Merge pull request #12237 from liamwhite/nce-sigtrap

nce: implement instruction emulation for misaligned memory accesses

src/android/app/build.gradle.kts

@@ -174,7 +174,8 @@ android {
                     "-DANDROID_ARM_NEON=true", // cryptopp requires Neon to work
                     "-DYUZU_USE_BUNDLED_VCPKG=ON",
                     "-DYUZU_USE_BUNDLED_FFMPEG=ON",
-                    "-DYUZU_ENABLE_LTO=ON"
+                    "-DYUZU_ENABLE_LTO=ON",
+                    "-DCMAKE_EXPORT_COMPILE_COMMANDS=ON"
                 )
 
                 abiFilters("arm64-v8a", "x86_64")

src/core/CMakeLists.txt

@@ -953,15 +953,19 @@ if (HAS_NCE)
     set(CMAKE_ASM_FLAGS "${CFLAGS} -x assembler-with-cpp")
 
     target_sources(core PRIVATE
+        arm/nce/arm_nce_asm_definitions.h
         arm/nce/arm_nce.cpp
         arm/nce/arm_nce.h
         arm/nce/arm_nce.s
         arm/nce/guest_context.h
+        arm/nce/instructions.h
+        arm/nce/interpreter_visitor.cpp
+        arm/nce/interpreter_visitor.h
         arm/nce/patcher.cpp
         arm/nce/patcher.h
-        arm/nce/instructions.h
+        arm/nce/visitor_base.h
     )
-    target_link_libraries(core PRIVATE merry::oaknut)
+    target_link_libraries(core PRIVATE merry::mcl merry::oaknut)
 endif()
 
 if (ARCHITECTURE_x86_64 OR ARCHITECTURE_arm64)

src/core/arm/nce/arm_nce.cpp

@@ -6,7 +6,7 @@
 
 #include "common/signal_chain.h"
 #include "core/arm/nce/arm_nce.h"
-#include "core/arm/nce/guest_context.h"
+#include "core/arm/nce/interpreter_visitor.h"
 #include "core/arm/nce/patcher.h"
 #include "core/core.h"
 #include "core/memory.h"
@@ -21,7 +21,8 @@ namespace Core {
 
 namespace {
 
-struct sigaction g_orig_action;
+struct sigaction g_orig_bus_action;
+struct sigaction g_orig_segv_action;
 
 // Verify assembly offsets.
 using NativeExecutionParameters = Kernel::KThread::NativeExecutionParameters;
@@ -37,6 +38,9 @@ fpsimd_context* GetFloatingPointState(mcontext_t& host_ctx) {
     return reinterpret_cast<fpsimd_context*>(header);
 }
 
+using namespace Common::Literals;
+constexpr u32 StackSize = 32_KiB;
+
 } // namespace
 
 void* ArmNce::RestoreGuestContext(void* raw_context) {
@@ -104,19 +108,10 @@ void ArmNce::SaveGuestContext(GuestContext* guest_ctx, void* raw_context) {
     host_ctx.regs[0] = guest_ctx->esr_el1.exchange(0);
 }
 
-bool ArmNce::HandleGuestFault(GuestContext* guest_ctx, void* raw_info, void* raw_context) {
+bool ArmNce::HandleFailedGuestFault(GuestContext* guest_ctx, void* raw_info, void* raw_context) {
     auto& host_ctx = static_cast<ucontext_t*>(raw_context)->uc_mcontext;
     auto* info = static_cast<siginfo_t*>(raw_info);
 
-    // Try to handle an invalid access.
-    // TODO: handle accesses which split a page?
-    const Common::ProcessAddress addr =
-        (reinterpret_cast<u64>(info->si_addr) & ~Memory::YUZU_PAGEMASK);
-    if (guest_ctx->system->ApplicationMemory().InvalidateNCE(addr, Memory::YUZU_PAGESIZE)) {
-        // We handled the access successfully and are returning to guest code.
-        return true;
-    }
-
     // We can't handle the access, so determine why we crashed.
     const bool is_prefetch_abort = host_ctx.pc == reinterpret_cast<u64>(info->si_addr);
 
@@ -143,8 +138,44 @@ bool ArmNce::HandleGuestFault(GuestContext* guest_ctx, void* raw_info, void* raw
     return false;
 }
 
-void ArmNce::HandleHostFault(int sig, void* raw_info, void* raw_context) {
+bool ArmNce::HandleGuestAlignmentFault(GuestContext* guest_ctx, void* raw_info, void* raw_context) {
-    return g_orig_action.sa_sigaction(sig, static_cast<siginfo_t*>(raw_info), raw_context);
+    auto& host_ctx = static_cast<ucontext_t*>(raw_context)->uc_mcontext;
+    auto* fpctx = GetFloatingPointState(host_ctx);
+    auto& memory = guest_ctx->system->ApplicationMemory();
+
+    // Match and execute an instruction.
+    auto next_pc = MatchAndExecuteOneInstruction(memory, &host_ctx, fpctx);
+    if (next_pc) {
+        host_ctx.pc = *next_pc;
+        return true;
+    }
+
+    // We couldn't handle the access.
+    return HandleFailedGuestFault(guest_ctx, raw_info, raw_context);
+}
+
+bool ArmNce::HandleGuestAccessFault(GuestContext* guest_ctx, void* raw_info, void* raw_context) {
+    auto* info = static_cast<siginfo_t*>(raw_info);
+
+    // Try to handle an invalid access.
+    // TODO: handle accesses which split a page?
+    const Common::ProcessAddress addr =
+        (reinterpret_cast<u64>(info->si_addr) & ~Memory::YUZU_PAGEMASK);
+    if (guest_ctx->system->ApplicationMemory().InvalidateNCE(addr, Memory::YUZU_PAGESIZE)) {
+        // We handled the access successfully and are returning to guest code.
+        return true;
+    }
+
+    // We couldn't handle the access.
+    return HandleFailedGuestFault(guest_ctx, raw_info, raw_context);
+}
+
+void ArmNce::HandleHostAlignmentFault(int sig, void* raw_info, void* raw_context) {
+    return g_orig_bus_action.sa_sigaction(sig, static_cast<siginfo_t*>(raw_info), raw_context);
+}
+
+void ArmNce::HandleHostAccessFault(int sig, void* raw_info, void* raw_context) {
+    return g_orig_segv_action.sa_sigaction(sig, static_cast<siginfo_t*>(raw_info), raw_context);
 }
 
 void ArmNce::LockThread(Kernel::KThread* thread) {
@@ -225,18 +256,31 @@ ArmNce::ArmNce(System& system, bool uses_wall_clock, std::size_t core_index)
 ArmNce::~ArmNce() = default;
 
 void ArmNce::Initialize() {
+    if (m_thread_id == -1) {
         m_thread_id = gettid();
+    }
 
