[91779] | 1 | ; $Id: SUPR0StackWrapper.mac 98103 2023-01-17 14:15:46Z 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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[98103] | 7 | ; Copyright (C) 2006-2023 Oracle and/or its affiliates.
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[91779] | 8 | ;
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[96407] | 9 | ; This file is part of VirtualBox base platform packages, as
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| 10 | ; available from https://www.virtualbox.org.
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[91779] | 11 | ;
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[96407] | 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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[91779] | 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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[96407] | 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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[91779] | 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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[96407] | 34 | ; SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
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| 35 | ;
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[91779] | 36 |
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| 37 | %ifndef ___VBox_SUPR0StackWrapper_mac
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| 38 | %define ___VBox_SUPR0StackWrapper_mac
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| 39 |
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| 40 | %include "VBox/asmdefs.mac"
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| 41 |
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| 42 | ;; VBox's own Stack
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| 43 | %define SUPR0STACKINFO_MAGIC0 0786f4256h ; VBox
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| 44 | %define SUPR0STACKINFO_MAGIC1 06f207327h ; 's o
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| 45 | %define SUPR0STACKINFO_MAGIC2 053206e77h ; wn S
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| 46 | %define SUPR0STACKINFO_MAGIC3 06b636174h ; tack
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| 47 |
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| 48 | ;;
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| 49 | ; Stack info located before the start of the stack, at the top of the page.
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| 50 | ;
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| 51 | struc SUPR0STACKINFO
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| 52 | .magic0 resd 1
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| 53 | .magic1 resd 1
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| 54 | .magic2 resd 1
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| 55 | .magic3 resd 1
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| 56 | .pResumeKernelStack resq 1
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| 57 | .pSelf resq 1
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| 58 | endstruc
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| 59 |
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| 60 | ;;
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[91806] | 61 | ; Number of parameters in GPRs and the spill area size.
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| 62 | %ifdef RT_ARCH_AMD64
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| 63 | %ifdef ASM_CALL64_MSC
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| 64 | %define SUPR0_GRP_PARAMS 4
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| 65 | %define SUPR0_SPILL_AREA 4
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| 66 | %else
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| 67 | %define SUPR0_GRP_PARAMS 6
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| 68 | %define SUPR0_SPILL_AREA 0
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| 69 | %endif
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| 70 | %else
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| 71 | %define SUPR0_GRP_PARAMS 0
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| 72 | %define SUPR0_SPILL_AREA 0
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| 73 | %endif
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| 74 |
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| 75 | ;;
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[91779] | 76 | ; Generic stack switching wrapper.
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| 77 | ;
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[91806] | 78 | ; @param %1 The name
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| 79 | ; @param %2 Number of arguments.
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[91779] | 80 | ;
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[91806] | 81 | %macro SUPR0StackWrapperGeneric 2
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[91779] | 82 | BEGINCODE
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| 83 | extern NAME(StkBack_ %+ %1)
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| 84 |
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| 85 | BEGINPROC %1
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[91784] | 86 | %ifdef RT_ARCH_AMD64 ; Only for amd64 for now.
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[91779] | 87 | ;
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| 88 | ; Check for the stack info.
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| 89 | ;
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| 90 | mov rax, rsp
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| 91 | or rax, 0fffh
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| 92 | sub rax, SUPR0STACKINFO_size - 1
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| 93 |
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| 94 | ; Check for the magic.
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| 95 | cmp dword [rax + SUPR0STACKINFO.magic0], SUPR0STACKINFO_MAGIC0
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| 96 | jne .regular
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| 97 | cmp dword [rax + SUPR0STACKINFO.magic1], SUPR0STACKINFO_MAGIC1
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| 98 | jne .regular
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| 99 | cmp dword [rax + SUPR0STACKINFO.magic2], SUPR0STACKINFO_MAGIC2
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| 100 | jne .regular
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| 101 | cmp dword [rax + SUPR0STACKINFO.magic3], SUPR0STACKINFO_MAGIC3
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| 102 | jne .regular
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| 103 |
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| 104 | ; Verify the self pointer.
