| 1 | ; $Id: guard-vcc.asm 95916 2022-07-28 14:29:03Z 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 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.alldomusa.eu.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 | ;*********************************************************************************************************************************
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| 30 | ;* Header Files *
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| 31 | ;*********************************************************************************************************************************
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| 32 | %include "iprt/asmdefs.mac"
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| 33 | %include "iprt/x86.mac"
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| 34 |
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| 35 |
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| 36 |
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| 37 | ;*********************************************************************************************************************************
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| 38 | ;* Global Variables *
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| 39 | ;*********************************************************************************************************************************
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| 40 |
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| 41 | ;
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| 42 | ; Points to a NOP icall checker by default.
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| 43 | ; The loader will replace this when we start advertising it in the load config.
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| 44 | ;
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| 45 | section .0000cfg rdata align=8
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| 46 |
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| 47 | GLOBALNAME __guard_check_icall_fptr
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| 48 | RTCCPTR_DEF NAME(__guard_check_icall_nop)
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| 49 |
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| 50 | %ifdef RT_ARCH_AMD64
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| 51 | GLOBALNAME __guard_dispatch_icall_fptr
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| 52 | RTCCPTR_DEF __guard_dispatch_icall_nop
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| 53 |
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| 54 | ; xfg stuff (haven't seen it generated or used yet).
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| 55 | GLOBALNAME __guard_xfg_check_icall_fptr
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| 56 | RTCCPTR_DEF __guard_check_icall_nop
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| 57 |
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| 58 | GLOBALNAME __guard_xfg_dispatch_icall_fptr
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| 59 | RTCCPTR_DEF __guard_xfg_dispatch_icall_nop
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| 60 |
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| 61 | GLOBALNAME __guard_xfg_table_dispatch_icall_fptr
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| 62 | RTCCPTR_DEF __guard_xfg_dispatch_icall_nop
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| 63 |
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| 64 | %endif
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| 65 |
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| 66 |
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| 67 | BEGINCODE
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| 68 | ;;
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| 69 | ; Check that doesn't do anything.
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| 70 | ;
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| 71 | ; This is for older windows versions which doesn't support call flow guard stuff.
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| 72 | ;
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| 73 | BEGINPROC __guard_check_icall_nop
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| 74 | ret
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| 75 | ENDPROC __guard_check_icall_nop
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| 76 |
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| 77 | %ifdef RT_ARCH_AMD64
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| 78 | ;;
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| 79 | ; Target function in RAX
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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_dispatch_icall_nop
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| 84 | jmp rax
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| 85 | ENDPROC __guard_dispatch_icall_nop
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| 86 | %endif
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| 87 |
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| 88 | %ifdef RT_ARCH_AMD64
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| 89 | ;;
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| 90 | ; Target function in RAX
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| 91 | ;
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| 92 | ; This is for windows versions which doesn't support extended call flow guard stuff.
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| 93 | ;
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| 94 | BEGINPROC __guard_xfg_dispatch_icall_nop
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| 95 | jmp [__guard_dispatch_icall_nop wrt RIP]
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| 96 | ENDPROC __guard_xfg_dispatch_icall_nop
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| 97 | %endif
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| 98 |
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