| 1 | ; $Id: bs3-c64-Trap64Generic.asm 82968 2020-02-04 10:35:17Z vboxsync $
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| 2 | ;; @file
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| 3 | ; BS3Kit - Trap, 64-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) 2007-2020 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 | ;* 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_64BIT
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| 33 | %error "64-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 | BS3_EXTERN_DATA16 g_apfnBs3TrapHandlers_c64
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| 42 | TMPL_BEGIN_TEXT
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| 43 | BS3_EXTERN_CMN Bs3TrapDefaultHandler
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| 44 | BS3_EXTERN_CMN Bs3RegCtxRestore
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| 45 | TMPL_BEGIN_TEXT
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| 46 |
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| 47 |
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| 48 | ;*********************************************************************************************************************************
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| 49 | ;* Global Variables *
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| 50 | ;*********************************************************************************************************************************
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| 51 | BS3_BEGIN_DATA16
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| 52 | ;; Easy to access flat address of Bs3Trap64GenericEntries.
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| 53 | BS3_GLOBAL_DATA g_Bs3Trap64GenericEntriesFlatAddr, 4
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| 54 | dd Bs3Trap64GenericEntries wrt FLAT
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| 55 |
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| 56 |
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| 57 | TMPL_BEGIN_TEXT
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| 58 |
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| 59 | ;;
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| 60 | ; Generic entry points for IDT handlers, 8 byte spacing.
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| 61 | ;
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| 62 | BS3_PROC_BEGIN Bs3Trap64GenericEntries
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| 63 | %macro Bs3Trap64GenericEntry 1
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| 64 | db 06ah, i ; push imm8 - note that this is a signextended value.
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| 65 | jmp %1
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| 66 | ALIGNCODE(8)
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| 67 | %assign i i+1
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| 68 | %endmacro
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| 69 |
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| 70 | %assign i 0 ; start counter.
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| 71 | Bs3Trap64GenericEntry Bs3Trap64GenericTrapOrInt ; 0
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| 72 | Bs3Trap64GenericEntry Bs3Trap64GenericTrapOrInt ; 1
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| 73 | Bs3Trap64GenericEntry Bs3Trap64GenericTrapOrInt ; 2
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| 74 | Bs3Trap64GenericEntry Bs3Trap64GenericTrapOrInt ; 3
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| 75 | Bs3Trap64GenericEntry Bs3Trap64GenericTrapOrInt ; 4
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| 76 | Bs3Trap64GenericEntry Bs3Trap64GenericTrapOrInt ; 5
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| 77 | Bs3Trap64GenericEntry Bs3Trap64GenericTrapOrInt ; 6
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| 78 | Bs3Trap64GenericEntry Bs3Trap64GenericTrapOrInt ; 7
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| 79 | Bs3Trap64GenericEntry Bs3Trap64GenericTrapErrCode ; 8
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| 80 | Bs3Trap64GenericEntry Bs3Trap64GenericTrapOrInt ; 9
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| 81 | Bs3Trap64GenericEntry Bs3Trap64GenericTrapErrCode ; a
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| 82 | Bs3Trap64GenericEntry Bs3Trap64GenericTrapErrCode ; b
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| 83 | Bs3Trap64GenericEntry Bs3Trap64GenericTrapErrCode ; c
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| 84 | Bs3Trap64GenericEntry Bs3Trap64GenericTrapErrCode ; d
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| 85 | Bs3Trap64GenericEntry Bs3Trap64GenericTrapErrCode ; e
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| 86 | Bs3Trap64GenericEntry Bs3Trap64GenericTrapOrInt ; f (reserved)
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| 87 | Bs3Trap64GenericEntry Bs3Trap64GenericTrapOrInt ; 10
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| 88 | Bs3Trap64GenericEntry Bs3Trap64GenericTrapErrCode ; 11
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| 89 | Bs3Trap64GenericEntry Bs3Trap64GenericTrapOrInt ; 12
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| 90 | Bs3Trap64GenericEntry Bs3Trap64GenericTrapOrInt ; 13
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| 91 | Bs3Trap64GenericEntry Bs3Trap64GenericTrapOrInt ; 14
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| 92 | Bs3Trap64GenericEntry Bs3Trap64GenericTrapOrInt ; 15 (reserved)
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| 93 | Bs3Trap64GenericEntry Bs3Trap64GenericTrapOrInt ; 16 (reserved)
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| 94 | Bs3Trap64GenericEntry Bs3Trap64GenericTrapOrInt ; 17 (reserved)
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| 95 | Bs3Trap64GenericEntry Bs3Trap64GenericTrapOrInt ; 18 (reserved)
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| 96 | Bs3Trap64GenericEntry Bs3Trap64GenericTrapOrInt ; 19 (reserved)
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| 97 | Bs3Trap64GenericEntry Bs3Trap64GenericTrapOrInt ; 1a (reserved)
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| 98 | Bs3Trap64GenericEntry Bs3Trap64GenericTrapOrInt ; 1b (reserved)
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| 99 | Bs3Trap64GenericEntry Bs3Trap64GenericTrapOrInt ; 1c (reserved)
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| 100 | Bs3Trap64GenericEntry Bs3Trap64GenericTrapOrInt ; 1d (reserved)
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| 101 | Bs3Trap64GenericEntry Bs3Trap64GenericTrapErrCode ; 1e
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| 102 | Bs3Trap64GenericEntry Bs3Trap64GenericTrapOrInt ; 1f (reserved)
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| 103 | %rep 224
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| 104 | Bs3Trap64GenericEntry Bs3Trap64GenericTrapOrInt
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| 105 | %endrep
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| 106 | BS3_PROC_END Bs3Trap64GenericEntries
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| 107 |
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| 108 |
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| 109 |
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| 110 |
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| 111 | ;;
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| 112 | ; Trap or interrupt (no error code).