-    // Setup our signals
+    // Configure signal stack.
-    static std::once_flag signals;
+    if (!m_stack) {
-    std::call_once(signals, [] {
+        m_stack = std::make_unique<u8[]>(StackSize);
+
+        stack_t ss{};
+        ss.ss_sp = m_stack.get();
+        ss.ss_size = StackSize;
+        sigaltstack(&ss, nullptr);
+    }
+
+    // Set up signals.
+    static std::once_flag flag;
+    std::call_once(flag, [] {
         using HandlerType = decltype(sigaction::sa_sigaction);
 
         sigset_t signal_mask;
         sigemptyset(&signal_mask);
         sigaddset(&signal_mask, ReturnToRunCodeByExceptionLevelChangeSignal);
         sigaddset(&signal_mask, BreakFromRunCodeSignal);
-        sigaddset(&signal_mask, GuestFaultSignal);
+        sigaddset(&signal_mask, GuestAlignmentFaultSignal);
+        sigaddset(&signal_mask, GuestAccessFaultSignal);
 
         struct sigaction return_to_run_code_action {};
         return_to_run_code_action.sa_flags = SA_SIGINFO | SA_ONSTACK;
@@ -253,18 +297,19 @@ void ArmNce::Initialize() {
         break_from_run_code_action.sa_mask = signal_mask;
         Common::SigAction(BreakFromRunCodeSignal, &break_from_run_code_action, nullptr);
 
-        struct sigaction fault_action {};
+        struct sigaction alignment_fault_action {};
-        fault_action.sa_flags = SA_SIGINFO | SA_ONSTACK | SA_RESTART;
+        alignment_fault_action.sa_flags = SA_SIGINFO | SA_ONSTACK;
-        fault_action.sa_sigaction = reinterpret_cast<HandlerType>(&ArmNce::GuestFaultSignalHandler);
+        alignment_fault_action.sa_sigaction =
-        fault_action.sa_mask = signal_mask;
+            reinterpret_cast<HandlerType>(&ArmNce::GuestAlignmentFaultSignalHandler);
-        Common::SigAction(GuestFaultSignal, &fault_action, &g_orig_action);
+        alignment_fault_action.sa_mask = signal_mask;
+        Common::SigAction(GuestAlignmentFaultSignal, &alignment_fault_action, nullptr);
 
-        // Simplify call for g_orig_action.
+        struct sigaction access_fault_action {};
-        // These fields occupy the same space in memory, so this should be a no-op in practice.
+        access_fault_action.sa_flags = SA_SIGINFO | SA_ONSTACK | SA_RESTART;
-        if (!(g_orig_action.sa_flags & SA_SIGINFO)) {
+        access_fault_action.sa_sigaction =
-            g_orig_action.sa_sigaction =
+            reinterpret_cast<HandlerType>(&ArmNce::GuestAccessFaultSignalHandler);
-                reinterpret_cast<decltype(g_orig_action.sa_sigaction)>(g_orig_action.sa_handler);
+        access_fault_action.sa_mask = signal_mask;
-        }
+        Common::SigAction(GuestAccessFaultSignal, &access_fault_action, &g_orig_segv_action);
     });
 }
 

src/core/arm/nce/arm_nce.h

@@ -61,7 +61,8 @@ private:
     static void ReturnToRunCodeByExceptionLevelChangeSignalHandler(int sig, void* info,
                                                                    void* raw_context);
     static void BreakFromRunCodeSignalHandler(int sig, void* info, void* raw_context);
-    static void GuestFaultSignalHandler(int sig, void* info, void* raw_context);
+    static void GuestAlignmentFaultSignalHandler(int sig, void* info, void* raw_context);
+    static void GuestAccessFaultSignalHandler(int sig, void* info, void* raw_context);
 
     static void LockThreadParameters(void* tpidr);
     static void UnlockThreadParameters(void* tpidr);
@@ -70,8 +71,11 @@ private:
     // C++ implementation functions for assembly definitions.
     static void* RestoreGuestContext(void* raw_context);
     static void SaveGuestContext(GuestContext* ctx, void* raw_context);
-    static bool HandleGuestFault(GuestContext* ctx, void* info, void* raw_context);
+    static bool HandleFailedGuestFault(GuestContext* ctx, void* info, void* raw_context);
-    static void HandleHostFault(int sig, void* info, void* raw_context);
+    static bool HandleGuestAlignmentFault(GuestContext* ctx, void* info, void* raw_context);
+    static bool HandleGuestAccessFault(GuestContext* ctx, void* info, void* raw_context);
+    static void HandleHostAlignmentFault(int sig, void* info, void* raw_context);
+    static void HandleHostAccessFault(int sig, void* info, void* raw_context);
 
 public:
     Core::System& m_system;
@@ -83,6 +87,9 @@ public:
     // Core context.
     GuestContext m_guest_ctx{};
     Kernel::KThread* m_running_thread{};
+
+    // Stack for signal processing.
+    std::unique_ptr<u8[]> m_stack{};
 };
 
 } // namespace Core

src/core/arm/nce/arm_nce.s

@@ -130,11 +130,11 @@ _ZN4Core6ArmNce29BreakFromRunCodeSignalHandlerEiPvS1_:
     ret
 
 
-/* static void Core::ArmNce::GuestFaultSignalHandler(int sig, void* info, void* raw_context) */
+/* static void Core::ArmNce::GuestAlignmentFaultSignalHandler(int sig, void* info, void* raw_context) */
-.section    .text._ZN4Core6ArmNce23GuestFaultSignalHandlerEiPvS1_, "ax", %progbits
+.section    .text._ZN4Core6ArmNce32GuestAlignmentFaultSignalHandlerEiPvS1_, "ax", %progbits
-.global     _ZN4Core6ArmNce23GuestFaultSignalHandlerEiPvS1_
+.global     _ZN4Core6ArmNce32GuestAlignmentFaultSignalHandlerEiPvS1_
-.type       _ZN4Core6ArmNce23GuestFaultSignalHandlerEiPvS1_, %function
+.type       _ZN4Core6ArmNce32GuestAlignmentFaultSignalHandlerEiPvS1_, %function
-_ZN4Core6ArmNce23GuestFaultSignalHandlerEiPvS1_:
+_ZN4Core6ArmNce32GuestAlignmentFaultSignalHandlerEiPvS1_:
     /* Check to see if we have the correct TLS magic. */
     mrs     x8, tpidr_el0
     ldr     w9, [x8, #(TpidrEl0TlsMagic)]
@@ -146,7 +146,7 @@ _ZN4Core6ArmNce23GuestFaultSignalHandlerEiPvS1_:
 
