reserved)
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| 99 | Bs3Trap32GenericEntry bs3Trap32GenericTrapOrInt ; 16 (reserved)
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| 100 | Bs3Trap32GenericEntry bs3Trap32GenericTrapOrInt ; 17 (reserved)
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| 101 | Bs3Trap32GenericEntry bs3Trap32GenericTrapOrInt ; 18 (reserved)
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| 102 | Bs3Trap32GenericEntry bs3Trap32GenericTrapOrInt ; 19 (reserved)
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| 103 | Bs3Trap32GenericEntry bs3Trap32GenericTrapOrInt ; 1a (reserved)
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| 104 | Bs3Trap32GenericEntry bs3Trap32GenericTrapOrInt ; 1b (reserved)
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| 105 | Bs3Trap32GenericEntry bs3Trap32GenericTrapOrInt ; 1c (reserved)
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| 106 | Bs3Trap32GenericEntry bs3Trap32GenericTrapOrInt ; 1d (reserved)
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| 107 | Bs3Trap32GenericEntry bs3Trap32GenericTrapErrCode ; 1e
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| 108 | Bs3Trap32GenericEntry bs3Trap32GenericTrapOrInt ; 1f (reserved)
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| 109 | %rep 224
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| 110 | Bs3Trap32GenericEntry bs3Trap32GenericTrapOrInt
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| 111 | %endrep
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| 112 | BS3_PROC_END Bs3Trap32GenericEntries
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| 113 |
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| 114 |
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| 115 |
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| 116 |
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| 117 | ;;
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| 118 | ; Trap or interrupt (no error code).
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| 119 | ;
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| 120 | BS3_PROC_BEGIN bs3Trap32GenericTrapOrInt
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| 121 | pushfd
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| 122 | cli
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| 123 | cld
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| 124 |
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| 125 | sub esp, BS3TRAPFRAME_size
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| 126 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.rax], eax
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| 127 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.rbp], ebp
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| 128 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.rdx], edx
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| 129 | lea ebp, [esp + BS3TRAPFRAME_size + 4] ; iret - 4 (i.e. ebp frame chain location)
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| 130 |
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| 131 | mov edx, [esp + BS3TRAPFRAME_size]
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| 132 | mov [esp + BS3TRAPFRAME.fHandlerRfl], edx
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| 133 |
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| 134 | movzx edx, byte [esp + BS3TRAPFRAME_size + 4]
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| 135 | mov [esp + BS3TRAPFRAME.bXcpt], edx
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| 136 |
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| 137 | xor edx, edx
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| 138 | mov [esp + BS3TRAPFRAME.uErrCd], edx
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| 139 | mov [esp + BS3TRAPFRAME.uErrCd + 4], edx
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| 140 | jmp bs3Trap32GenericCommon
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| 141 | BS3_PROC_END bs3Trap32GenericTrapOrInt
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| 142 |
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| 143 |
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| 144 | ;;
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| 145 | ; Trap with error code.
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| 146 | ;
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| 147 | BS3_PROC_BEGIN bs3Trap32GenericTrapErrCode
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| 148 | pushfd
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| 149 | cli
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| 150 | cld
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| 151 |
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| 152 | sub esp, BS3TRAPFRAME_size
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| 153 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.rax], eax
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| 154 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.rbp], ebp
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| 155 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.rdx], edx
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| 156 | lea ebp, [esp + BS3TRAPFRAME_size + 8] ; iret - 4 (i.e. ebp frame chain location)
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| 157 |
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| 158 | mov edx, [esp + BS3TRAPFRAME_size]
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| 159 | mov [esp + BS3TRAPFRAME.fHandlerRfl], edx
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| 160 |
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| 161 | movzx edx, byte [esp + BS3TRAPFRAME_size + 4]
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| 162 | mov [esp + BS3TRAPFRAME.bXcpt], edx
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| 163 |
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| 164 | mov edx, [esp + BS3TRAPFRAME_size + 8]
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| 165 | ;; @todo Do voodoo checks for 'int xx' or misguided hardware interrupts.
