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| #if !(UNITY_STANDALONE_OSX || UNITY_EDITOR_OSX)
| using System;
| using System.Collections.Generic;
| using System.Reflection;
| using System.Runtime.InteropServices;
| using System.Text;
| using UnityEngine;
|
| namespace MonoHook
| {
| public static unsafe class HookUtils
| {
| [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
| delegate void DelegateFlushICache(void* code, int size); // delegate * unmanaged[Cdecl] <void, byte, uint> native_flush_cache_fun_ptr; // unsupported at C# 8.0
|
| static DelegateFlushICache flush_icache;
| private static readonly long _Pagesize;
|
| static HookUtils()
| {
| PropertyInfo p_SystemPageSize = typeof(Environment).GetProperty("SystemPageSize");
| if (p_SystemPageSize == null)
| throw new NotSupportedException("Unsupported runtime");
| _Pagesize = (int)p_SystemPageSize.GetValue(null, new object[0]);
| SetupFlushICacheFunc();
| }
|
| public static void MemCpy(void* pDst, void* pSrc, int len)
| {
| byte* pDst_ = (byte*)pDst;
| byte* pSrc_ = (byte*)pSrc;
|
| for (int i = 0; i < len; i++)
| *pDst_++ = *pSrc_++;
| }
|
| public static void MemCpy_Jit(void* pDst, byte[] src)
| {
| fixed (void* p = &src[0])
| {
| MemCpy(pDst, p, src.Length);
| }
| }
|
| /// <summary>
| /// set flags of address to `read write execute`
| /// </summary>
| public static void SetAddrFlagsToRWX(IntPtr ptr, int size)
| {
| if (ptr == IntPtr.Zero)
| return;
|
| #if UNITY_STANDALONE_WIN || UNITY_EDITOR_WIN
| uint oldProtect;
| bool ret = VirtualProtect(ptr, (uint)size, Protection.PAGE_EXECUTE_READWRITE, out oldProtect);
| UnityEngine.Debug.Assert(ret);
| #else
| SetMemPerms(ptr,(ulong)size,MmapProts.PROT_READ | MmapProts.PROT_WRITE | MmapProts.PROT_EXEC);
| #endif
| }
|
| public static void FlushICache(void* code, int size)
| {
| if (code == null)
| return;
|
| flush_icache?.Invoke(code, size);
|
| #if ENABLE_HOOK_DEBUG
| Debug.Log($"flush icache at 0x{(IntPtr.Size == 4 ? (uint)code : (ulong)code):x}, size:{size}");
| #endif
| }
|
| public static KeyValuePair<long, long> GetPageAlignedAddr(long code, int size)
| {
| long pagesize = _Pagesize;
| long startPage = (code) & ~(pagesize - 1);
| long endPage = (code + size + pagesize - 1) & ~(pagesize - 1);
| return new KeyValuePair<long, long>(startPage, endPage);
| }
|
|
| const int PRINT_SPLIT = 4;
| const int PRINT_COL_SIZE = PRINT_SPLIT * 4;
| public static string HexToString(void* ptr, int size, int offset = 0)
| {
| Func<IntPtr, string> formatAddr = (IntPtr addr__) => IntPtr.Size == 4 ? $"0x{(uint)addr__:x}" : $"0x{(ulong)addr__:x}";
|
| byte* addr = (byte*)ptr;
|
| StringBuilder sb = new StringBuilder(1024);
| sb.AppendLine($"addr:{formatAddr(new IntPtr(addr))}");
|
| addr += offset;
| size += Math.Abs(offset);
|
| int count = 0;
| while (true)
| {
| sb.Append($"\r\n{formatAddr(new IntPtr(addr + count))}: ");
| for (int i = 1; i < PRINT_COL_SIZE + 1; i++)
| {
| if (count >= size)
| goto END;
|
| sb.Append($"{*(addr + count):x2}");
| if (i % PRINT_SPLIT == 0)
| sb.Append(" ");
|
| count++;