     /* Incorrect TLS magic, so this is a host fault. */
     /* Tail call the handler. */
-    b       _ZN4Core6ArmNce15HandleHostFaultEiPvS1_
+    b       _ZN4Core6ArmNce24HandleHostAlignmentFaultEiPvS1_
 
 1:
     /* Correct TLS magic, so this is a guest fault. */
@@ -163,7 +163,53 @@ _ZN4Core6ArmNce23GuestFaultSignalHandlerEiPvS1_:
     msr     tpidr_el0, x3
 
     /* Call the handler. */
-    bl       _ZN4Core6ArmNce16HandleGuestFaultEPNS_12GuestContextEPvS3_
+    bl       _ZN4Core6ArmNce25HandleGuestAlignmentFaultEPNS_12GuestContextEPvS3_
+
+    /* If the handler returned false, we want to preserve the host tpidr_el0. */
+    cbz     x0, 2f
+
+    /* Otherwise, restore guest tpidr_el0. */
+    msr     tpidr_el0, x19
+
+2:
+    ldr     x19, [sp, #0x10]
+    ldp     x29, x30, [sp], #0x20
+    ret
+
+/* static void Core::ArmNce::GuestAccessFaultSignalHandler(int sig, void* info, void* raw_context) */
+.section    .text._ZN4Core6ArmNce29GuestAccessFaultSignalHandlerEiPvS1_, "ax", %progbits
+.global     _ZN4Core6ArmNce29GuestAccessFaultSignalHandlerEiPvS1_
+.type       _ZN4Core6ArmNce29GuestAccessFaultSignalHandlerEiPvS1_, %function
+_ZN4Core6ArmNce29GuestAccessFaultSignalHandlerEiPvS1_:
+    /* Check to see if we have the correct TLS magic. */
+    mrs     x8, tpidr_el0
+    ldr     w9, [x8, #(TpidrEl0TlsMagic)]
+
+    LOAD_IMMEDIATE_32(w10, TlsMagic)
+
+    cmp     w9, w10
+    b.eq    1f
+
+    /* Incorrect TLS magic, so this is a host fault. */
+    /* Tail call the handler. */
+    b       _ZN4Core6ArmNce21HandleHostAccessFaultEiPvS1_
+
+1:
+    /* Correct TLS magic, so this is a guest fault. */
+    stp     x29, x30, [sp, #-0x20]!
+    str     x19, [sp, #0x10]
+    mov     x29, sp
+
+    /* Save the old tpidr_el0. */
+    mov     x19, x8
+
+    /* Restore host tpidr_el0. */
+    ldr     x0, [x8, #(TpidrEl0NativeContext)]
+    ldr     x3, [x0, #(GuestContextHostContext + HostContextTpidrEl0)]
+    msr     tpidr_el0, x3
+
+    /* Call the handler. */
+    bl       _ZN4Core6ArmNce22HandleGuestAccessFaultEPNS_12GuestContextEPvS3_
 
     /* If the handler returned false, we want to preserve the host tpidr_el0. */
     cbz     x0, 2f

src/core/arm/nce/arm_nce_asm_definitions.h

@@ -10,7 +10,8 @@
 
 #define ReturnToRunCodeByExceptionLevelChangeSignal SIGUSR2
 #define BreakFromRunCodeSignal SIGURG
-#define GuestFaultSignal SIGSEGV
+#define GuestAccessFaultSignal SIGSEGV
+#define GuestAlignmentFaultSignal SIGBUS
 