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| 113 | ;
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| 114 | BS3_PROC_BEGIN Bs3Trap64GenericTrapOrInt
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| 115 | push rbp ; 0
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| 116 | mov rbp, rsp
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| 117 | pushfq ; -08h
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| 118 | cld
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| 119 | push rdi
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| 120 |
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| 121 | ; Reserve space for the register and trap frame.
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| 122 | mov edi, (BS3TRAPFRAME_size + 15) / 16
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| 123 | .more_zeroed_space:
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| 124 | push qword 0
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| 125 | push qword 0
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| 126 | dec edi
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| 127 | jnz .more_zeroed_space
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| 128 | mov rdi, rsp ; rdi points to trapframe structure.
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| 129 |
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| 130 | ; Free up rax.
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| 131 | mov [edi + BS3TRAPFRAME.Ctx + BS3REGCTX.rax], rax
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| 132 |
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| 133 | ; Copy stuff from the stack over.
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| 134 | mov al, [rbp + 08h]
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| 135 | mov [rdi + BS3TRAPFRAME.bXcpt], al
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| 136 | mov rax, [rbp]
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| 137 | mov [rdi + BS3TRAPFRAME.Ctx + BS3REGCTX.rbp], rax
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| 138 | mov rax, [rbp - 08h]
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| 139 | mov [rdi + BS3TRAPFRAME.fHandlerRfl], rax
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| 140 | mov rax, [rbp - 10h]
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| 141 | mov [rdi + BS3TRAPFRAME.Ctx + BS3REGCTX.rdi], rax
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| 142 |
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| 143 | lea rbp, [rbp + 08h] ; iret - 8 (i.e. rbp frame chain location)
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| 144 | jmp Bs3Trap64GenericCommon
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| 145 | BS3_PROC_END Bs3Trap64GenericTrapOrInt
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| 146 |
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| 147 |
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| 148 | ;;
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| 149 | ; Trap with error code.
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| 150 | ;
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| 151 | BS3_PROC_BEGIN Bs3Trap64GenericTrapErrCode
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| 152 | push rbp ; 0
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| 153 | mov rbp, rsp
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| 154 | pushfq ; -08h
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| 155 | cld
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| 156 | push rdi
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| 157 |
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| 158 | ; Reserve space for the register and trap frame.
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| 159 | mov edi, (BS3TRAPFRAME_size + 15) / 16
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| 160 | .more_zeroed_space:
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| 161 | push qword 0
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| 162 | push qword 0
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| 163 | dec edi
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| 164 | jnz .more_zeroed_space
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| 165 | mov rdi, rsp ; rdi points to trapframe structure.
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| 166 |
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| 167 | ; Free up rax.
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| 168 | mov [edi + BS3TRAPFRAME.Ctx + BS3REGCTX.rax], rax
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| 169 |
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| 170 | ; Copy stuff from the stack over.
