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|
; $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
|