 #define GuestContextSp 0xF8
 #define GuestContextHostContext 0x320

src/core/arm/nce/interpreter_visitor.cpp

@@ -0,0 +1,825 @@
+// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
+// SPDX-FileCopyrightText: Copyright 2023 merryhime <https://mary.rs>
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "common/bit_cast.h"
+#include "core/arm/nce/interpreter_visitor.h"
+
+#include <dynarmic/frontend/A64/decoder/a64.h>
+
+namespace Core {
+
+template <u32 BitSize>
+u64 SignExtendToLong(u64 value) {
+    u64 mask = 1ULL << (BitSize - 1);
+    value &= (1ULL << BitSize) - 1;
+    return (value ^ mask) - mask;
+}
+
+static u64 SignExtendToLong(u64 value, u64 bitsize) {
+    switch (bitsize) {
+    case 8:
+        return SignExtendToLong<8>(value);
+    case 16:
+        return SignExtendToLong<16>(value);
+    case 32:
+        return SignExtendToLong<32>(value);
+    default:
+        return value;
+    }
+}
+
+template <u64 BitSize>
+u32 SignExtendToWord(u32 value) {
+    u32 mask = 1ULL << (BitSize - 1);
+    value &= (1ULL << BitSize) - 1;
+    return (value ^ mask) - mask;
+}
+
+static u32 SignExtendToWord(u32 value, u64 bitsize) {
+    switch (bitsize) {
+    case 8:
+        return SignExtendToWord<8>(value);
+    case 16:
+        return SignExtendToWord<16>(value);
+    default:
+        return value;
+    }
+}
+
+static u64 SignExtend(u64 value, u64 bitsize, u64 regsize) {
+    if (regsize == 64) {
+        return SignExtendToLong(value, bitsize);
+    } else {
+        return SignExtendToWord(static_cast<u32>(value), bitsize);
+    }
+}
+
+static u128 VectorGetElement(u128 value, u64 bitsize) {
+    switch (bitsize) {
+    case 8:
+        return {value[0] & ((1ULL << 8) - 1), 0};
+    case 16:
+        return {value[0] & ((1ULL << 16) - 1), 0};
+    case 32:
+        return {value[0] & ((1ULL << 32) - 1), 0};
+    case 64:
+        return {value[0], 0};
+    default:
+        return value;
+    }
+}
+
+u64 InterpreterVisitor::ExtendReg(size_t bitsize, Reg reg, Imm<3> option, u8 shift) {
+    ASSERT(shift <= 4);
+    ASSERT(bitsize == 32 || bitsize == 64);
+    u64 val = this->GetReg(reg);
+    size_t len;
+    u64 extended;
+    bool signed_extend;
+
+    switch (option.ZeroExtend()) {
+    case 0b000: { // UXTB
+        val &= ((1ULL << 8) - 1);
+        len = 8;
+        signed_extend = false;
+        break;
+    }
+    case 0b001: { // UXTH
+        val &= ((1ULL << 16) - 1);
+        len = 16;
+        signed_extend = false;
+        break;
+    }
+    case 0b010: { // UXTW
+        val &= ((1ULL << 32) - 1);
+        len = 32;
+        signed_extend = false;
+        break;
+    }
+    case 0b011: { // UXTX
+        len = 64;
+        signed_extend = false;
+        break;
+    }
+    case 0b100: { // SXTB
+        val &= ((1ULL << 8) - 1);
+        len = 8;
+        signed_extend = true;
+        break;
+    }
+    case 0b101: { // SXTH
+        val &= ((1ULL << 16) - 1);
+        len = 16;
+        signed_extend = true;
+        break;
+    }
+    case 0b110: { // SXTW
+        val &= ((1ULL << 32) - 1);
+        len = 32;
+        signed_extend = true;
+        break;
+    }
+    case 0b111: { // SXTX
+        len = 64;
+        signed_extend = true;
+        break;
+    }
+    default:
+        UNREACHABLE();
+    }
+
+    if (len < bitsize && signed_extend) {
+        extended = SignExtend(val, len, bitsize);
+    } else {
+        extended = val;
+    }
+
+    return extended << shift;
+}
+
+u128 InterpreterVisitor::GetVec(Vec v) {
+    return m_fpsimd_regs[static_cast<u32>(v)];
+}
+
+u64 InterpreterVisitor::GetReg(Reg r) {
+    return m_regs[static_cast<u32>(r)];
+}
+
+u64 InterpreterVisitor::GetSp() {
+    return m_sp;
+}
+
+u64 InterpreterVisitor::GetPc() {
+    return m_pc;
+}
+
+void InterpreterVisitor::SetVec(Vec v, u128 value) {
+    m_fpsimd_regs[static_cast<u32>(v)] = value;
+}
+
+void InterpreterVisitor::SetReg(Reg r, u64 value) {
+    m_regs[static_cast<u32>(r)] = value;
+}
+
+void InterpreterVisitor::SetSp(u64 value) {
+    m_sp = value;
+}
+
+bool InterpreterVisitor::Ordered(size_t size, bool L, bool o0, Reg Rn, Reg Rt) {
+    const auto memop = L ? MemOp::Load : MemOp::Store;
+    const size_t elsize = 8 << size;
+    const size_t datasize = elsize;
+
+    // Operation
+    const size_t dbytes = datasize / 8;
+
+    u64 address;
+    if (Rn == Reg::SP) {
+        address = this->GetSp();
+    } else {
+        address = this->GetReg(Rn);
+    }
+
+    switch (memop) {
+    case MemOp::Store: {
+        std::atomic_thread_fence(std::memory_order_seq_cst);
+        u64 value = this->GetReg(Rt);
+        m_memory.WriteBlock(address, &value, dbytes);
+        std::atomic_thread_fence(std::memory_order_seq_cst);
+        break;
+    }
+    case MemOp::Load: {
+        u64 value = 0;
+        m_memory.ReadBlock(address, &value, dbytes);
+        this->SetReg(Rt, value);
+        std::atomic_thread_fence(std::memory_order_seq_cst);
+        break;
+    }
+    default:
+        UNREACHABLE();
+    }
+
+    return true;
+}
+
+bool InterpreterVisitor::STLLR(Imm<2> sz, Reg Rn, Reg Rt) {
+    const size_t size = sz.ZeroExtend<size_t>();
+    const bool L = 0;
+    const bool o0 = 0;
+    return this->Ordered(size, L, o0, Rn, Rt);
+}
+
+bool InterpreterVisitor::STLR(Imm<2> sz, Reg Rn, Reg Rt) {
+    const size_t size = sz.ZeroExtend<size_t>();
+    const bool L = 0;
+    const bool o0 = 1;
+    return this->Ordered(size, L, o0, Rn, Rt);
+}
+
+bool InterpreterVisitor::LDLAR(Imm<2> sz, Reg Rn, Reg Rt) {
+    const size_t size = sz.ZeroExtend<size_t>();
+    const bool L = 1;
+    const bool o0 = 0;
+    return this->Ordered(size, L, o0, Rn, Rt);
+}
+
+bool InterpreterVisitor::LDAR(Imm<2> sz, Reg Rn, Reg Rt) {
+    const size_t size = sz.ZeroExtend<size_t>();
+    const bool L = 1;
+    const bool o0 = 1;
+    return this->Ordered(size, L, o0, Rn, Rt);
+}
+
+bool InterpreterVisitor::LDR_lit_gen(bool opc_0, Imm<19> imm19, Reg Rt) {
