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https://github.com/Ryujinx/Ryujinx.git
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* Improve IRDumper * Make Symbols.Add(ulong, ulong, ulong, string) thread safe * Use a StringBuilder for MemoryOperand * Add #if M_DEBUG guards * Fix JMP_TABLE typo * Fix using in Symbols * Use Conditional("M_DEBUG") instead Address gdkchan's feedback * Use a struct instead of 4-tuple Address gdkchan's feedback * Place symbols in comments instead Address gdkchan's feedback * Use StringBuilder throughout * Handle offsetted symbols * Fix naming convention of Builder * Avoid ArgumentException * Remove unnecessary using * Use switch expression instead * Turn into a class * Clean up * Remove unnecessary using
145 lines
6 KiB
C#
145 lines
6 KiB
C#
using ARMeilleure.Diagnostics;
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using ARMeilleure.Memory;
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using System;
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using System.Collections.Concurrent;
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using System.Collections.Generic;
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using System.Runtime.InteropServices;
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using System.Threading;
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namespace ARMeilleure.Translation
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{
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class JumpTable
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{
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// The jump table is a block of (guestAddress, hostAddress) function mappings.
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// Each entry corresponds to one branch in a JIT compiled function. The entries are
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// reserved specifically for each call.
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// The _dependants dictionary can be used to update the hostAddress for any functions that change.
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public const int JumpTableStride = 16; // 8 byte guest address, 8 byte host address
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private const int JumpTableSize = 1048576;
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private const int JumpTableByteSize = JumpTableSize * JumpTableStride;
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// The dynamic table is also a block of (guestAddress, hostAddress) function mappings.
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// The main difference is that indirect calls and jumps reserve _multiple_ entries on the table.
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// These start out as all 0. When an indirect call is made, it tries to find the guest address on the table.
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// If we get to an empty address, the guestAddress is set to the call that we want.
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// If we get to a guestAddress that matches our own (or we just claimed it), the hostAddress is read.
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// If it is non-zero, we immediately branch or call the host function.
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// If it is 0, NativeInterface is called to find the rejited address of the call.
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// If none is found, the hostAddress entry stays at 0. Otherwise, the new address is placed in the entry.
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// If the table size is exhausted and we didn't find our desired address, we fall back to requesting
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// the function from the JIT.
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private const int DynamicTableSize = 1048576;
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public const int DynamicTableElems = 1;
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public const int DynamicTableStride = DynamicTableElems * JumpTableStride;
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private const int DynamicTableByteSize = DynamicTableSize * JumpTableStride * DynamicTableElems;
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private int _tableEnd = 0;
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private int _dynTableEnd = 0;
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private ConcurrentDictionary<ulong, TranslatedFunction> _targets;
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private ConcurrentDictionary<ulong, LinkedList<int>> _dependants; // TODO: Attach to TranslatedFunction or a wrapper class.
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private ReservedRegion _jumpRegion;
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private ReservedRegion _dynamicRegion;
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public IntPtr JumpPointer => _jumpRegion.Pointer;
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public IntPtr DynamicPointer => _dynamicRegion.Pointer;
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public JumpTable(IJitMemoryAllocator allocator)
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{
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_jumpRegion = new ReservedRegion(allocator, JumpTableByteSize);
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_dynamicRegion = new ReservedRegion(allocator, DynamicTableByteSize);
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_targets = new ConcurrentDictionary<ulong, TranslatedFunction>();
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_dependants = new ConcurrentDictionary<ulong, LinkedList<int>>();
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Symbols.Add((ulong)_jumpRegion.Pointer.ToInt64(), JumpTableByteSize, JumpTableStride, "JMP_TABLE");
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Symbols.Add((ulong)_dynamicRegion.Pointer.ToInt64(), DynamicTableByteSize, DynamicTableStride, "DYN_TABLE");
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}
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public void RegisterFunction(ulong address, TranslatedFunction func)
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{
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address &= ~3UL;
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_targets.AddOrUpdate(address, func, (key, oldFunc) => func);
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long funcPtr = func.GetPointer().ToInt64();
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// Update all jump table entries that target this address.
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if (_dependants.TryGetValue(address, out LinkedList<int> myDependants))
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{
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lock (myDependants)
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{
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foreach (var entry in myDependants)
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{
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IntPtr addr = _jumpRegion.Pointer + entry * JumpTableStride;
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Marshal.WriteInt64(addr, 8, funcPtr);
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}
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}
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}
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}
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public int ReserveDynamicEntry(bool isJump)
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{
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int entry = Interlocked.Increment(ref _dynTableEnd);
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if (entry >= DynamicTableSize)
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{
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throw new OutOfMemoryException("JIT Dynamic Jump Table exhausted.");
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}
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_dynamicRegion.ExpandIfNeeded((ulong)((entry + 1) * DynamicTableStride));
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// Initialize all host function pointers to the indirect call stub.
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IntPtr addr = _dynamicRegion.Pointer + entry * DynamicTableStride;
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long stubPtr = (long)DirectCallStubs.IndirectCallStub(isJump);
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for (int i = 0; i < DynamicTableElems; i++)
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{
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Marshal.WriteInt64(addr, i * JumpTableStride + 8, stubPtr);
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}
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return entry;
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}
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public int ReserveTableEntry(long ownerAddress, long address, bool isJump)
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{
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int entry = Interlocked.Increment(ref _tableEnd);
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if (entry >= JumpTableSize)
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{
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throw new OutOfMemoryException("JIT Direct Jump Table exhausted.");
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}
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_jumpRegion.ExpandIfNeeded((ulong)((entry + 1) * JumpTableStride));
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// Is the address we have already registered? If so, put the function address in the jump table.
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// If not, it will point to the direct call stub.
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long value = (long)DirectCallStubs.DirectCallStub(isJump);
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if (_targets.TryGetValue((ulong)address, out TranslatedFunction func))
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{
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value = func.GetPointer().ToInt64();
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}
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// Make sure changes to the function at the target address update this jump table entry.
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LinkedList<int> targetDependants = _dependants.GetOrAdd((ulong)address, (addr) => new LinkedList<int>());
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lock (targetDependants)
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{
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targetDependants.AddLast(entry);
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}
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IntPtr addr = _jumpRegion.Pointer + entry * JumpTableStride;
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Marshal.WriteInt64(addr, 0, address);
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Marshal.WriteInt64(addr, 8, value);
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return entry;
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}
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}
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}
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