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| 166 | mov [esp + BS3TRAPFRAME.uErrCd], edx
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| 167 | xor edx, edx
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| 168 | mov [esp + BS3TRAPFRAME.uErrCd + 4], edx
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| 169 | jmp bs3Trap32GenericCommon
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| 170 | BS3_PROC_END bs3Trap32GenericTrapErrCode
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| 171 |
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| 172 |
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| 173 | ;;
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| 174 | ; Common context saving code and dispatching.
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| 175 | ;
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| 176 | ; @param esp Pointer to the trap frame. The following members have been
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| 177 | ; filled in by the previous code:
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| 178 | ; - bXcpt
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| 179 | ; - uErrCd
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| 180 | ; - fHandlerRFL
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| 181 | ; - Ctx.eax (except upper dword)
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| 182 | ; - Ctx.edx (except upper dword)
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| 183 | ; - Ctx.ebp (except upper dword)
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| 184 | ;
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| 185 | ; @param ebp Pointer to the dword before the iret frame, i.e. where ebp
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| 186 | ; would be saved if this was a normal call.
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| 187 | ; @param edx Zero (0).
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| 188 | ;
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| 189 | BS3_PROC_BEGIN bs3Trap32GenericCommon
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| 190 | ;
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| 191 | ; Fake EBP frame.
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| 192 | ;
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| 193 | mov eax, [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.rbp]
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| 194 | mov [ebp], eax
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| 195 |
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| 196 | ;
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| 197 | ; Save the remaining GPRs and segment registers.
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| 198 | ;
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| 199 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.rcx], ecx
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| 200 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.rbx], ebx
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| 201 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.rdi], edi
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| 202 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.rsi], esi
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| 203 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.ds], ds
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| 204 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.es], es
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| 205 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.fs], fs
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| 206 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.gs], gs
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| 207 |
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| 208 | ;
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| 209 | ; Load 32-bit data selector for the DPL we're executing at into DS and ES.
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| 210 | ; Save the handler SS and CS values first.
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| 211 | ;
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| 212 | mov ax, cs
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| 213 | mov [esp + BS3TRAPFRAME.uHandlerCs], ax
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| 214 | mov ax, ss
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| 215 | mov [esp + BS3TRAPFRAME.uHandlerSs], ax
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| 216 | and ax, 3
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| 217 | mov cx, ax
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| 218 | shl ax, BS3_SEL_RING_SHIFT
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| 219 | or ax, cx
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| 220 | add ax, BS3_SEL_R0_DS32
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| 221 | mov ds, ax
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| 222 | mov es, ax
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| 223 |
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| 224 | ;
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| 225 | ; Copy and update the mode now that we've got a flat DS.
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| 226 | ;
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| 227 | mov al, [BS3_DATA16_WRT(g_bBs3CurrentMode)]
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| 228 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.bMode], al
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| 229 | and al, ~BS3_MODE_CODE_MASK
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| 230 | or al, BS3_MODE_CODE_32
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| 231 | mov [BS3_DATA16_WRT(g_bBs3CurrentMode)], al
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| 232 |
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| 233 | ;
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| 234 | ; Copy iret info.
