VirtualBox

source: vbox/trunk/include/VBox/SUPR0StackWrapper.mac@ 103224

Last change on this file since 103224 was 98103, checked in by vboxsync, 21 months ago

Copyright year updates by scm.

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1; $Id: SUPR0StackWrapper.mac 98103 2023-01-17 14:15:46Z vboxsync $
2;; @file
3; SUP - Support Library, ring-0 stack switching wrappers.
4;
5
6;
7; Copyright (C) 2006-2023 Oracle and/or its affiliates.
8;
9; This file is part of VirtualBox base platform packages, as
10; available from https://www.virtualbox.org.
11;
12; This program is free software; you can redistribute it and/or
13; modify it under the terms of the GNU General Public License
14; as published by the Free Software Foundation, in version 3 of the
15; License.
16;
17; This program is distributed in the hope that it will be useful, but
18; WITHOUT ANY WARRANTY; without even the implied warranty of
19; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20; General Public License for more details.
21;
22; You should have received a copy of the GNU General Public License
23; along with this program; if not, see <https://www.gnu.org/licenses>.
24;
25; The contents of this file may alternatively be used under the terms
26; of the Common Development and Distribution License Version 1.0
27; (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
28; in the VirtualBox distribution, in which case the provisions of the
29; CDDL are applicable instead of those of the GPL.
30;
31; You may elect to license modified versions of this file under the
32; terms and conditions of either the GPL or the CDDL or both.
33;
34; SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
35;
36
37%ifndef ___VBox_SUPR0StackWrapper_mac
38%define ___VBox_SUPR0StackWrapper_mac
39
40%include "VBox/asmdefs.mac"
41
42;; VBox's own Stack
43%define SUPR0STACKINFO_MAGIC0 0786f4256h ; VBox
44%define SUPR0STACKINFO_MAGIC1 06f207327h ; 's o
45%define SUPR0STACKINFO_MAGIC2 053206e77h ; wn S
46%define SUPR0STACKINFO_MAGIC3 06b636174h ; tack
47
48;;
49; Stack info located before the start of the stack, at the top of the page.
50;
51struc SUPR0STACKINFO
52 .magic0 resd 1
53 .magic1 resd 1
54 .magic2 resd 1
55 .magic3 resd 1
56 .pResumeKernelStack resq 1
57 .pSelf resq 1
58endstruc
59
60;;
61; Number of parameters in GPRs and the spill area size.
62%ifdef RT_ARCH_AMD64
63 %ifdef ASM_CALL64_MSC
64 %define SUPR0_GRP_PARAMS 4
65 %define SUPR0_SPILL_AREA 4
66 %else
67 %define SUPR0_GRP_PARAMS 6
68 %define SUPR0_SPILL_AREA 0
69 %endif
70%else
71 %define SUPR0_GRP_PARAMS 0
72 %define SUPR0_SPILL_AREA 0
73%endif
74
75;;
76; Generic stack switching wrapper.
77;
78; @param %1 The name
79; @param %2 Number of arguments.
80;
81%macro SUPR0StackWrapperGeneric 2
82BEGINCODE
83extern NAME(StkBack_ %+ %1)
84
85BEGINPROC %1
86%ifdef RT_ARCH_AMD64 ; Only for amd64 for now.
87 ;
88 ; Check for the stack info.
89 ;
90 mov rax, rsp
91 or rax, 0fffh
92 sub rax, SUPR0STACKINFO_size - 1
93
94 ; Check for the magic.
95 cmp dword [rax + SUPR0STACKINFO.magic0], SUPR0STACKINFO_MAGIC0
96 jne .regular
97 cmp dword [rax + SUPR0STACKINFO.magic1], SUPR0STACKINFO_MAGIC1
98 jne .regular
99 cmp dword [rax + SUPR0STACKINFO.magic2], SUPR0STACKINFO_MAGIC2
100 jne .regular
101 cmp dword [rax + SUPR0STACKINFO.magic3], SUPR0STACKINFO_MAGIC3
102 jne .regular
103
104 ; Verify the self pointer.
105 cmp [rax + SUPR0STACKINFO.pSelf], rax
106 jne .regular
107
108 ;
109 ; Perform a stack switch. We set up a RBP frame on the old stack so we
110 ; can use leave to restore the incoming stack upon return.
111 ;
112 push rbp
113 mov rbp, rsp
114
115 ; The actual switch.
116 mov r10, 0ffffffffffffffe0h ; shuts up warning on 'and rsp, 0ffffffffffffffe0h'
117 and r10, [rax + SUPR0STACKINFO.pResumeKernelStack]
118 mov rsp, r10
119
120 ;
121 ; Copy over stack arguments.
122 ;
123 ; Note! We always copy 2-3 extra arguments (%2 + 2) just in case someone got
124 ; the argument count wrong.
125 ;
126%if (%2 + 2) > SUPR0_GRP_PARAMS + 18
127 %error too many parameters
128 %fatal too many parameters
129%endif
130%if (%2 + 2) > SUPR0_GRP_PARAMS + 16
131 push qword [rbp + 98h]
132 push qword [rbp + 90h]
133%endif
134%if (%2 + 2) > SUPR0_GRP_PARAMS + 14
135 push qword [rbp + 88h]
136 push qword [rbp + 80h]
137%endif
138%if (%2 + 2) > SUPR0_GRP_PARAMS + 12
139 push qword [rbp + 78h]
140 push qword [rbp + 70h]
141%endif
142%if (%2 + 2) > SUPR0_GRP_PARAMS + 10
143 push qword [rbp + 68h]
144 push qword [rbp + 60h]
145%endif
146%if (%2 + 2) > SUPR0_GRP_PARAMS + 8
147 push qword [rbp + 58h]
148 push qword [rbp + 50h]
149%endif
150%if (%2 + 2) > SUPR0_GRP_PARAMS + 6
151 push qword [rbp + 48h]
152 push qword [rbp + 40h]
153%endif
154%if (%2 + 2) > SUPR0_GRP_PARAMS + 4
155 push qword [rbp + 38h]
156 push qword [rbp + 30h]
157%endif
158%if ((%2 + 2) > SUPR0_GRP_PARAMS + 2) || (SUPR0_SPILL_AREA > 2)
159 push qword [rbp + 28h]
160 push qword [rbp + 20h]
161%endif
162%if ((%2 + 2) > SUPR0_GRP_PARAMS) || (SUPR0_SPILL_AREA > 0)
163 push qword [rbp + 18h]
164 push qword [rbp + 10h]
165%endif
166
167 call NAME(StkBack_ %+ %1)
168
169 leave
170 ret
171
172.regular:
173%endif ; RT_ARCH_AMD64
174 jmp NAME(StkBack_ %+ %1)
175ENDPROC %1
176%endmacro
177
178
179%endif
180
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