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| 105 | cmp [rax + SUPR0STACKINFO.pSelf], rax
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| 106 | jne .regular
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| 107 |
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| 108 | ;
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| 109 | ; Perform a stack switch. We set up a RBP frame on the old stack so we
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| 110 | ; can use leave to restore the incoming stack upon return.
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| 111 | ;
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| 112 | push rbp
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| 113 | mov rbp, rsp
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| 114 |
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| 115 | ; The actual switch.
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| 116 | mov r10, 0ffffffffffffffe0h ; shuts up warning on 'and rsp, 0ffffffffffffffe0h'
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| 117 | and r10, [rax + SUPR0STACKINFO.pResumeKernelStack]
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| 118 | mov rsp, r10
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| 119 |
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| 120 | ;
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[91806] | 121 | ; Copy over stack arguments.
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[91779] | 122 | ;
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[91806] | 123 | ; Note! We always copy 2-3 extra arguments (%2 + 2) just in case someone got
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| 124 | ; the argument count wrong.
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[91779] | 125 | ;
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[91806] | 126 | %if (%2 + 2) > SUPR0_GRP_PARAMS + 18
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| 127 | %error too many parameters
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| 128 | %fatal too many parameters
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| 129 | %endif
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| 130 | %if (%2 + 2) > SUPR0_GRP_PARAMS + 16
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| 131 | push qword [rbp + 98h]
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| 132 | push qword [rbp + 90h]
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| 133 | %endif
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| 134 | %if (%2 + 2) > SUPR0_GRP_PARAMS + 14
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[91779] | 135 | push qword [rbp + 88h]
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| 136 | push qword [rbp + 80h]
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[91806] | 137 | %endif
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| 138 | %if (%2 + 2) > SUPR0_GRP_PARAMS + 12
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[91779] | 139 | push qword [rbp + 78h]
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| 140 | push qword [rbp + 70h]
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[91806] | 141 | %endif
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| 142 | %if (%2 + 2) > SUPR0_GRP_PARAMS + 10
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[91779] | 143 | push qword [rbp + 68h]
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| 144 | push qword [rbp + 60h]
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[91806] | 145 | %endif
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| 146 | %if (%2 + 2) > SUPR0_GRP_PARAMS + 8
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[91779] | 147 | push qword [rbp + 58h]
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| 148 | push qword [rbp + 50h]
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[91806] | 149 | %endif
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| 150 | %if (%2 + 2) > SUPR0_GRP_PARAMS + 6
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[91779] | 151 | push qword [rbp + 48h]
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| 152 | push qword [rbp + 40h]
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[91806] | 153 | %endif
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| 154 | %if (%2 + 2) > SUPR0_GRP_PARAMS + 4
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[91779] | 155 | push qword [rbp + 38h]
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| 156 | push qword [rbp + 30h]
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[91806] | 157 | %endif
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| 158 | %if ((%2 + 2) > SUPR0_GRP_PARAMS + 2) || (SUPR0_SPILL_AREA > 2)
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[91779] | 159 | push qword [rbp + 28h]
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| 160 | push qword [rbp + 20h]
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[91806] | 161 | %endif
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| 162 | %if ((%2 + 2) > SUPR0_GRP_PARAMS) || (SUPR0_SPILL_AREA > 0)
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[91779] | 163 | push qword [rbp + 18h]
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| 164 | push qword [rbp + 10h]
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[91806] | 165 | %endif
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[91779] | 166 |
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| 167 | call NAME(StkBack_ %+ %1)
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| 168 |
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| 169 | leave
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| 170 | ret
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| 171 |
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| 172 | .regular:
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[91784] | 173 | %endif ; RT_ARCH_AMD64
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[91779] | 174 | jmp NAME(StkBack_ %+ %1)
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| 175 | ENDPROC %1
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| 176 | %endmacro
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| 177 |
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| 178 |
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| 179 | %endif
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| 180 |
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