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| 171 | mov rax, [rbp + 10h]
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| 172 | mov [rdi + BS3TRAPFRAME.uErrCd], rax
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| 173 | mov al, [rbp + 08h]
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| 174 | mov [rdi + BS3TRAPFRAME.bXcpt], al
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| 175 | mov rax, [rbp]
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| 176 | mov [rdi + BS3TRAPFRAME.Ctx + BS3REGCTX.rbp], rax
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| 177 | mov rax, [rbp - 08h]
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| 178 | mov [rdi + BS3TRAPFRAME.fHandlerRfl], rax
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| 179 | mov rax, [rbp - 10h]
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| 180 | mov [rdi + BS3TRAPFRAME.Ctx + BS3REGCTX.rdi], rax
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| 181 |
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| 182 | lea rbp, [rbp + 10h] ; iret - 8 (i.e. rbp frame chain location)
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| 183 | jmp Bs3Trap64GenericCommon
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| 184 | BS3_PROC_END Bs3Trap64GenericTrapErrCode
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| 185 |
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| 186 |
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| 187 | ;;
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| 188 | ; Common context saving code and dispatching.
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| 189 | ;
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| 190 | ; @param rdi Pointer to the trap frame. The following members have been
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| 191 | ; filled in by the previous code:
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| 192 | ; - bXcpt
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| 193 | ; - uErrCd
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| 194 | ; - fHandlerRfl
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| 195 | ; - Ctx.rax
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| 196 | ; - Ctx.rbp
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| 197 | ; - Ctx.rdi
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| 198 | ;
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| 199 | ; @param rbp Pointer to the dword before the iret frame, i.e. where rbp
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| 200 | ; would be saved if this was a normal call.
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| 201 | ;
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| 202 | BS3_PROC_BEGIN Bs3Trap64GenericCommon
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| 203 | ;
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| 204 | ; Fake RBP frame.
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| 205 | ;
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| 206 | mov rax, [rdi + BS3TRAPFRAME.Ctx + BS3REGCTX.rbp]
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| 207 | mov [rbp], rax
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| 208 |
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| 209 | ;
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| 210 | ; Save the remaining GPRs and segment registers.
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| 211 | ;
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| 212 | mov [rdi + BS3TRAPFRAME.Ctx + BS3REGCTX.rcx], rcx
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| 213 | mov [rdi + BS3TRAPFRAME.Ctx + BS3REGCTX.rdx], rdx
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| 214 | mov [rdi + BS3TRAPFRAME.Ctx + BS3REGCTX.rbx], rbx
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| 215 | mov [rdi + BS3TRAPFRAME.Ctx + BS3REGCTX.rsi], rsi
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| 216 | mov [rdi + BS3TRAPFRAME.Ctx + BS3REGCTX.r8 ], r8
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| 217 | mov [rdi + BS3TRAPFRAME.Ctx + BS3REGCTX.r9 ], r9
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| 218 | mov [rdi + BS3TRAPFRAME.Ctx + BS3REGCTX.r10], r10
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| 219 | mov [rdi + BS3TRAPFRAME.Ctx + BS3REGCTX.r11], r11
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| 220 | mov [rdi + BS3TRAPFRAME.Ctx + BS3REGCTX.r12], r12
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| 221 | mov [rdi + BS3TRAPFRAME.Ctx + BS3REGCTX.r13], r13
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| 222 | mov [rdi + BS3TRAPFRAME.Ctx + BS3REGCTX.r14], r14
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| 223 | mov [rdi + BS3TRAPFRAME.Ctx + BS3REGCTX.r15], r15
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| 224 | mov [rdi + BS3TRAPFRAME.Ctx + BS3REGCTX.ds], ds
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| 225 | mov [rdi + BS3TRAPFRAME.Ctx + BS3REGCTX.es], es
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| 226 | mov [rdi + BS3TRAPFRAME.Ctx + BS3REGCTX.fs], fs
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| 227 | mov [rdi + BS3TRAPFRAME.Ctx + BS3REGCTX.gs], gs
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| 228 | lea rax, [rbp + 8h]
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| 229 | mov [rdi + BS3TRAPFRAME.uHandlerRsp], rax
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| 230 | mov [rdi + BS3TRAPFRAME.uHandlerSs], ss
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| 231 |
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| 232 | ;
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| 233 | ; Load 32-bit data selector for the DPL we're executing at into DS, ES and SS.
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| 234 | ; Save the handler CS value first.
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| 235 | ;
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| 236 | mov ax, cs
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| 237 | mov [rdi + BS3TRAPFRAME.uHandlerCs], ax
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| 238 | AssertCompile(BS3_SEL_RING_SHIFT == 8)
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| 239 | and al, 3
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| 240 | mov ah, al
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| 241 | add ax, BS3_SEL_R0_DS64
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| 242 | mov ds, ax
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| 243 | mov es, ax
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| 244 | mov ss, ax
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| 245 |
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| 246 | ;
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| 247 | ; Copy and update the mode.