+    const size_t size = opc_0 == 0 ? 4 : 8;
+    const s64 offset = Dynarmic::concatenate(imm19, Imm<2>{0}).SignExtend<s64>();
+    const u64 address = this->GetPc() + offset;
+
+    u64 data = 0;
+    m_memory.ReadBlock(address, &data, size);
+
+    this->SetReg(Rt, data);
+    return true;
+}
+
+bool InterpreterVisitor::LDR_lit_fpsimd(Imm<2> opc, Imm<19> imm19, Vec Vt) {
+    if (opc == 0b11) {
+        // Unallocated encoding
+        return false;
+    }
+
+    const u64 size = 4 << opc.ZeroExtend();
+    const u64 offset = imm19.SignExtend<u64>() << 2;
+    const u64 address = this->GetPc() + offset;
+
+    u128 data{};
+    m_memory.ReadBlock(address, &data, size);
+    this->SetVec(Vt, data);
+    return true;
+}
+
+bool InterpreterVisitor::STP_LDP_gen(Imm<2> opc, bool not_postindex, bool wback, Imm<1> L,
+                                     Imm<7> imm7, Reg Rt2, Reg Rn, Reg Rt) {
+    if ((L == 0 && opc.Bit<0>() == 1) || opc == 0b11) {
+        // Unallocated encoding
+        return false;
+    }
+
+    const auto memop = L == 1 ? MemOp::Load : MemOp::Store;
+    if (memop == MemOp::Load && wback && (Rt == Rn || Rt2 == Rn) && Rn != Reg::R31) {
+        // Unpredictable instruction
+        return false;
+    }
+    if (memop == MemOp::Store && wback && (Rt == Rn || Rt2 == Rn) && Rn != Reg::R31) {
+        // Unpredictable instruction
+        return false;
+    }
+    if (memop == MemOp::Load && Rt == Rt2) {
+        // Unpredictable instruction
+        return false;
+    }
+
+    u64 address;
+    if (Rn == Reg::SP) {
+        address = this->GetSp();
+    } else {
+        address = this->GetReg(Rn);
+    }
+
+    const bool postindex = !not_postindex;
+    const bool signed_ = opc.Bit<0>() != 0;
+    const size_t scale = 2 + opc.Bit<1>();
+    const size_t datasize = 8 << scale;
+    const u64 offset = imm7.SignExtend<u64>() << scale;
+
+    if (!postindex) {
+        address += offset;
+    }
+
+    const size_t dbytes = datasize / 8;
+    switch (memop) {
+    case MemOp::Store: {
+        u64 data1 = this->GetReg(Rt);
+        u64 data2 = this->GetReg(Rt2);
+        m_memory.WriteBlock(address, &data1, dbytes);
+        m_memory.WriteBlock(address + dbytes, &data2, dbytes);
+        break;
+    }
+    case MemOp::Load: {
+        u64 data1 = 0, data2 = 0;
+        m_memory.ReadBlock(address, &data1, dbytes);
+        m_memory.ReadBlock(address + dbytes, &data2, dbytes);
+        if (signed_) {
+            this->SetReg(Rt, SignExtend(data1, datasize, 64));
+            this->SetReg(Rt2, SignExtend(data2, datasize, 64));
+        } else {
+            this->SetReg(Rt, data1);
+            this->SetReg(Rt2, data2);
+        }
+        break;
+    }
+    default:
+        UNREACHABLE();
+    }
+
+    if (wback) {
+        if (postindex) {
+            address += offset;
+        }
+
+        if (Rn == Reg::SP) {
+            this->SetSp(address);
+        } else {
+            this->SetReg(Rn, address);
+        }
+    }
+
+    return true;
+}
+
+bool InterpreterVisitor::STP_LDP_fpsimd(Imm<2> opc, bool not_postindex, bool wback, Imm<1> L,
+                                        Imm<7> imm7, Vec Vt2, Reg Rn, Vec Vt) {
+    if (opc == 0b11) {
+        // Unallocated encoding
+        return false;
+    }
+
+    const auto memop = L == 1 ? MemOp::Load : MemOp::Store;
+    if (memop == MemOp::Load && Vt == Vt2) {
+        // Unpredictable instruction
+        return false;
+    }
+
+    u64 address;
+    if (Rn == Reg::SP) {
+        address = this->GetSp();
+    } else {
+        address = this->GetReg(Rn);
+    }
+
+    const bool postindex = !not_postindex;
+    const size_t scale = 2 + opc.ZeroExtend<size_t>();
+    const size_t datasize = 8 << scale;
+    const u64 offset = imm7.SignExtend<u64>() << scale;
+    const size_t dbytes = datasize / 8;
+
+    if (!postindex) {
+        address += offset;
+    }
+
+    switch (memop) {
+    case MemOp::Store: {
+        u128 data1 = VectorGetElement(this->GetVec(Vt), datasize);
+        u128 data2 = VectorGetElement(this->GetVec(Vt2), datasize);
+        m_memory.WriteBlock(address, &data1, dbytes);
+        m_memory.WriteBlock(address + dbytes, &data2, dbytes);
+        break;
+    }
+    case MemOp::Load: {
+        u128 data1{}, data2{};
+        m_memory.ReadBlock(address, &data1, dbytes);
+        m_memory.ReadBlock(address + dbytes, &data2, dbytes);
+        this->SetVec(Vt, data1);
+        this->SetVec(Vt2, data2);
+        break;
+    }
+    default:
+        UNREACHABLE();
+    }
+
+    if (wback) {
+        if (postindex) {
+            address += offset;
+        }
+
+        if (Rn == Reg::SP) {
+            this->SetSp(address);
+        } else {
+            this->SetReg(Rn, address);
+        }
+    }
+
+    return true;
+}
+
+bool InterpreterVisitor::RegisterImmediate(bool wback, bool postindex, size_t scale, u64 offset,
+                                           Imm<2> size, Imm<2> opc, Reg Rn, Reg Rt) {
+    MemOp memop;
+    bool signed_ = false;
+    size_t regsize = 0;
+
+    if (opc.Bit<1>() == 0) {
+        memop = opc.Bit<0>() ? MemOp::Load : MemOp::Store;
+        regsize = size == 0b11 ? 64 : 32;
+        signed_ = false;
+    } else if (size == 0b11) {
+        memop = MemOp::Prefetch;
+        ASSERT(!opc.Bit<0>());
+    } else {
+        memop = MemOp::Load;
+        ASSERT(!(size == 0b10 && opc.Bit<0>() == 1));
+        regsize = opc.Bit<0>() ? 32 : 64;
+        signed_ = true;
+    }
+
+    if (memop == MemOp::Load && wback && Rn == Rt && Rn != Reg::R31) {
+        // Unpredictable instruction
+        return false;
+    }
+    if (memop == MemOp::Store && wback && Rn == Rt && Rn != Reg::R31) {
+        // Unpredictable instruction
+        return false;
+    }
+
+    u64 address;
+    if (Rn == Reg::SP) {
+        address = this->GetSp();
+    } else {
+        address = this->GetReg(Rn);
+    }
+    if (!postindex) {
+        address += offset;
+    }
