VirtualBox

source: vbox/trunk/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-RegSetDrX.asm@ 82968

Last change on this file since 82968 was 82968, checked in by vboxsync, 5 years ago

Copyright year updates by scm.

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File size: 3.4 KB
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1; $Id: bs3-cmn-RegSetDrX.asm 82968 2020-02-04 10:35:17Z vboxsync $
2;; @file
3; BS3Kit - Bs3RegSetDrX
4;
5
6;
7; Copyright (C) 2007-2020 Oracle Corporation
8;
9; This file is part of VirtualBox Open Source Edition (OSE), as
10; available from http://www.virtualbox.org. This file is free software;
11; you can redistribute it and/or modify it under the terms of the GNU
12; General Public License (GPL) as published by the Free Software
13; Foundation, in version 2 as it comes in the "COPYING" file of the
14; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16;
17; The contents of this file may alternatively be used under the terms
18; of the Common Development and Distribution License Version 1.0
19; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20; VirtualBox OSE distribution, in which case the provisions of the
21; CDDL are applicable instead of those of the GPL.
22;
23; You may elect to license modified versions of this file under the
24; terms and conditions of either the GPL or the CDDL or both.
25;
26
27%include "bs3kit-template-header.mac"
28
29
30BS3_EXTERN_CMN Bs3Panic
31BS3_EXTERN_CMN Bs3Syscall
32%if TMPL_BITS == 16
33BS3_EXTERN_DATA16 g_bBs3CurrentMode
34%endif
35TMPL_BEGIN_TEXT
36
37;TONLY16 CPU 386
38
39;;
40; @cproto BS3_CMN_PROTO_STUB(void, Bs3RegSetDrX,(uint8_t iReg, RTCCUINTXREG uValue));
41;
42; @returns Register value.
43; @param iRegister The source register
44; @param uValue The new Value.
45
46; @remarks Does not require 20h of parameter scratch space in 64-bit mode.
47;
48; @uses No GPRs.
49;
50BS3_PROC_BEGIN_CMN Bs3RegSetDrX, BS3_PBC_HYBRID_SAFE
51 BS3_CALL_CONV_PROLOG 2
52 push xBP
53 mov xBP, xSP
54 push sSI
55 push xDX
56
57 mov sSI, [xBP + xCB + cbCurRetAddr + xCB]
58
59%if TMPL_BITS == 16
60 ; If V8086 mode we have to go thru a syscall.
61 test byte [BS3_DATA16_WRT(g_bBs3CurrentMode)], BS3_MODE_CODE_V86
62 jnz .via_system_call
63 cmp byte [BS3_DATA16_WRT(g_bBs3CurrentMode)], BS3_MODE_RM
64 je .direct_access
65%endif
66 ; If not in ring-0, we have to make a system call.
67 mov dx, ss
68 and dx, X86_SEL_RPL
69 jnz .via_system_call
70
71.direct_access:
72 ; Switch (iRegister)
73 mov dl, [xBP + xCB + cbCurRetAddr]
74 cmp dl, 6
75 jz .set_dr6
76 cmp dl, 7
77 jz .set_dr7
78 cmp dl, 0
79 jz .set_dr0
80 cmp dl, 1
81 jz .set_dr1
82 cmp dl, 2
83 jz .set_dr2
84 cmp dl, 3
85 jz .set_dr3
86 cmp dl, 4
87 jz .set_dr4
88 cmp dl, 5
89 jz .set_dr5
90
91 call Bs3Panic
92
93.set_dr0:
94 mov dr0, sSI
95 jmp .return
96.set_dr1:
97 mov dr1, sSI
98 jmp .return
99.set_dr2:
100 mov dr2, sSI
101 jmp .return
102.set_dr3:
103 mov dr3, sSI
104 jmp .return
105.set_dr4:
106 mov dr4, sSI
107 jmp .return
108.set_dr5:
109 mov dr5, sSI
110 jmp .return
111.set_dr7:
112 mov dr7, sSI
113 jmp .return
114.set_dr6:
115 mov dr6, sSI
116 jmp .return
117
118.via_system_call:
119 mov dl, [xBP + xCB + cbCurRetAddr]
120 push xAX
121 mov xAX, BS3_SYSCALL_SET_DRX
122 call Bs3Syscall
123 pop xAX
124
125.return:
126 pop xDX
127 pop sSI
128 pop xBP
129 BS3_CALL_CONV_EPILOG 2
130 BS3_HYBRID_RET
131BS3_PROC_END_CMN Bs3RegSetDrX
132
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