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Diffstat (limited to 'include/VBox/SUPR0StackWrapper.mac')
| -rw-r--r-- | include/VBox/SUPR0StackWrapper.mac | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/include/VBox/SUPR0StackWrapper.mac b/include/VBox/SUPR0StackWrapper.mac new file mode 100644 index 00000000..152da635 --- /dev/null +++ b/include/VBox/SUPR0StackWrapper.mac @@ -0,0 +1,180 @@ +; $Id: SUPR0StackWrapper.mac $ +;; @file +; SUP - Support Library, ring-0 stack switching wrappers. +; + +; +; Copyright (C) 2006-2022 Oracle and/or its affiliates. +; +; This file is part of VirtualBox base platform packages, as +; available from https://www.virtualbox.org. +; +; This program is free software; you can redistribute it and/or +; modify it under the terms of the GNU General Public License +; as published by the Free Software Foundation, in version 3 of the +; License. +; +; This program is distributed in the hope that it will be useful, but +; WITHOUT ANY WARRANTY; without even the implied warranty of +; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +; General Public License for more details. +; +; You should have received a copy of the GNU General Public License +; along with this program; if not, see <https://www.gnu.org/licenses>. +; +; The contents of this file may alternatively be used under the terms +; of the Common Development and Distribution License Version 1.0 +; (CDDL), a copy of it is provided in the "COPYING.CDDL" file included +; in the VirtualBox distribution, in which case the provisions of the +; CDDL are applicable instead of those of the GPL. +; +; You may elect to license modified versions of this file under the +; terms and conditions of either the GPL or the CDDL or both. +; +; SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0 +; + +%ifndef ___VBox_SUPR0StackWrapper_mac +%define ___VBox_SUPR0StackWrapper_mac + +%include "VBox/asmdefs.mac" + +;; VBox's own Stack +%define SUPR0STACKINFO_MAGIC0 0786f4256h ; VBox +%define SUPR0STACKINFO_MAGIC1 06f207327h ; 's o +%define SUPR0STACKINFO_MAGIC2 053206e77h ; wn S +%define SUPR0STACKINFO_MAGIC3 06b636174h ; tack + +;; +; Stack info located before the start of the stack, at the top of the page. +; +struc SUPR0STACKINFO + .magic0 resd 1 + .magic1 resd 1 + .magic2 resd 1 + .magic3 resd 1 + .pResumeKernelStack resq 1 + .pSelf resq 1 +endstruc + +;; +; Number of parameters in GPRs and the spill area size. +%ifdef RT_ARCH_AMD64 + %ifdef ASM_CALL64_MSC + %define SUPR0_GRP_PARAMS 4 + %define SUPR0_SPILL_AREA 4 + %else + %define SUPR0_GRP_PARAMS 6 + %define SUPR0_SPILL_AREA 0 + %endif +%else + %define SUPR0_GRP_PARAMS 0 + %define SUPR0_SPILL_AREA 0 +%endif + +;; +; Generic stack switching wrapper. +; +; @param %1 The name +; @param %2 Number of arguments. +; +%macro SUPR0StackWrapperGeneric 2 +BEGINCODE +extern NAME(StkBack_ %+ %1) + +BEGINPROC %1 +%ifdef RT_ARCH_AMD64 ; Only for amd64 for now. + ; + ; Check for the stack info. + ; + mov rax, rsp + or rax, 0fffh + sub rax, SUPR0STACKINFO_size - 1 + + ; Check for the magic. + cmp dword [rax + SUPR0STACKINFO.magic0], SUPR0STACKINFO_MAGIC0 + jne .regular + cmp dword [rax + SUPR0STACKINFO.magic1], SUPR0STACKINFO_MAGIC1 + jne .regular + cmp dword [rax + SUPR0STACKINFO.magic2], SUPR0STACKINFO_MAGIC2 + jne .regular + cmp dword [rax + SUPR0STACKINFO.magic3], SUPR0STACKINFO_MAGIC3 + jne .regular + + ; Verify the self pointer. + cmp [rax + SUPR0STACKINFO.pSelf], rax + jne .regular + + ; + ; Perform a stack switch. We set up a RBP frame on the old stack so we + ; can use leave to restore the incoming stack upon return. + ; + push rbp + mov rbp, rsp + + ; The actual switch. + mov r10, 0ffffffffffffffe0h ; shuts up warning on 'and rsp, 0ffffffffffffffe0h' + and r10, [rax + SUPR0STACKINFO.pResumeKernelStack] + mov rsp, r10 + + ; + ; Copy over stack arguments. + ; + ; Note! We always copy 2-3 extra arguments (%2 + 2) just in case someone got + ; the argument count wrong. + ; +%if (%2 + 2) > SUPR0_GRP_PARAMS + 18 + %error too many parameters + %fatal too many parameters +%endif +%if (%2 + 2) > SUPR0_GRP_PARAMS + 16 + push qword [rbp + 98h] + push qword [rbp + 90h] +%endif +%if (%2 + 2) > SUPR0_GRP_PARAMS + 14 + push qword [rbp + 88h] + push qword [rbp + 80h] +%endif +%if (%2 + 2) > SUPR0_GRP_PARAMS + 12 + push qword [rbp + 78h] + push qword [rbp + 70h] +%endif +%if (%2 + 2) > SUPR0_GRP_PARAMS + 10 + push qword [rbp + 68h] + push qword [rbp + 60h] +%endif +%if (%2 + 2) > SUPR0_GRP_PARAMS + 8 + push qword [rbp + 58h] + push qword [rbp + 50h] +%endif +%if (%2 + 2) > SUPR0_GRP_PARAMS + 6 + push qword [rbp + 48h] + push qword [rbp + 40h] +%endif +%if (%2 + 2) > SUPR0_GRP_PARAMS + 4 + push qword [rbp + 38h] + push qword [rbp + 30h] +%endif +%if ((%2 + 2) > SUPR0_GRP_PARAMS + 2) || (SUPR0_SPILL_AREA > 2) + push qword [rbp + 28h] + push qword [rbp + 20h] +%endif +%if ((%2 + 2) > SUPR0_GRP_PARAMS) || (SUPR0_SPILL_AREA > 0) + push qword [rbp + 18h] + push qword [rbp + 10h] +%endif + + call NAME(StkBack_ %+ %1) + + leave + ret + +.regular: +%endif ; RT_ARCH_AMD64 + jmp NAME(StkBack_ %+ %1) +ENDPROC %1 +%endmacro + + +%endif + |