+
+    const size_t datasize = 8 << scale;
+    switch (memop) {
+    case MemOp::Store: {
+        u64 data = this->GetReg(Rt);
+        m_memory.WriteBlock(address, &data, datasize / 8);
+        break;
+    }
+    case MemOp::Load: {
+        u64 data = 0;
+        m_memory.ReadBlock(address, &data, datasize / 8);
+        if (signed_) {
+            this->SetReg(Rt, SignExtend(data, datasize, regsize));
+        } else {
+            this->SetReg(Rt, data);
+        }
+        break;
+    }
+    case MemOp::Prefetch:
+        // this->Prefetch(address, Rt)
+        break;
+    }
+
+    if (wback) {
+        if (postindex) {
+            address += offset;
+        }
+
+        if (Rn == Reg::SP) {
+            this->SetSp(address);
+        } else {
+            this->SetReg(Rn, address);
+        }
+    }
+
+    return true;
+}
+
+bool InterpreterVisitor::STRx_LDRx_imm_1(Imm<2> size, Imm<2> opc, Imm<9> imm9, bool not_postindex,
+                                         Reg Rn, Reg Rt) {
+    const bool wback = true;
+    const bool postindex = !not_postindex;
+    const size_t scale = size.ZeroExtend<size_t>();
+    const u64 offset = imm9.SignExtend<u64>();
+
+    return this->RegisterImmediate(wback, postindex, scale, offset, size, opc, Rn, Rt);
+}
+
+bool InterpreterVisitor::STRx_LDRx_imm_2(Imm<2> size, Imm<2> opc, Imm<12> imm12, Reg Rn, Reg Rt) {
+    const bool wback = false;
+    const bool postindex = false;
+    const size_t scale = size.ZeroExtend<size_t>();
+    const u64 offset = imm12.ZeroExtend<u64>() << scale;
+
+    return this->RegisterImmediate(wback, postindex, scale, offset, size, opc, Rn, Rt);
+}
+
+bool InterpreterVisitor::STURx_LDURx(Imm<2> size, Imm<2> opc, Imm<9> imm9, Reg Rn, Reg Rt) {
+    const bool wback = false;
+    const bool postindex = false;
+    const size_t scale = size.ZeroExtend<size_t>();
+    const u64 offset = imm9.SignExtend<u64>();
+
+    return this->RegisterImmediate(wback, postindex, scale, offset, size, opc, Rn, Rt);
+}
+
+bool InterpreterVisitor::SIMDImmediate(bool wback, bool postindex, size_t scale, u64 offset,
+                                       MemOp memop, Reg Rn, Vec Vt) {
+    const size_t datasize = 8 << scale;
+
+    u64 address;
+    if (Rn == Reg::SP) {
+        address = this->GetSp();
+    } else {
+        address = this->GetReg(Rn);
+    }
+
+    if (!postindex) {
+        address += offset;
+    }
+
+    switch (memop) {
+    case MemOp::Store: {
+        u128 data = VectorGetElement(this->GetVec(Vt), datasize);
+        m_memory.WriteBlock(address, &data, datasize / 8);
+        break;
+    }
+    case MemOp::Load: {
+        u128 data{};
+        m_memory.ReadBlock(address, &data, datasize);
+        this->SetVec(Vt, data);
+        break;
+    }
+    default:
+        UNREACHABLE();
+    }
+
+    if (wback) {
+        if (postindex) {
+            address += offset;
+        }
+
+        if (Rn == Reg::SP) {
+            this->SetSp(address);
+        } else {
+            this->SetReg(Rn, address);
+        }
+    }
+
+    return true;
+}
+
+bool InterpreterVisitor::STR_imm_fpsimd_1(Imm<2> size, Imm<1> opc_1, Imm<9> imm9,
+                                          bool not_postindex, Reg Rn, Vec Vt) {
+    const size_t scale = Dynarmic::concatenate(opc_1, size).ZeroExtend<size_t>();
+    if (scale > 4) {
+        // Unallocated encoding
+        return false;
+    }
+
+    const bool wback = true;
+    const bool postindex = !not_postindex;
+    const u64 offset = imm9.SignExtend<u64>();
+
+    return this->SIMDImmediate(wback, postindex, scale, offset, MemOp::Store, Rn, Vt);
+}
+
+bool InterpreterVisitor::STR_imm_fpsimd_2(Imm<2> size, Imm<1> opc_1, Imm<12> imm12, Reg Rn,
+                                          Vec Vt) {
+    const size_t scale = Dynarmic::concatenate(opc_1, size).ZeroExtend<size_t>();
+    if (scale > 4) {
+        // Unallocated encoding
+        return false;
+    }
+
+    const bool wback = false;
+    const bool postindex = false;
+    const u64 offset = imm12.ZeroExtend<u64>() << scale;
+
+    return this->SIMDImmediate(wback, postindex, scale, offset, MemOp::Store, Rn, Vt);
+}
+
+bool InterpreterVisitor::LDR_imm_fpsimd_1(Imm<2> size, Imm<1> opc_1, Imm<9> imm9,
+                                          bool not_postindex, Reg Rn, Vec Vt) {
+    const size_t scale = Dynarmic::concatenate(opc_1, size).ZeroExtend<size_t>();
+    if (scale > 4) {
+        // Unallocated encoding
+        return false;
+    }
+
+    const bool wback = true;
+    const bool postindex = !not_postindex;
+    const u64 offset = imm9.SignExtend<u64>();
+
+    return this->SIMDImmediate(wback, postindex, scale, offset, MemOp::Load, Rn, Vt);
+}
+
+bool InterpreterVisitor::LDR_imm_fpsimd_2(Imm<2> size, Imm<1> opc_1, Imm<12> imm12, Reg Rn,
+                                          Vec Vt) {
+    const size_t scale = Dynarmic::concatenate(opc_1, size).ZeroExtend<size_t>();
+    if (scale > 4) {
+        // Unallocated encoding
+        return false;
+    }
+
+    const bool wback = false;
+    const bool postindex = false;
+    const u64 offset = imm12.ZeroExtend<u64>() << scale;
+
+    return this->SIMDImmediate(wback, postindex, scale, offset, MemOp::Load, Rn, Vt);
+}
+
+bool InterpreterVisitor::STUR_fpsimd(Imm<2> size, Imm<1> opc_1, Imm<9> imm9, Reg Rn, Vec Vt) {
+    const size_t scale = Dynarmic::concatenate(opc_1, size).ZeroExtend<size_t>();
+    if (scale > 4) {
+        // Unallocated encoding
+        return false;
+    }
+
+    const bool wback = false;
+    const bool postindex = false;
+    const u64 offset = imm9.SignExtend<u64>();
+
+    return this->SIMDImmediate(wback, postindex, scale, offset, MemOp::Store, Rn, Vt);
+}
+
+bool InterpreterVisitor::LDUR_fpsimd(Imm<2> size, Imm<1> opc_1, Imm<9> imm9, Reg Rn, Vec Vt) {
+    const size_t scale = Dynarmic::concatenate(opc_1, size).ZeroExtend<size_t>();
+    if (scale > 4) {
+        // Unallocated encoding