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| 235 | ;
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| 236 | mov ecx, [ebp + 4]
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| 237 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.rip], ecx
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| 238 | mov ecx, [ebp + 12]
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| 239 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.rflags], ecx
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| 240 | mov cx, [ebp + 8]
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| 241 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.cs], cx
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| 242 | test dword [ebp + 12], X86_EFL_VM
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| 243 | jnz .iret_frame_v8086
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| 244 | mov ax, ss
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| 245 | and al, 3
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| 246 | and cl, 3
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| 247 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.bCpl], cl
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| 248 | cmp cl, al
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| 249 | je .iret_frame_same_cpl
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| 250 |
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| 251 | .iret_frame_different_cpl:
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| 252 | mov ecx, [ebp + 16]
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| 253 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.rsp], ecx
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| 254 | mov cx, [ebp + 20]
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| 255 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.ss], cx
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| 256 | lea eax, [ebp + 24]
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| 257 | mov [esp + BS3TRAPFRAME.uHandlerRsp], eax
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| 258 | jmp .iret_frame_done
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| 259 |
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| 260 | .iret_frame_same_cpl:
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| 261 | lea ecx, [ebp + 12]
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| 262 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.rsp], ecx
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| 263 | mov [esp + BS3TRAPFRAME.uHandlerRsp], ecx
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| 264 | mov cx, ss
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| 265 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.ss], cx
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| 266 | jmp .iret_frame_done
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| 267 |
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| 268 | .iret_frame_v8086:
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| 269 | mov byte [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.bCpl], 3
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| 270 | or byte [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.bMode], BS3_MODE_CODE_V86 ; paranoia ^ 2
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| 271 | movzx ecx, word [ebp + 16]
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| 272 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.rsp], ecx
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| 273 | mov cx, [ebp + 20]
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| 274 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.ss], cx
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| 275 | mov cx, [ebp + 24]
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| 276 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.es], cx
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| 277 | mov cx, [ebp + 28]
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| 278 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.ds], cx
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| 279 | mov cx, [ebp + 32]
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| 280 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.fs], cx
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| 281 | mov cx, [ebp + 36]
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| 282 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.gs], cx
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| 283 | lea eax, [ebp + 40]
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| 284 | mov [esp + BS3TRAPFRAME.uHandlerRsp], eax
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| 285 | jmp .iret_frame_done
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| 286 |
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| 287 | .iret_frame_done:
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| 288 | ;
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| 289 | ; Control registers.
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| 290 | ;
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| 291 | mov eax, cr0
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| 292 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.cr0], eax
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| 293 | mov eax, cr2
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| 294 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.cr2], eax
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| 295 | mov eax, cr3
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| 296 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.cr3], eax
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| 297 | mov eax, cr4
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| 298 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.cr4], eax
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| 299 | str ax
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| 300 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.tr], ax
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| 301 | sldt ax
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| 302 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.ldtr], ax
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| 303 |
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| 304 | ;
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| 305 | ; Set context bit width and clear all upper dwords and unused register members.
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| 306 | ;
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| 307 | .clear_and_dispatch_to_handler: ; The double fault code joins us here.
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| 308 | xor edx, edx
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| 309 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.abPadding], dx
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| 310 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.abPadding + 2], edx
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| 311 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.rax + 4], edx
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| 312 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.rcx + 4], edx
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| 313 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.rdx + 4], edx
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| 314 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.rbx + 4], edx
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| 315 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.rsp + 4], edx
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| 316 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.rbp + 4], edx
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| 317 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.rsi + 4], edx
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| 318 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.rdi + 4], edx
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| 319 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.r8 + 4], edx
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| 320 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.r9 + 4], edx
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| 321 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.r10 + 4], edx
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| 322 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.r11 + 4], edx
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| 323 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.r12 + 4], edx
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| 324 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.r13 + 4], edx
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| 325 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.r14 + 4], edx
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| 326 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.r15 + 4], edx
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| 327 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.rflags + 4], edx
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| 328 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.rip + 4], edx
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| 329 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.cr0 + 4], edx
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| 330 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.cr2 + 4], edx
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| 331 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.cr3 + 4], edx
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| 332 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.cr4 + 4], edx
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| 333 |
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| 334 | ;
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| 335 | ; Dispatch it to C code.
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| 336 | ;
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| 337 | movzx ebx, byte [esp + BS3TRAPFRAME.bXcpt]
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| 338 | mov eax, [ebx * 4 + BS3_DATA16_WRT(_g_apfnBs3TrapHandlers_c32)]
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| 339 | or eax, eax
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| 340 | jnz .call_handler
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| 341 | mov eax, Bs3TrapDefaultHandler
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| 342 | .call_handler:
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| 343 | mov edi, esp
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| 344 | push edi
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| 345 | call eax
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| 346 |
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| 347 | ;
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| 348 | ; Resume execution using trap frame.
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| 349 | ;
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| 350 | push 0
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| 351 | add edi, BS3TRAPFRAME.Ctx
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| 352 | push edi
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| 353 | call Bs3RegCtxRestore
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| 354 | .panic:
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| 355 | hlt
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| 356 | jmp .panic
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| 357 | BS3_PROC_END bs3Trap32GenericCommon
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| 358 |
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| 359 |
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| 360 | ;;
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| 361 | ; Helper.
