| 1 | ; $Id: guard-vcc.asm 98103 2023-01-17 14:15:46Z vboxsync $
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| 2 | ;; @file
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| 3 | ; IPRT - Control Flow Guard related Visual C++ support routines.
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| 4 | ;
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| 5 |
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| 6 | ;
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| 7 | ; Copyright (C) 2022-2023 Oracle and/or its affiliates.
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| 8 | ;
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| 9 | ; This file is part of VirtualBox base platform packages, as
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| 10 | ; available from https://www.alldomusa.eu.org.
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| 11 | ;
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| 12 | ; This program is free software; you can redistribute it and/or
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| 13 | ; modify it under the terms of the GNU General Public License
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| 14 | ; as published by the Free Software Foundation, in version 3 of the
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| 15 | ; License.
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| 16 | ;
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| 17 | ; This program is distributed in the hope that it will be useful, but
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| 18 | ; WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 20 | ; General Public License for more details.
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| 21 | ;
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| 22 | ; You should have received a copy of the GNU General Public License
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| 23 | ; along with this program; if not, see <https://www.gnu.org/licenses>.
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| 24 | ;
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| 25 | ; The contents of this file may alternatively be used under the terms
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| 26 | ; of the Common Development and Distribution License Version 1.0
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| 27 | ; (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
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| 28 | ; in the VirtualBox distribution, in which case the provisions of the
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| 29 | ; CDDL are applicable instead of those of the GPL.
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| 30 | ;
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| 31 | ; You may elect to license modified versions of this file under the
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| 32 | ; terms and conditions of either the GPL or the CDDL or both.
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| 33 | ;
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| 34 | ; SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
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| 35 | ;
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| 36 |
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| 37 |
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| 38 |
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| 39 | ;*********************************************************************************************************************************
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| 40 | ;* Header Files *
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| 41 | ;*********************************************************************************************************************************
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| 42 | %include "iprt/asmdefs.mac"
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| 43 | %include "iprt/x86.mac"
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| 44 |
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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 |
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| 51 | ;
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| 52 | ; Points to a NOP icall checker by default.
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| 53 | ; The loader will replace this when we start advertising it in the load config.
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| 54 | ;
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| 55 | section .0000cfg rdata align=8
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| 56 |
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| 57 | GLOBALNAME __guard_check_icall_fptr
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| 58 | RTCCPTR_DEF NAME(__guard_check_icall_nop)
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| 59 |
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| 60 | %ifdef RT_ARCH_AMD64
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| 61 | GLOBALNAME __guard_dispatch_icall_fptr
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| 62 | RTCCPTR_DEF __guard_dispatch_icall_nop
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| 63 |
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| 64 | ; xfg stuff (haven't seen it generated or used yet).
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| 65 | GLOBALNAME __guard_xfg_check_icall_fptr
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| 66 | RTCCPTR_DEF __guard_check_icall_nop
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| 67 |
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| 68 | GLOBALNAME __guard_xfg_dispatch_icall_fptr
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| 69 | RTCCPTR_DEF __guard_xfg_dispatch_icall_nop
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| 70 |
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| 71 | GLOBALNAME __guard_xfg_table_dispatch_icall_fptr
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| 72 | RTCCPTR_DEF __guard_xfg_dispatch_icall_nop
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| 73 |
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| 74 | %endif
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| 75 |
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| 76 |
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| 77 | BEGINCODE
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| 78 | ;;
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| 79 | ; Check that doesn't do anything.
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| 80 | ;
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| 81 | ; This is for older windows versions which doesn't support call flow guard stuff.
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| 82 | ;
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| 83 | BEGINPROC __guard_check_icall_nop
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| 84 | ret
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| 85 | ENDPROC __guard_check_icall_nop
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| 86 |
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| 87 | %ifdef RT_ARCH_AMD64
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| 88 | ;;
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| 89 | ; Target function in RAX
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| 90 | ;
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| 91 | ; This is for older windows versions which doesn't support call flow guard stuff.
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| 92 | ;
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| 93 | BEGINPROC __guard_dispatch_icall_nop
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| 94 | jmp rax
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| 95 | ENDPROC __guard_dispatch_icall_nop
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| 96 | %endif
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| 97 |
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| 98 | %ifdef RT_ARCH_AMD64
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| 99 | ;;
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| 100 | ; Target function in RAX
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| 101 | ;
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| 102 | ; This is for windows versions which doesn't support extended call flow guard stuff.
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| 103 | ;
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| 104 | BEGINPROC __guard_xfg_dispatch_icall_nop
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| 105 | jmp [__guard_dispatch_icall_nop wrt RIP]
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| 106 | ENDPROC __guard_xfg_dispatch_icall_nop
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| 107 | %endif
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| 108 |
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