+        return false;
+    }
+
+    const bool wback = false;
+    const bool postindex = false;
+    const u64 offset = imm9.SignExtend<u64>();
+
+    return this->SIMDImmediate(wback, postindex, scale, offset, MemOp::Load, Rn, Vt);
+}
+
+bool InterpreterVisitor::RegisterOffset(size_t scale, u8 shift, Imm<2> size, Imm<1> opc_1,
+                                        Imm<1> opc_0, Reg Rm, Imm<3> option, Reg Rn, Reg Rt) {
+    MemOp memop;
+    size_t regsize = 64;
+    bool signed_ = false;
+
+    if (opc_1 == 0) {
+        memop = opc_0 == 1 ? MemOp::Load : MemOp::Store;
+        regsize = size == 0b11 ? 64 : 32;
+        signed_ = false;
+    } else if (size == 0b11) {
+        memop = MemOp::Prefetch;
+        if (opc_0 == 1) {
+            // Unallocated encoding
+            return false;
+        }
+    } else {
+        memop = MemOp::Load;
+        if (size == 0b10 && opc_0 == 1) {
+            // Unallocated encoding
+            return false;
+        }
+        regsize = opc_0 == 1 ? 32 : 64;
+        signed_ = true;
+    }
+
+    const size_t datasize = 8 << scale;
+
+    // Operation
+    const u64 offset = this->ExtendReg(64, Rm, option, shift);
+
+    u64 address;
+    if (Rn == Reg::SP) {
+        address = this->GetSp();
+    } else {
+        address = this->GetReg(Rn);
+    }
+    address += offset;
+
+    switch (memop) {
+    case MemOp::Store: {
+        u64 data = this->GetReg(Rt);
+        m_memory.WriteBlock(address, &data, datasize / 8);
+        break;
+    }
+    case MemOp::Load: {
+        u64 data = 0;
+        m_memory.ReadBlock(address, &data, datasize / 8);
+        if (signed_) {
+            this->SetReg(Rt, SignExtend(data, datasize, regsize));
+        } else {
+            this->SetReg(Rt, data);
+        }
+        break;
+    }
+    case MemOp::Prefetch:
+        break;
+    }
+
+    return true;
+}
+
+bool InterpreterVisitor::STRx_reg(Imm<2> size, Imm<1> opc_1, Reg Rm, Imm<3> option, bool S, Reg Rn,
+                                  Reg Rt) {
+    const Imm<1> opc_0{0};
+    const size_t scale = size.ZeroExtend<size_t>();
+    const u8 shift = S ? static_cast<u8>(scale) : 0;
+    if (!option.Bit<1>()) {
+        // Unallocated encoding
+        return false;
+    }
+    return this->RegisterOffset(scale, shift, size, opc_1, opc_0, Rm, option, Rn, Rt);
+}
+
+bool InterpreterVisitor::LDRx_reg(Imm<2> size, Imm<1> opc_1, Reg Rm, Imm<3> option, bool S, Reg Rn,
+                                  Reg Rt) {
+    const Imm<1> opc_0{1};
+    const size_t scale = size.ZeroExtend<size_t>();
+    const u8 shift = S ? static_cast<u8>(scale) : 0;
+    if (!option.Bit<1>()) {
+        // Unallocated encoding
+        return false;
+    }
+    return this->RegisterOffset(scale, shift, size, opc_1, opc_0, Rm, option, Rn, Rt);
+}
+
+bool InterpreterVisitor::SIMDOffset(size_t scale, u8 shift, Imm<1> opc_0, Reg Rm, Imm<3> option,
+                                    Reg Rn, Vec Vt) {
+    const auto memop = opc_0 == 1 ? MemOp::Load : MemOp::Store;
+    const size_t datasize = 8 << scale;
+
+    // Operation
+    const u64 offset = this->ExtendReg(64, Rm, option, shift);
+
+    u64 address;
+    if (Rn == Reg::SP) {
+        address = this->GetSp();
+    } else {
+        address = this->GetReg(Rn);
+    }
+    address += offset;
+
+    switch (memop) {
+    case MemOp::Store: {
+        u128 data = VectorGetElement(this->GetVec(Vt), datasize);
+        m_memory.WriteBlock(address, &data, datasize / 8);
+        break;
+    }
+    case MemOp::Load: {
+        u128 data{};
+        m_memory.ReadBlock(address, &data, datasize / 8);
+        this->SetVec(Vt, data);
+        break;
+    }
+    default:
+        UNREACHABLE();
+    }
+
+    return true;
+}
+
+bool InterpreterVisitor::STR_reg_fpsimd(Imm<2> size, Imm<1> opc_1, Reg Rm, Imm<3> option, bool S,
+                                        Reg Rn, Vec Vt) {
+    const Imm<1> opc_0{0};
+    const size_t scale = Dynarmic::concatenate(opc_1, size).ZeroExtend<size_t>();
+    if (scale > 4) {
+        // Unallocated encoding
+        return false;
+    }
+    const u8 shift = S ? static_cast<u8>(scale) : 0;
+    if (!option.Bit<1>()) {
+        // Unallocated encoding
+        return false;
+    }
+    return this->SIMDOffset(scale, shift, opc_0, Rm, option, Rn, Vt);
+}
+
+bool InterpreterVisitor::LDR_reg_fpsimd(Imm<2> size, Imm<1> opc_1, Reg Rm, Imm<3> option, bool S,
+                                        Reg Rn, Vec Vt) {
+    const Imm<1> opc_0{1};
+    const size_t scale = Dynarmic::concatenate(opc_1, size).ZeroExtend<size_t>();
+    if (scale > 4) {
+        // Unallocated encoding
+        return false;
+    }
+    const u8 shift = S ? static_cast<u8>(scale) : 0;
+    if (!option.Bit<1>()) {
+        // Unallocated encoding
+        return false;
+    }
+    return this->SIMDOffset(scale, shift, opc_0, Rm, option, Rn, Vt);
+}
+
+std::optional<u64> MatchAndExecuteOneInstruction(Core::Memory::Memory& memory, mcontext_t* context,
+                                                 fpsimd_context* fpsimd_context) {
+    // Construct the interpreter.
+    std::span<u64, 31> regs(reinterpret_cast<u64*>(context->regs), 31);
+    std::span<u128, 32> vregs(reinterpret_cast<u128*>(fpsimd_context->vregs), 32);
+    u64& sp = *reinterpret_cast<u64*>(&context->sp);
+    const u64& pc = *reinterpret_cast<u64*>(&context->pc);
+
+    InterpreterVisitor visitor(memory, regs, vregs, sp, pc);
+
+    // Read the instruction at the program counter.
+    u32 instruction = memory.Read32(pc);
+    bool was_executed = false;
+
+    // Interpret the instruction.
+    if (auto decoder = Dynarmic::A64::Decode<VisitorBase>(instruction)) {
+        was_executed = decoder->get().call(visitor, instruction);
+    } else {
+        LOG_ERROR(Core_ARM, "Unallocated encoding: {:#x}", instruction);
+    }
+
+    if (was_executed) {
+        return pc + 4;
+    }
+
+    return std::nullopt;
+}
+
+} // namespace Core

