1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
|
/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "SharedBufferRegion.h"
#include "Emulator.h"
#include <Kernel/API/Syscall.h>
#include <serenity.h>
#include <string.h>
#include <sys/mman.h>
namespace UserspaceEmulator {
NonnullOwnPtr<SharedBufferRegion> SharedBufferRegion::create_with_shbuf_id(u32 base, u32 size, int shbuf_id, u8* host_data)
{
return adopt_own(*new SharedBufferRegion(base, size, shbuf_id, host_data));
}
SharedBufferRegion::SharedBufferRegion(u32 base, u32 size, int shbuf_id, u8* host_data)
: Region(base, size)
, m_data(host_data)
, m_shbuf_id(shbuf_id)
{
m_shadow_data = (u8*)malloc(size);
memset(m_shadow_data, 1, size);
}
SharedBufferRegion::~SharedBufferRegion()
{
free(m_shadow_data);
}
ValueWithShadow<u8> SharedBufferRegion::read8(FlatPtr offset)
{
ASSERT(offset < size());
return { *reinterpret_cast<const u8*>(m_data + offset), *reinterpret_cast<const u8*>(m_shadow_data + offset) };
}
ValueWithShadow<u16> SharedBufferRegion::read16(u32 offset)
{
ASSERT(offset + 1 < size());
return { *reinterpret_cast<const u16*>(m_data + offset), *reinterpret_cast<const u16*>(m_shadow_data + offset) };
}
ValueWithShadow<u32> SharedBufferRegion::read32(u32 offset)
{
ASSERT(offset + 3 < size());
return { *reinterpret_cast<const u32*>(m_data + offset), *reinterpret_cast<const u32*>(m_shadow_data + offset) };
}
ValueWithShadow<u64> SharedBufferRegion::read64(u32 offset)
{
ASSERT(offset + 7 < size());
return { *reinterpret_cast<const u64*>(m_data + offset), *reinterpret_cast<const u64*>(m_shadow_data + offset) };
}
void SharedBufferRegion::write8(u32 offset, ValueWithShadow<u8> value)
{
ASSERT(offset < size());
*reinterpret_cast<u8*>(m_data + offset) = value.value();
*reinterpret_cast<u8*>(m_shadow_data + offset) = value.shadow();
}
void SharedBufferRegion::write16(u32 offset, ValueWithShadow<u16> value)
{
ASSERT(offset + 1 < size());
*reinterpret_cast<u16*>(m_data + offset) = value.value();
*reinterpret_cast<u16*>(m_shadow_data + offset) = value.shadow();
}
void SharedBufferRegion::write32(u32 offset, ValueWithShadow<u32> value)
{
ASSERT(offset + 3 < size());
*reinterpret_cast<u32*>(m_data + offset) = value.value();
*reinterpret_cast<u32*>(m_shadow_data + offset) = value.shadow();
}
void SharedBufferRegion::write64(u32 offset, ValueWithShadow<u64> value)
{
ASSERT(offset + 7 < size());
*reinterpret_cast<u64*>(m_data + offset) = value.value();
*reinterpret_cast<u64*>(m_shadow_data + offset) = value.shadow();
}
int SharedBufferRegion::allow_all()
{
return syscall(SC_shbuf_allow_all, m_shbuf_id);
}
int SharedBufferRegion::allow_pid(pid_t pid)
{
return syscall(SC_shbuf_allow_pid, m_shbuf_id, pid);
}
int SharedBufferRegion::seal()
{
return syscall(SC_shbuf_seal, m_shbuf_id);
}
int SharedBufferRegion::release()
{
return syscall(SC_shbuf_release, m_shbuf_id);
}
}
|
