| 1 | ; $Id: SUPR0StackWrapper.mac 91780 2021-10-17 11:13:41Z vboxsync $
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| 2 | ;; @file
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| 3 | ; SUP - Support Library, ring-0 stack switching wrappers.
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| 4 | ;
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| 5 |
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| 6 | ;
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| 7 | ; Copyright (C) 2006-2021 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 | %ifndef ___VBox_SUPR0StackWrapper_mac
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| 28 | %define ___VBox_SUPR0StackWrapper_mac
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| 29 |
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| 30 | %include "VBox/asmdefs.mac"
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| 31 |
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| 32 | ;; VBox's own Stack
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| 33 | %define SUPR0STACKINFO_MAGIC0 0786f4256h ; VBox
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| 34 | %define SUPR0STACKINFO_MAGIC1 06f207327h ; 's o
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| 35 | %define SUPR0STACKINFO_MAGIC2 053206e77h ; wn S
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| 36 | %define SUPR0STACKINFO_MAGIC3 06b636174h ; tack
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| 37 |
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| 38 | ;;
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| 39 | ; Stack info located before the start of the stack, at the top of the page.
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| 40 | ;
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| 41 | struc SUPR0STACKINFO
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| 42 | .magic0 resd 1
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| 43 | .magic1 resd 1
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| 44 | .magic2 resd 1
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| 45 | .magic3 resd 1
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| 46 | .pResumeKernelStack resq 1
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| 47 | .pSelf resq 1
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| 48 | endstruc
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| 49 |
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| 50 | ;;
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| 51 | ; Generic stack switching wrapper.
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| 52 | ;
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| 53 | ; This supports up to 16 arguments on the stack in addition to the 6 GPR
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| 54 | ; and 6 FPR arguments, which should be enough for most functions, even
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| 55 | ; RTLogCreateExV.
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| 56 | ;
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| 57 | %macro SUPR0StackWrapperGeneric 1
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| 58 | BEGINCODE
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| 59 | extern NAME(StkBack_ %+ %1)
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| 60 |
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| 61 | BEGINPROC %1
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| 62 | ;
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| 63 | ; Check for the stack info.
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| 64 | ;
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| 65 | mov rax, rsp
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| 66 | or rax, 0fffh
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| 67 | sub rax, SUPR0STACKINFO_size - 1
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| 68 |
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| 69 | ; Check for the magic.
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| 70 | cmp dword [rax + SUPR0STACKINFO.magic0], SUPR0STACKINFO_MAGIC0
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| 71 | jne .regular
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| 72 | cmp dword [rax + SUPR0STACKINFO.magic1], SUPR0STACKINFO_MAGIC1
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| 73 | jne .regular
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| 74 | cmp dword [rax + SUPR0STACKINFO.magic2], SUPR0STACKINFO_MAGIC2
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| 75 | jne .regular
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| 76 | cmp dword [rax + SUPR0STACKINFO.magic3], SUPR0STACKINFO_MAGIC3
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| 77 | jne .regular
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| 78 |
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| 79 | ; Verify the self pointer.
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| 80 | cmp [rax + SUPR0STACKINFO.pSelf], rax
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| 81 | jne .regular
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| 82 |
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| 83 | ;
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| 84 | ; Perform a stack switch. We set up a RBP frame on the old stack so we
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| 85 | ; can use leave to restore the incoming stack upon return.
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| 86 | ;
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| 87 | push rbp
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| 88 | mov rbp, rsp
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| 89 |
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| 90 | ; The actual switch.
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| 91 | mov r10, 0ffffffffffffffe0h ; shuts up warning on 'and rsp, 0ffffffffffffffe0h'
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| 92 | and r10, [rax + SUPR0STACKINFO.pResumeKernelStack]
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| 93 | mov rsp, r10
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| 94 |
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| 95 | ;
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| 96 | ; Copy over 16 stack arguments (128 bytes).
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| 97 | ;
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| 98 | ; We kind of ASSUME no function takes more arguments than that, and we ASSUME
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| 99 | ; the code setting up the info makes sure rbp+88h won't underflow the stack.
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| 100 | ;
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| 101 |
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| 102 | push qword [rbp + 88h]
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| 103 | push qword [rbp + 80h]
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| 104 | push qword [rbp + 78h]
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| 105 | push qword [rbp + 70h]
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| 106 | push qword [rbp + 68h]
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| 107 | push qword [rbp + 60h]
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| 108 | push qword [rbp + 58h]
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| 109 | push qword [rbp + 50h]
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| 110 | push qword [rbp + 48h]
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| 111 | push qword [rbp + 40h]
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| 112 | push qword [rbp + 38h]
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| 113 | push qword [rbp + 30h]
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| 114 | push qword [rbp + 28h]
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| 115 | push qword [rbp + 20h]
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| 116 | push qword [rbp + 18h]
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| 117 | push qword [rbp + 10h]
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| 118 |
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| 119 | call NAME(StkBack_ %+ %1)
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| 120 |
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| 121 | leave
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| 122 | ret
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| 123 |
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| 124 | .regular:
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| 125 | jmp NAME(StkBack_ %+ %1)
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| 126 | ENDPROC %1
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| 127 | %endmacro
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| 128 |
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| 129 |
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| 130 | %endif
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| 131 |
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