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3 commits
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eec8ee7094 | ||
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6ba735eefb |
2 changed files with 59 additions and 36 deletions
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@ -1,6 +1,7 @@
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using System.Text.Unicode;
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using Dalamud.Hooking;
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using Iced.Intel;
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using static Iced.Intel.AssemblerRegisters;
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using OtterGui.Extensions;
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using Penumbra.String.Classes;
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using Swan;
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@ -46,36 +47,32 @@ public sealed class PapRewriter(PeSigScanner sigScanner, PapRewriter.PapResource
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stackAccesses.RemoveAll(instr => instr.IP == hp.IP);
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var detourPointer = Marshal.GetFunctionPointerForDelegate(papResourceHandler);
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var targetRegister = hookPoint.Op0Register.ToString().ToLower();
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var targetRegister = GetRegister64(hookPoint.Op0Register);
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var hookAddress = new IntPtr((long)detourPoint.IP);
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var caveAllocation = NativeAllocCave(16);
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var hook = new AsmHook(
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hookAddress,
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[
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"use64",
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$"mov {targetRegister}, 0x{stringAllocation:x8}", // Move our char *path into the relevant register (rdx)
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var assembler = new Assembler(64);
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assembler.mov(targetRegister, stringAllocation); // Move our char *path into the relevant register (rdx)
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// After this asm stub, we have a call to Crc32(); since r9 is a volatile, unused register, we can use it ourselves
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// We're essentially storing the original 2 arguments ('this', 'path'), in case they get mangled in our call
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// We technically don't need to save rdx ('path'), since it'll be stringLoc, but eh
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$"mov r9, 0x{caveAllocation:x8}",
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"mov [r9], rcx",
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"mov [r9+0x8], rdx",
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// After this asm stub, we have a call to Crc32(); since r9 is a volatile, unused register, we can use it ourselves
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// We're essentially storing the original 2 arguments ('this', 'path'), in case they get mangled in our call
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// We technically don't need to save rdx ('path'), since it'll be stringLoc, but eh
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assembler.mov(r9, caveAllocation);
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assembler.mov(__qword_ptr[r9], rcx);
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assembler.mov(__qword_ptr[r9 + 8], rdx);
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// We can use 'rax' here too since it's also volatile, and it'll be overwritten by Crc32()'s return anyway
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$"mov rax, 0x{detourPointer:x8}", // Get a pointer to our detour in place
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"call rax", // Call detour
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// We can use 'rax' here too since it's also volatile, and it'll be overwritten by Crc32()'s return anyway
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assembler.mov(rax, detourPointer);
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assembler.call(rax);
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// Do the reverse process and retrieve the stored stuff
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$"mov r9, 0x{caveAllocation:x8}",
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"mov rcx, [r9]",
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"mov rdx, [r9+0x8]",
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// Do the reverse process and retrieve the stored stuff
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assembler.mov(r9, caveAllocation);
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assembler.mov(rcx, __qword_ptr[r9]);
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assembler.mov(rdx, __qword_ptr[r9 + 8]);
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// Plop 'rax' (our return value, the path size) into r8, so it's the third argument for the subsequent Crc32() call
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"mov r8, rax",
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], $"{name}.PapRedirection"
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);
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// Plop 'rax' (our return value, the path size) into r8, so it's the third argument for the subsequent Crc32() call
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assembler.mov(r8, rax);
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var hook = new AsmHook(hookAddress, AssembleToBytes(assembler), $"{name}.PapRedirection");
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_hooks.Add(hookAddress, hook);
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hook.Enable();
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@ -95,19 +92,45 @@ public sealed class PapRewriter(PeSigScanner sigScanner, PapRewriter.PapResource
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if (_hooks.ContainsKey(hookAddress))
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continue;
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var targetRegister = stackAccess.Op0Register.ToString().ToLower();
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var hook = new AsmHook(
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hookAddress,
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[
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"use64",
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$"mov {targetRegister}, 0x{stringAllocation:x8}",
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], $"{name}.PapStackAccess[{index}]"
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);
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var targetRegister = GetRegister64(stackAccess.Op0Register);
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var assembler = new Assembler(64);
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assembler.mov(targetRegister, stringAllocation);
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var hook = new AsmHook(hookAddress, AssembleToBytes(assembler), $"{name}.PapStackAccess[{index}]");
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_hooks.Add(hookAddress, hook);
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hook.Enable();
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}
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}
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private static AssemblerRegister64 GetRegister64(Register reg)
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=> reg switch
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{
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Register.RAX => rax,
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Register.RCX => rcx,
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Register.RDX => rdx,
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Register.RBX => rbx,
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Register.RSP => rsp,
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Register.RBP => rbp,
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Register.RSI => rsi,
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Register.RDI => rdi,
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Register.R8 => r8,
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Register.R9 => r9,
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Register.R10 => r10,
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Register.R11 => r11,
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Register.R12 => r12,
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Register.R13 => r13,
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Register.R14 => r14,
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Register.R15 => r15,
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_ => throw new ArgumentOutOfRangeException(nameof(reg), reg, "Unsupported register."),
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};
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private static byte[] AssembleToBytes(Assembler assembler)
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{
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using var stream = new MemoryStream();
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var writer = new StreamCodeWriter(stream);
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assembler.Assemble(writer, 0);
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return stream.ToArray();
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}
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private static IEnumerable<Instruction> ScanStackAccesses(IEnumerable<Instruction> instructions, Instruction hookPoint)
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{
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10
repo.json
10
repo.json
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@ -5,8 +5,8 @@
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"Punchline": "Runtime mod loader and manager.",
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"Description": "Runtime mod loader and manager.",
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"InternalName": "Penumbra",
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"AssemblyVersion": "1.5.1.11",
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"TestingAssemblyVersion": "1.5.1.11",
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"AssemblyVersion": "1.5.1.13",
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"TestingAssemblyVersion": "1.5.1.13",
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"RepoUrl": "https://github.com/xivdev/Penumbra",
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"ApplicableVersion": "any",
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"DalamudApiLevel": 14,
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@ -18,9 +18,9 @@
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"LoadPriority": 69420,
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"LoadRequiredState": 2,
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"LoadSync": true,
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"DownloadLinkInstall": "https://github.com/xivdev/Penumbra/releases/download/1.5.1.11/Penumbra.zip",
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"DownloadLinkTesting": "https://github.com/xivdev/Penumbra/releases/download/1.5.1.11/Penumbra.zip",
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"DownloadLinkUpdate": "https://github.com/xivdev/Penumbra/releases/download/1.5.1.11/Penumbra.zip",
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"DownloadLinkInstall": "https://github.com/xivdev/Penumbra/releases/download/1.5.1.13/Penumbra.zip",
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"DownloadLinkTesting": "https://github.com/xivdev/Penumbra/releases/download/1.5.1.13/Penumbra.zip",
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"DownloadLinkUpdate": "https://github.com/xivdev/Penumbra/releases/download/1.5.1.13/Penumbra.zip",
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"IconUrl": "https://raw.githubusercontent.com/xivdev/Penumbra/master/images/icon.png"
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}
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]
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