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| 362 | ;
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| 363 | ; @retruns Flat address in eax.
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| 364 | ; @param ax
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| 365 | ; @uses eax
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| 366 | ;
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| 367 | bs3Trap32TssInAxToFlatInEax:
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| 368 | ; Get the GDT base address and find the descriptor address (EAX)
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| 369 | sub esp, 8+2
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| 370 | sgdt [esp]
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| 371 | and eax, 0fff8h
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| 372 | add eax, [esp + 2] ; GDT base address.
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| 373 | add esp, 8+2
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| 374 |
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| 375 | ; Get the flat TSS address from the descriptor.
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| 376 | mov al, [eax + (X86DESCGENERIC_BIT_OFF_BASE_HIGH1 / 8)]
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| 377 | mov ah, [eax + (X86DESCGENERIC_BIT_OFF_BASE_HIGH2 / 8)]
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| 378 | shl eax, 16
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| 379 | mov ax, [eax + (X86DESCGENERIC_BIT_OFF_BASE_LOW / 8)]
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| 380 | ret
|
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| 381 |
|
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| 382 | ;;
|
|---|
| 383 | ; Double fault handler.
|
|---|
| 384 | ;
|
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| 385 | ; We don't have to load any selectors or clear anything in EFLAGS because the
|
|---|
| 386 | ; TSS specified sane values which got loaded during the task switch.
|
|---|
| 387 | ;
|
|---|
| 388 | BS3_PROC_BEGIN Bs3Trap32DoubleFaultHandler
|
|---|
| 389 | push 0 ; We'll copy the rip from the other TSS here later to create a more sensible call chain.
|
|---|
| 390 | push ebp
|
|---|
| 391 | mov ebp, esp
|
|---|
| 392 |
|
|---|
| 393 | ;
|
|---|
| 394 | ; Fill in the non-context trap frame bits.
|
|---|
| 395 | ;
|
|---|
| 396 | pushfd ; Get handler flags.
|
|---|
| 397 | pop ecx
|
|---|
| 398 | xor edx, edx ; NULL register.
|
|---|
| 399 |
|
|---|
| 400 | sub esp, BS3TRAPFRAME_size ; Allocate trap frame.
|
|---|
| 401 | mov [esp + BS3TRAPFRAME.fHandlerRfl], ecx
|
|---|
| 402 | mov word [esp + BS3TRAPFRAME.bXcpt], X86_XCPT_DF
|
|---|
| 403 | mov [esp + BS3TRAPFRAME.uHandlerCs], cs
|
|---|
| 404 | mov [esp + BS3TRAPFRAME.uHandlerSs], ss
|
|---|
| 405 | lea ecx, [ebp + 12]
|
|---|
| 406 | mov [esp + BS3TRAPFRAME.uHandlerRsp], ecx
|
|---|
| 407 | mov [esp + BS3TRAPFRAME.uHandlerRsp + 4], edx
|
|---|
| 408 | mov ecx, [ebp + 8]
|
|---|
| 409 | mov [esp + BS3TRAPFRAME.uErrCd], ecx
|
|---|
| 410 | mov [esp + BS3TRAPFRAME.uErrCd + 4], edx
|
|---|
| 411 |
|
|---|
| 412 | ;
|
|---|
| 413 | ; Copy the register state from the previous task segment.
|
|---|
| 414 | ;
|
|---|
| 415 |
|
|---|
| 416 | ; Find our TSS.
|
|---|
| 417 | str ax
|
|---|
| 418 | call bs3Trap32TssInAxToFlatInEax
|
|---|
| 419 |
|
|---|
| 420 | ; Find the previous TSS.
|
|---|
| 421 | mov ax, [eax + X86TSS32.selPrev]
|
|---|
| 422 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.tr], ax
|
|---|
| 423 | call bs3Trap32TssInAxToFlatInEax
|
|---|
| 424 |
|
|---|
| 425 | ; Do the copying.