| }
| }
| END:;
| return sb.ToString();
| }
|
| static void SetupFlushICacheFunc()
| {
| string processorType = SystemInfo.processorType.ToLowerInvariant();
| if (processorType.Contains("intel") || processorType.Contains("amd"))
| return;
|
| if (IntPtr.Size == 4)
| {
| // never release, so save GCHandle is unnecessary
| s_ptr_flush_icache_arm32 = GCHandle.Alloc(s_flush_icache_arm32, GCHandleType.Pinned).AddrOfPinnedObject().ToPointer();
| SetAddrFlagsToRWX(new IntPtr(s_ptr_flush_icache_arm32), s_flush_icache_arm32.Length);
| flush_icache = Marshal.GetDelegateForFunctionPointer<DelegateFlushICache>(new IntPtr(s_ptr_flush_icache_arm32));
| }
| else
| {
| s_ptr_flush_icache_arm64 = GCHandle.Alloc(s_flush_icache_arm64, GCHandleType.Pinned).AddrOfPinnedObject().ToPointer();
| SetAddrFlagsToRWX(new IntPtr(s_ptr_flush_icache_arm64), s_flush_icache_arm64.Length);
| flush_icache = Marshal.GetDelegateForFunctionPointer<DelegateFlushICache>(new IntPtr(s_ptr_flush_icache_arm64));
| }
|
| #if ENABLE_HOOK_DEBUG
| Debug.Log($"flush_icache delegate is {((flush_icache != null) ? "not " : "")}null");
| #endif
| }
|
|
| static void* s_ptr_flush_icache_arm32, s_ptr_flush_icache_arm64;
| private static byte[] s_flush_icache_arm32 = new byte[]
| {
| // void cdecl mono_arch_flush_icache (guint8 *code, gint size)
| 0x00, 0x48, 0x2D, 0xE9, // PUSH {R11,LR}
| 0x0D, 0xB0, 0xA0, 0xE1, // MOV R11, SP
| 0x08, 0xD0, 0x4D, 0xE2, // SUB SP, SP, #8
| 0x04, 0x00, 0x8D, 0xE5, // STR R0, [SP,#8+var_4]
| 0x00, 0x10, 0x8D, 0xE5, // STR R1, [SP,#8+var_8]
| 0x04, 0x00, 0x9D, 0xE5, // LDR R0, [SP,#8+var_4]
| 0x04, 0x10, 0x9D, 0xE5, // LDR R1, [SP,#8+var_4]
| 0x00, 0x20, 0x9D, 0xE5, // LDR R2, [SP,#8+var_8]
| 0x02, 0x10, 0x81, 0xE0, // ADD R1, R1, R2
| 0x01, 0x00, 0x00, 0xEB, // BL __clear_cache
| 0x0B, 0xD0, 0xA0, 0xE1, // MOV SP, R11
| 0x00, 0x88, 0xBD, 0xE8, // POP {R11,PC}
|
| // __clear_cache ; CODE XREF: j___clear_cache+8↑j
| 0x80, 0x00, 0x2D, 0xE9, // PUSH { R7 }
| 0x02, 0x70, 0x00, 0xE3, 0x0F, 0x70, 0x40, 0xE3, // MOV R7, #0xF0002
| 0x00, 0x20, 0xA0, 0xE3, // MOV R2, #0
| 0x00, 0x00, 0x00, 0xEF, // SVC 0
| 0x80, 0x00, 0xBD, 0xE8, // POP {R7}
| 0x1E, 0xFF, 0x2F, 0xE1, // BX LR
| };
|
| private static byte[] s_flush_icache_arm64 = new byte[] // X0: code, W1: size
| {
| // void cdecl mono_arch_flush_icache (guint8 *code, gint size)
| 0xFF, 0xC3, 0x00, 0xD1, // SUB SP, SP, #0x30
| 0xE8, 0x03, 0x7E, 0xB2, // MOV X8, #4
| 0xE0, 0x17, 0x00, 0xF9, // STR X0, [SP,#0x30+var_8]
| 0xE1, 0x27, 0x00, 0xB9, // STR W1, [SP,#0x30+var_C]
| 0xE0, 0x17, 0x40, 0xF9, // LDR X0, [SP,#0x30+var_8]
| 0xE9, 0x27, 0x80, 0xB9, // LDRSW X9, [SP,#0x30+var_C]
| 0x09, 0x00, 0x09, 0x8B, // ADD X9, X0, X9
| 0xE9, 0x0F, 0x00, 0xF9, // STR X9, [SP,#0x30+var_18]
| 0xE8, 0x07, 0x00, 0xF9, // STR X8, [SP,#0x30+var_28]
| 0xE8, 0x03, 0x00, 0xF9, // STR X8, [SP,#0x30+var_30]
| 0xE8, 0x17, 0x40, 0xF9, // LDR X8, [SP,#0x30+var_8]
| 0x08, 0xF5, 0x7E, 0x92, // AND X8, X8, #0xFFFFFFFFFFFFFFFC
| 0xE8, 0x0B, 0x00, 0xF9, // STR X8, [SP,#0x30+var_20]
|
| // loc_590 ; CODE XREF: mono_arch_flush_icache(uchar*, int)+58↓j