src/core/arm/nce/interpreter_visitor.h

@@ -0,0 +1,103 @@
+// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
+// SPDX-FileCopyrightText: Copyright 2023 merryhime <https://mary.rs>
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <signal.h>
+#include <unistd.h>
+
+#include "core/arm/nce/visitor_base.h"
+
+namespace Core {
+
+namespace Memory {
+class Memory;
+}
+
+class InterpreterVisitor final : public VisitorBase {
+public:
+    explicit InterpreterVisitor(Core::Memory::Memory& memory, std::span<u64, 31> regs,
+                                std::span<u128, 32> fpsimd_regs, u64& sp, const u64& pc)
+        : m_memory(memory), m_regs(regs), m_fpsimd_regs(fpsimd_regs), m_sp(sp), m_pc(pc) {}
+    ~InterpreterVisitor() override = default;
+
+    enum class MemOp {
+        Load,
+        Store,
+        Prefetch,
+    };
+
+    u128 GetVec(Vec v);
+    u64 GetReg(Reg r);
+    u64 GetSp();
+    u64 GetPc();
+
+    void SetVec(Vec v, u128 value);
+    void SetReg(Reg r, u64 value);
+    void SetSp(u64 value);
+
+    u64 ExtendReg(size_t bitsize, Reg reg, Imm<3> option, u8 shift);
+
+    // Loads and stores - Load/Store Exclusive
+    bool Ordered(size_t size, bool L, bool o0, Reg Rn, Reg Rt);
+    bool STLLR(Imm<2> size, Reg Rn, Reg Rt) override;
+    bool STLR(Imm<2> size, Reg Rn, Reg Rt) override;
+    bool LDLAR(Imm<2> size, Reg Rn, Reg Rt) override;
+    bool LDAR(Imm<2> size, Reg Rn, Reg Rt) override;
+
+    // Loads and stores - Load register (literal)
+    bool LDR_lit_gen(bool opc_0, Imm<19> imm19, Reg Rt) override;
+    bool LDR_lit_fpsimd(Imm<2> opc, Imm<19> imm19, Vec Vt) override;
+
+    // Loads and stores - Load/Store register pair
+    bool STP_LDP_gen(Imm<2> opc, bool not_postindex, bool wback, Imm<1> L, Imm<7> imm7, Reg Rt2,
+                     Reg Rn, Reg Rt) override;
+    bool STP_LDP_fpsimd(Imm<2> opc, bool not_postindex, bool wback, Imm<1> L, Imm<7> imm7, Vec Vt2,
+                        Reg Rn, Vec Vt) override;
+
+    // Loads and stores - Load/Store register (immediate)
+    bool RegisterImmediate(bool wback, bool postindex, size_t scale, u64 offset, Imm<2> size,
+                           Imm<2> opc, Reg Rn, Reg Rt);
+    bool STRx_LDRx_imm_1(Imm<2> size, Imm<2> opc, Imm<9> imm9, bool not_postindex, Reg Rn,
+                         Reg Rt) override;
+    bool STRx_LDRx_imm_2(Imm<2> size, Imm<2> opc, Imm<12> imm12, Reg Rn, Reg Rt) override;
+    bool STURx_LDURx(Imm<2> size, Imm<2> opc, Imm<9> imm9, Reg Rn, Reg Rt) override;
+
+    bool SIMDImmediate(bool wback, bool postindex, size_t scale, u64 offset, MemOp memop, Reg Rn,
+                       Vec Vt);
+    bool STR_imm_fpsimd_1(Imm<2> size, Imm<1> opc_1, Imm<9> imm9, bool not_postindex, Reg Rn,
+                          Vec Vt) override;
+    bool STR_imm_fpsimd_2(Imm<2> size, Imm<1> opc_1, Imm<12> imm12, Reg Rn, Vec Vt) override;
+    bool LDR_imm_fpsimd_1(Imm<2> size, Imm<1> opc_1, Imm<9> imm9, bool not_postindex, Reg Rn,
+                          Vec Vt) override;
+    bool LDR_imm_fpsimd_2(Imm<2> size, Imm<1> opc_1, Imm<12> imm12, Reg Rn, Vec Vt) override;
+    bool STUR_fpsimd(Imm<2> size, Imm<1> opc_1, Imm<9> imm9, Reg Rn, Vec Vt) override;
+    bool LDUR_fpsimd(Imm<2> size, Imm<1> opc_1, Imm<9> imm9, Reg Rn, Vec Vt) override;
+
+    // Loads and stores - Load/Store register (register offset)
+    bool RegisterOffset(size_t scale, u8 shift, Imm<2> size, Imm<1> opc_1, Imm<1> opc_0, Reg Rm,
+                        Imm<3> option, Reg Rn, Reg Rt);
+    bool STRx_reg(Imm<2> size, Imm<1> opc_1, Reg Rm, Imm<3> option, bool S, Reg Rn,
+                  Reg Rt) override;
+    bool LDRx_reg(Imm<2> size, Imm<1> opc_1, Reg Rm, Imm<3> option, bool S, Reg Rn,
+                  Reg Rt) override;
+
+    bool SIMDOffset(size_t scale, u8 shift, Imm<1> opc_0, Reg Rm, Imm<3> option, Reg Rn, Vec Vt);
+    bool STR_reg_fpsimd(Imm<2> size, Imm<1> opc_1, Reg Rm, Imm<3> option, bool S, Reg Rn,
+                        Vec Vt) override;
+    bool LDR_reg_fpsimd(Imm<2> size, Imm<1> opc_1, Reg Rm, Imm<3> option, bool S, Reg Rn,
+                        Vec Vt) override;
+
+private:
+    Core::Memory::Memory& m_memory;
+    std::span<u64, 31> m_regs;
+    std::span<u128, 32> m_fpsimd_regs;
+    u64& m_sp;
+    const u64& m_pc;
+};
+
+std::optional<u64> MatchAndExecuteOneInstruction(Core::Memory::Memory& memory, mcontext_t* context,
+                                                 fpsimd_context* fpsimd_context);
+
+} // namespace Core