|
|---|
| 426 | mov ecx, [eax + X86TSS32.eax]
|
|---|
| 427 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.rax], ecx
|
|---|
| 428 | mov ecx, [eax + X86TSS32.ecx]
|
|---|
| 429 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.rcx], ecx
|
|---|
| 430 | mov ecx, [eax + X86TSS32.edx]
|
|---|
| 431 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.rdx], ecx
|
|---|
| 432 | mov ecx, [eax + X86TSS32.ebx]
|
|---|
| 433 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.rbx], ecx
|
|---|
| 434 | mov ecx, [eax + X86TSS32.esp]
|
|---|
| 435 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.rsp], ecx
|
|---|
| 436 | mov ecx, [eax + X86TSS32.ebp]
|
|---|
| 437 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.rbp], ecx
|
|---|
| 438 | mov [ebp], ecx ; For better call stacks.
|
|---|
| 439 | mov ecx, [eax + X86TSS32.esi]
|
|---|
| 440 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.rsi], ecx
|
|---|
| 441 | mov ecx, [eax + X86TSS32.edi]
|
|---|
| 442 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.rdi], ecx
|
|---|
| 443 | mov ecx, [eax + X86TSS32.esi]
|
|---|
| 444 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.rsi], ecx
|
|---|
| 445 | mov ecx, [eax + X86TSS32.eflags]
|
|---|
| 446 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.rflags], ecx
|
|---|
| 447 | mov ecx, [eax + X86TSS32.eip]
|
|---|
| 448 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.rip], ecx
|
|---|
| 449 | mov [ebp + 4], ecx ; For better call stacks.
|
|---|
| 450 | mov cx, [eax + X86TSS32.cs]
|
|---|
| 451 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.cs], cx
|
|---|
| 452 | mov cx, [eax + X86TSS32.ds]
|
|---|
| 453 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.ds], cx
|
|---|
| 454 | mov cx, [eax + X86TSS32.es]
|
|---|
| 455 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.es], cx
|
|---|
| 456 | mov cx, [eax + X86TSS32.fs]
|
|---|
| 457 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.fs], cx
|
|---|
| 458 | mov cx, [eax + X86TSS32.gs]
|
|---|
| 459 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.gs], cx
|
|---|
| 460 | mov cx, [eax + X86TSS32.ss]
|
|---|
| 461 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.ss], cx
|
|---|
| 462 | mov cx, [eax + X86TSS32.selLdt] ; Note! This isn't necessarily the ldtr at the time of the fault.
|
|---|
| 463 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.ldtr], cx
|
|---|
| 464 | mov cx, [eax + X86TSS32.cr3] ; Note! This isn't necessarily the cr3 at the time of the fault.
|
|---|
| 465 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.cr3], ecx
|
|---|
| 466 |
|
|---|
| 467 | ;
|
|---|
| 468 | ; Set CPL; copy and update mode.
|
|---|
| 469 | ;
|
|---|
| 470 | mov cl, [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.ss]
|
|---|
| 471 | and cl, 3
|
|---|
| 472 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.bCpl], cl
|
|---|
| 473 |
|
|---|
| 474 | mov cl, [BS3_DATA16_WRT(g_bBs3CurrentMode)]
|
|---|
| 475 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.bMode], cl
|
|---|
| 476 | and cl, ~BS3_MODE_CODE_MASK
|
|---|
| 477 | or cl, BS3_MODE_CODE_32
|
|---|
| 478 | mov [BS3_DATA16_WRT(g_bBs3CurrentMode)], cl
|
|---|
| 479 |
|
|---|
| 480 | ;
|
|---|
| 481 | ; Control registers.
|
|---|
| 482 | ;
|
|---|
| 483 | mov ecx, cr0
|
|---|
| 484 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.cr0], ecx
|
|---|
| 485 | mov ecx, cr2
|
|---|
| 486 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.cr2], ecx
|
|---|
| 487 | mov ecx, cr4
|
|---|
| 488 | mov [esp + BS3TRAPFRAME.Ctx + BS3REGCTX.cr4], ecx
|
|---|
| 489 |
|
|---|
| 490 | ;
|
|---|
| 491 | ; Join code paths with the generic handler code.
|
|---|
| 492 | ;
|
|---|
| 493 | jmp bs3Trap32GenericCommon.clear_and_dispatch_to_handler
|
|---|
| 494 | BS3_PROC_END Bs3Trap32DoubleFaultHandler
|
|---|
| 495 |
|
|---|
