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
|
// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include "common/scope_exit.h"
#include "core/core.h"
#include "core/hle/kernel/k_process.h"
#include "core/hle/kernel/k_shared_memory.h"
#include "core/hle/kernel/svc.h"
namespace Kernel::Svc {
namespace {
constexpr bool IsValidSharedMemoryPermission(MemoryPermission perm) {
switch (perm) {
case MemoryPermission::Read:
case MemoryPermission::ReadWrite:
return true;
default:
return false;
}
}
[[maybe_unused]] constexpr bool IsValidRemoteSharedMemoryPermission(MemoryPermission perm) {
return IsValidSharedMemoryPermission(perm) || perm == MemoryPermission::DontCare;
}
} // namespace
Result MapSharedMemory(Core::System& system, Handle shmem_handle, VAddr address, u64 size,
Svc::MemoryPermission map_perm) {
LOG_TRACE(Kernel_SVC,
"called, shared_memory_handle=0x{:X}, addr=0x{:X}, size=0x{:X}, permissions=0x{:08X}",
shmem_handle, address, size, map_perm);
// Validate the address/size.
R_UNLESS(Common::IsAligned(address, PageSize), ResultInvalidAddress);
R_UNLESS(Common::IsAligned(size, PageSize), ResultInvalidSize);
R_UNLESS(size > 0, ResultInvalidSize);
R_UNLESS((address < address + size), ResultInvalidCurrentMemory);
// Validate the permission.
R_UNLESS(IsValidSharedMemoryPermission(map_perm), ResultInvalidNewMemoryPermission);
// Get the current process.
auto& process = *system.Kernel().CurrentProcess();
auto& page_table = process.PageTable();
// Get the shared memory.
KScopedAutoObject shmem = process.GetHandleTable().GetObject<KSharedMemory>(shmem_handle);
R_UNLESS(shmem.IsNotNull(), ResultInvalidHandle);
// Verify that the mapping is in range.
R_UNLESS(page_table.CanContain(address, size, KMemoryState::Shared), ResultInvalidMemoryRegion);
// Add the shared memory to the process.
R_TRY(process.AddSharedMemory(shmem.GetPointerUnsafe(), address, size));
// Ensure that we clean up the shared memory if we fail to map it.
auto guard =
SCOPE_GUARD({ process.RemoveSharedMemory(shmem.GetPointerUnsafe(), address, size); });
// Map the shared memory.
R_TRY(shmem->Map(process, address, size, map_perm));
// We succeeded.
guard.Cancel();
return ResultSuccess;
}
Result MapSharedMemory32(Core::System& system, Handle shmem_handle, u32 address, u32 size,
Svc::MemoryPermission map_perm) {
return MapSharedMemory(system, shmem_handle, address, size, map_perm);
}
Result UnmapSharedMemory(Core::System& system, Handle shmem_handle, VAddr address, u64 size) {
// Validate the address/size.
R_UNLESS(Common::IsAligned(address, PageSize), ResultInvalidAddress);
R_UNLESS(Common::IsAligned(size, PageSize), ResultInvalidSize);
R_UNLESS(size > 0, ResultInvalidSize);
R_UNLESS((address < address + size), ResultInvalidCurrentMemory);
// Get the current process.
auto& process = *system.Kernel().CurrentProcess();
auto& page_table = process.PageTable();
// Get the shared memory.
KScopedAutoObject shmem = process.GetHandleTable().GetObject<KSharedMemory>(shmem_handle);
R_UNLESS(shmem.IsNotNull(), ResultInvalidHandle);
// Verify that the mapping is in range.
R_UNLESS(page_table.CanContain(address, size, KMemoryState::Shared), ResultInvalidMemoryRegion);
// Unmap the shared memory.
R_TRY(shmem->Unmap(process, address, size));
// Remove the shared memory from the process.
process.RemoveSharedMemory(shmem.GetPointerUnsafe(), address, size);
return ResultSuccess;
}
Result UnmapSharedMemory32(Core::System& system, Handle shmem_handle, u32 address, u32 size) {
return UnmapSharedMemory(system, shmem_handle, address, size);
}
} // namespace Kernel::Svc
|
