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71 lines
2.3 KiB
C#
71 lines
2.3 KiB
C#
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using Mono.Unix.Native;
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using System;
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namespace ARMeilleure.Memory
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{
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static class MemoryManagementUnix
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{
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public static IntPtr Allocate(ulong size)
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{
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ulong pageSize = (ulong)Syscall.sysconf(SysconfName._SC_PAGESIZE);
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const MmapProts prot = MmapProts.PROT_READ | MmapProts.PROT_WRITE;
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const MmapFlags flags = MmapFlags.MAP_PRIVATE | MmapFlags.MAP_ANONYMOUS;
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IntPtr ptr = Syscall.mmap(IntPtr.Zero, size + pageSize, prot, flags, -1, 0);
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if (ptr == IntPtr.Zero)
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{
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throw new OutOfMemoryException();
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}
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unsafe
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{
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ptr = new IntPtr(ptr.ToInt64() + (long)pageSize);
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*((ulong*)ptr - 1) = size;
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}
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return ptr;
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}
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public static bool Reprotect(IntPtr address, ulong size, Memory.MemoryProtection protection)
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{
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MmapProts prot = GetProtection(protection);
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return Syscall.mprotect(address, size, prot) == 0;
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}
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private static MmapProts GetProtection(Memory.MemoryProtection protection)
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{
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switch (protection)
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{
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case Memory.MemoryProtection.None: return MmapProts.PROT_NONE;
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case Memory.MemoryProtection.Read: return MmapProts.PROT_READ;
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case Memory.MemoryProtection.ReadAndWrite: return MmapProts.PROT_READ | MmapProts.PROT_WRITE;
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case Memory.MemoryProtection.ReadAndExecute: return MmapProts.PROT_READ | MmapProts.PROT_EXEC;
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case Memory.MemoryProtection.ReadWriteExecute: return MmapProts.PROT_READ | MmapProts.PROT_WRITE | MmapProts.PROT_EXEC;
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case Memory.MemoryProtection.Execute: return MmapProts.PROT_EXEC;
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default: throw new ArgumentException($"Invalid permission \"{protection}\".");
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}
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}
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public static bool Free(IntPtr address)
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{
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ulong pageSize = (ulong)Syscall.sysconf(SysconfName._SC_PAGESIZE);
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ulong size;
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unsafe
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{
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size = *((ulong*)address - 1);
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address = new IntPtr(address.ToInt64() - (long)pageSize);
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}
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return Syscall.munmap(address, size + pageSize) == 0;
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}
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}
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}
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