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
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
|
using System;
using System.Collections.Concurrent;
using System.Runtime.InteropServices;
using System.Runtime.Versioning;
using static Ryujinx.Memory.MemoryManagerUnixHelper;
namespace Ryujinx.Memory
{
[SupportedOSPlatform("linux")]
[SupportedOSPlatform("macos")]
static class MemoryManagementUnix
{
private static readonly ConcurrentDictionary<IntPtr, ulong> _allocations = new();
public static IntPtr Allocate(ulong size, bool forJit)
{
return AllocateInternal(size, MmapProts.PROT_READ | MmapProts.PROT_WRITE, forJit);
}
public static IntPtr Reserve(ulong size, bool forJit)
{
return AllocateInternal(size, MmapProts.PROT_NONE, forJit);
}
private static IntPtr AllocateInternal(ulong size, MmapProts prot, bool forJit, bool shared = false)
{
MmapFlags flags = MmapFlags.MAP_ANONYMOUS;
if (shared)
{
flags |= MmapFlags.MAP_SHARED | MmapFlags.MAP_UNLOCKED;
}
else
{
flags |= MmapFlags.MAP_PRIVATE;
}
if (prot == MmapProts.PROT_NONE)
{
flags |= MmapFlags.MAP_NORESERVE;
}
if (OperatingSystem.IsMacOSVersionAtLeast(10, 14) && forJit)
{
flags |= MmapFlags.MAP_JIT_DARWIN;
if (prot == (MmapProts.PROT_READ | MmapProts.PROT_WRITE))
{
prot |= MmapProts.PROT_EXEC;
}
}
IntPtr ptr = mmap(IntPtr.Zero, size, prot, flags, -1, 0);
if (ptr == MAP_FAILED)
{
throw new SystemException(Marshal.GetLastPInvokeErrorMessage());
}
if (!_allocations.TryAdd(ptr, size))
{
// This should be impossible, kernel shouldn't return an already mapped address.
throw new InvalidOperationException();
}
return ptr;
}
public static void Commit(IntPtr address, ulong size, bool forJit)
{
MmapProts prot = MmapProts.PROT_READ | MmapProts.PROT_WRITE;
if (OperatingSystem.IsMacOSVersionAtLeast(10, 14) && forJit)
{
prot |= MmapProts.PROT_EXEC;
}
if (mprotect(address, size, prot) != 0)
{
throw new SystemException(Marshal.GetLastPInvokeErrorMessage());
}
}
public static void Decommit(IntPtr address, ulong size)
{
// Must be writable for madvise to work properly.
if (mprotect(address, size, MmapProts.PROT_READ | MmapProts.PROT_WRITE) != 0)
{
throw new SystemException(Marshal.GetLastPInvokeErrorMessage());
}
if (madvise(address, size, MADV_REMOVE) != 0)
{
throw new SystemException(Marshal.GetLastPInvokeErrorMessage());
}
if (mprotect(address, size, MmapProts.PROT_NONE) != 0)
{
throw new SystemException(Marshal.GetLastPInvokeErrorMessage());
}
}
public static bool Reprotect(IntPtr address, ulong size, MemoryPermission permission)
{
return mprotect(address, size, GetProtection(permission)) == 0;
}
private static MmapProts GetProtection(MemoryPermission permission)
{
return permission switch
{
MemoryPermission.None => MmapProts.PROT_NONE,
MemoryPermission.Read => MmapProts.PROT_READ,
MemoryPermission.ReadAndWrite => MmapProts.PROT_READ | MmapProts.PROT_WRITE,
MemoryPermission.ReadAndExecute => MmapProts.PROT_READ | MmapProts.PROT_EXEC,
MemoryPermission.ReadWriteExecute => MmapProts.PROT_READ | MmapProts.PROT_WRITE | MmapProts.PROT_EXEC,
MemoryPermission.Execute => MmapProts.PROT_EXEC,
_ => throw new MemoryProtectionException(permission)
};
}
public static bool Free(IntPtr address)
{
if (_allocations.TryRemove(address, out ulong size))
{
return munmap(address, size) == 0;
}
return false;
}
public static bool Unmap(IntPtr address, ulong size)
{
return munmap(address, size) == 0;
}
public unsafe static IntPtr CreateSharedMemory(ulong size, bool reserve)
{
int fd;
if (OperatingSystem.IsMacOS())
{
byte[] memName = "Ryujinx-XXXXXX"u8.ToArray();
fixed (byte* pMemName = memName)
{
fd = shm_open((IntPtr)pMemName, 0x2 | 0x200 | 0x800 | 0x400, 384); // O_RDWR | O_CREAT | O_EXCL | O_TRUNC, 0600
if (fd == -1)
{
throw new OutOfMemoryException();
}
if (shm_unlink((IntPtr)pMemName) != 0)
{
throw new OutOfMemoryException();
}
}
}
else
{
byte[] fileName = "/dev/shm/Ryujinx-XXXXXX"u8.ToArray();
fixed (byte* pFileName = fileName)
{
fd = mkstemp((IntPtr)pFileName);
if (fd == -1)
{
throw new OutOfMemoryException();
}
if (unlink((IntPtr)pFileName) != 0)
{
throw new OutOfMemoryException();
}
}
}
if (ftruncate(fd, (IntPtr)size) != 0)
{
throw new OutOfMemoryException();
}
return (IntPtr)fd;
}
public static void DestroySharedMemory(IntPtr handle)
{
close((int)handle);
}
public static IntPtr MapSharedMemory(IntPtr handle, ulong size)
{
return mmap(IntPtr.Zero, size, MmapProts.PROT_READ | MmapProts.PROT_WRITE, MmapFlags.MAP_SHARED, (int)handle, 0);
}
public static void UnmapSharedMemory(IntPtr address, ulong size)
{
munmap(address, size);
}
public static void MapView(IntPtr sharedMemory, ulong srcOffset, IntPtr location, ulong size)
{
mmap(location, size, MmapProts.PROT_READ | MmapProts.PROT_WRITE, MmapFlags.MAP_FIXED | MmapFlags.MAP_SHARED, (int)sharedMemory, (long)srcOffset);
}
public static void UnmapView(IntPtr location, ulong size)
{
mmap(location, size, MmapProts.PROT_NONE, MmapFlags.MAP_FIXED | MmapFlags.MAP_PRIVATE | MmapFlags.MAP_ANONYMOUS | MmapFlags.MAP_NORESERVE, -1, 0);
}
}
}
|