diff options
| author | gdkchan <gab.dark.100@gmail.com> | 2019-02-18 20:52:06 -0300 |
|---|---|---|
| committer | jduncanator <1518948+jduncanator@users.noreply.github.com> | 2019-02-19 10:52:06 +1100 |
| commit | 932224f05112180aa5f52162cbbc3a17c339075f (patch) | |
| tree | eed53f37bfd78db97d6f8301c021b7de9dd3becf /ChocolArm64/Memory/MemoryAllocUnix.cs | |
| parent | dd00a4b62d48b7d55a6e66a69a83f09267d34143 (diff) | |
ARM exclusive monitor and multicore fixes (#589)
* Implement ARM exclusive load/store with compare exchange insts, and enable multicore by default
* Fix comment typo
* Support Linux and OSX on MemoryAlloc and CompareExchange128, some cleanup
* Use intel syntax on assembly code
* Adjust identation
* Add CPUID check and fix exclusive reservation granule size
* Update schema multicore scheduling default value
* Make the cpu id check code lower case aswell
Diffstat (limited to 'ChocolArm64/Memory/MemoryAllocUnix.cs')
| -rw-r--r-- | ChocolArm64/Memory/MemoryAllocUnix.cs | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/ChocolArm64/Memory/MemoryAllocUnix.cs b/ChocolArm64/Memory/MemoryAllocUnix.cs new file mode 100644 index 00000000..857c1c50 --- /dev/null +++ b/ChocolArm64/Memory/MemoryAllocUnix.cs @@ -0,0 +1,70 @@ +using Mono.Unix.Native; +using System; + +namespace ChocolArm64.Memory +{ + static class MemoryAllocUnix + { + public static IntPtr Allocate(ulong size) + { + ulong pageSize = (ulong)Syscall.sysconf(SysconfName._SC_PAGESIZE); + + const MmapProts prot = MmapProts.PROT_READ | MmapProts.PROT_WRITE; + + const MmapFlags flags = MmapFlags.MAP_PRIVATE | MmapFlags.MAP_ANONYMOUS; + + IntPtr ptr = Syscall.mmap(IntPtr.Zero, size + pageSize, prot, flags, -1, 0); + + if (ptr == IntPtr.Zero) + { + throw new OutOfMemoryException(); + } + + unsafe + { + ptr = new IntPtr(ptr.ToInt64() + (long)pageSize); + + *((ulong*)ptr - 1) = size; + } + + return ptr; + } + + public static bool Reprotect(IntPtr address, ulong size, Memory.MemoryProtection protection) + { + MmapProts prot = GetProtection(protection); + + return Syscall.mprotect(address, size, prot) == 0; + } + + private static MmapProts GetProtection(Memory.MemoryProtection protection) + { + switch (protection) + { + case Memory.MemoryProtection.None: return MmapProts.PROT_NONE; + case Memory.MemoryProtection.Read: return MmapProts.PROT_READ; + case Memory.MemoryProtection.ReadAndWrite: return MmapProts.PROT_READ | MmapProts.PROT_WRITE; + case Memory.MemoryProtection.ReadAndExecute: return MmapProts.PROT_READ | MmapProts.PROT_EXEC; + case Memory.MemoryProtection.Execute: return MmapProts.PROT_EXEC; + + default: throw new ArgumentException($"Invalid permission \"{protection}\"."); + } + } + + public static bool Free(IntPtr address) + { + ulong pageSize = (ulong)Syscall.sysconf(SysconfName._SC_PAGESIZE); + + ulong size; + + unsafe + { + size = *((ulong*)address - 1); + + address = new IntPtr(address.ToInt64() - (long)pageSize); + } + + return Syscall.munmap(address, size + pageSize) == 0; + } + } +}
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