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| 248 | ;
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| 249 | mov al, [BS3_DATA16_WRT(g_bBs3CurrentMode)]
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| 250 | mov [rdi + BS3TRAPFRAME.Ctx + BS3REGCTX.bMode], al
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| 251 | and al, ~BS3_MODE_CODE_MASK
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| 252 | or al, BS3_MODE_CODE_64
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| 253 | mov [BS3_DATA16_WRT(g_bBs3CurrentMode)], al
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| 254 |
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| 255 | ;
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| 256 | ; Copy iret info. Bless AMD for only doing one 64-bit iret frame layout.
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| 257 | ;
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| 258 | mov rcx, [rbp + 08]
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| 259 | mov [rdi + BS3TRAPFRAME.Ctx + BS3REGCTX.rip], rcx
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| 260 | mov cx, [rbp + 10h]
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| 261 | mov [rdi + BS3TRAPFRAME.Ctx + BS3REGCTX.cs], cx
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| 262 | and cl, 3
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| 263 | mov [rdi + BS3TRAPFRAME.Ctx + BS3REGCTX.bCpl], cl
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| 264 | mov rcx, [rbp + 18h]
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| 265 | mov [rdi + BS3TRAPFRAME.Ctx + BS3REGCTX.rflags], rcx
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| 266 | mov rcx, [rbp + 20h]
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| 267 | mov [rdi + BS3TRAPFRAME.Ctx + BS3REGCTX.rsp], rcx
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| 268 | mov cx, [rbp + 28h]
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| 269 | mov [rdi + BS3TRAPFRAME.Ctx + BS3REGCTX.ss], cx
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| 270 | mov byte [rdi + BS3TRAPFRAME.cbIretFrame], 5*8
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| 271 |
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| 272 | ;
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| 273 | ; Control registers.
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| 274 | ;
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| 275 | str ax
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| 276 | mov [rdi + BS3TRAPFRAME.Ctx + BS3REGCTX.tr], ax
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| 277 | sldt ax
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| 278 | mov [rdi + BS3TRAPFRAME.Ctx + BS3REGCTX.ldtr], ax
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| 279 |
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| 280 | mov ax, ss
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| 281 | test al, 3
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| 282 | jnz .skip_crX_because_cpl_not_0
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| 283 |
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| 284 | mov rax, cr0
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| 285 | mov [rdi + BS3TRAPFRAME.Ctx + BS3REGCTX.cr0], rax
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| 286 | mov rax, cr2
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| 287 | mov [rdi + BS3TRAPFRAME.Ctx + BS3REGCTX.cr2], rax
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| 288 | mov rax, cr3
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| 289 | mov [rdi + BS3TRAPFRAME.Ctx + BS3REGCTX.cr3], rax
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| 290 | mov rax, cr4
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| 291 | mov [rdi + BS3TRAPFRAME.Ctx + BS3REGCTX.cr4], rax
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| 292 | jmp .dispatch_to_handler
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| 293 |
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| 294 | .skip_crX_because_cpl_not_0:
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| 295 | or byte [rdi + BS3TRAPFRAME.Ctx + BS3REGCTX.fbFlags], \
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| 296 | BS3REG_CTX_F_NO_CR0_IS_MSW | BS3REG_CTX_F_NO_CR2_CR3 | BS3REG_CTX_F_NO_CR4
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| 297 | smsw [rdi + BS3TRAPFRAME.Ctx + BS3REGCTX.cr0]
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| 298 |
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| 299 | ;
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| 300 | ; Dispatch it to C code.
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| 301 | ;
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| 302 | .dispatch_to_handler: ; The double fault code joins us here.
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| 303 | movzx ebx, byte [rdi + BS3TRAPFRAME.bXcpt]
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| 304 | lea rax, [BS3_DATA16_WRT(_g_apfnBs3TrapHandlers_c64)]
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| 305 | mov rax, [rax + rbx * 8]
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| 306 | or rax, rax
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| 307 | jnz .call_handler
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| 308 | lea rax, [BS3_WRT_RIP(Bs3TrapDefaultHandler)]
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| 309 | .call_handler:
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| 310 | sub rsp, 20h
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| 311 | mov [rsp], rdi
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| 312 | mov rcx, rdi
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| 313 | call rax
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| 314 |
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| 315 | ;
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| 316 | ; Resume execution using trap frame.
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| 317 | ;
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| 318 | xor edx, edx ; fFlags
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| 319 | mov [rsp + 8], rdx
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| 320 | lea rcx, [rdi + BS3TRAPFRAME.Ctx] ; pCtx
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| 321 | mov [rsp], rcx
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| 322 | call Bs3RegCtxRestore
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| 323 | .panic:
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| 324 | hlt
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| 325 | jmp .panic
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| 326 | BS3_PROC_END Bs3Trap64GenericCommon
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| 327 |
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