| 0xE8, 0x0B, 0x40, 0xF9, // LDR X8, [SP,#0x30+var_20]
| 0xE9, 0x0F, 0x40, 0xF9, // LDR X9, [SP,#0x30+var_18]
| 0x1F, 0x01, 0x09, 0xEB, // CMP X8, X9
| 0xE2, 0x00, 0x00, 0x54, // B.CS loc_5B8
| 0xE8, 0x0B, 0x40, 0xF9, // LDR X8, [SP,#0x30+var_20]
| 0x28, 0x7E, 0x0B, 0xD5, // SYS #3, c7, c14, #1, X8
| 0xE8, 0x0B, 0x40, 0xF9, // LDR X8, [SP,#0x30+var_20]
| 0x08, 0x11, 0x00, 0x91, // ADD X8, X8, #4
| 0xE8, 0x0B, 0x00, 0xF9, // STR X8, [SP,#0x30+var_20]
| 0xF7, 0xFF, 0xFF, 0x17, // B loc_590
| // ; ---------------------------------------------------------------------------
|
| // loc_5B8 ; CODE XREF: mono_arch_flush_icache(uchar *, int)+40↑j
| 0x9F, 0x3B, 0x03, 0xD5, // DSB ISH
| 0xE8, 0x17, 0x40, 0xF9, // LDR X8, [SP,#0x30+var_8]
| 0x08, 0xF5, 0x7E, 0x92, // AND X8, X8, #0xFFFFFFFFFFFFFFFC
| 0xE8, 0x0B, 0x00, 0xF9, // STR X8, [SP,#0x30+var_20]
|
| // loc_5C8 ; CODE XREF: mono_arch_flush_icache(uchar *, int)+90↓j
| 0xE8, 0x0B, 0x40, 0xF9, // LDR X8, [SP,#0x30+var_20]
| 0xE9, 0x0F, 0x40, 0xF9, // LDR X9, [SP,#0x30+var_18]
| 0x1F, 0x01, 0x09, 0xEB, // CMP X8, X9
| 0xE2, 0x00, 0x00, 0x54, // B.CS loc_5F0
| 0xE8, 0x0B, 0x40, 0xF9, // LDR X8, [SP,#0x30+var_20]
| 0x28, 0x75, 0x0B, 0xD5, // SYS #3, c7, c5, #1, X8
| 0xE8, 0x0B, 0x40, 0xF9, // LDR X8, [SP,#0x30+var_20]
| 0x08, 0x11, 0x00, 0x91, // ADD X8, X8, #4
| 0xE8, 0x0B, 0x00, 0xF9, // STR X8, [SP,#0x30+var_20]
| 0xF7, 0xFF, 0xFF, 0x17, // B loc_5C8
| // ; ---------------------------------------------------------------------------
|
| // loc_5F0 ; CODE XREF: mono_arch_flush_icache(uchar *, int)+78↑j
| 0x9F, 0x3B, 0x03, 0xD5, // DSB ISH
| 0xDF, 0x3F, 0x03, 0xD5, // ISB
| 0xFF, 0xC3, 0x00, 0x91, // ADD SP, SP, #0x30 ; '0'
| 0xC0, 0x03, 0x5F, 0xD6, // RET
| };
|
|
| #if UNITY_STANDALONE_WIN || UNITY_EDITOR_WIN
| [Flags]
| public enum Protection
| {
| PAGE_NOACCESS = 0x01,
| PAGE_READONLY = 0x02,
| PAGE_READWRITE = 0x04,
| PAGE_WRITECOPY = 0x08,
| PAGE_EXECUTE = 0x10,
| PAGE_EXECUTE_READ = 0x20,
| PAGE_EXECUTE_READWRITE = 0x40,
| PAGE_EXECUTE_WRITECOPY = 0x80,
| PAGE_GUARD = 0x100,
| PAGE_NOCACHE = 0x200,
| PAGE_WRITECOMBINE = 0x400
| }
|
| [DllImport("kernel32")]
| public static extern bool VirtualProtect(IntPtr lpAddress, uint dwSize, Protection flNewProtect, out uint lpflOldProtect);
|
| #else
| [Flags]
| public enum MmapProts : int {
| PROT_READ = 0x1,
| PROT_WRITE = 0x2,
| PROT_EXEC = 0x4,
| PROT_NONE = 0x0,
| PROT_GROWSDOWN = 0x01000000,
| PROT_GROWSUP = 0x02000000,
| }
|
| [DllImport("libc", SetLastError = true, CallingConvention = CallingConvention.Cdecl)]
| private static extern int mprotect(IntPtr start, IntPtr len, MmapProts prot);
|
| public static unsafe void SetMemPerms(IntPtr start, ulong len, MmapProts prot) {
| var requiredAddr = GetPageAlignedAddr(start.ToInt64(), (int)len);
| long startPage = requiredAddr.Key;
| long endPage = requiredAddr.Value;
|
| if (mprotect((IntPtr) startPage, (IntPtr) (endPage - startPage), prot) != 0)
| throw new Exception($"mprotect with prot:{prot} fail!");
| }
| #endif
| }
| }
|
| #endif
|
|
