Fuji,EE,IOP: Now our MIPS can make SYSCALL

app/src/main/CMakeLists.txt

@@ -48,6 +48,7 @@ target_sources(zenith PRIVATE
     ${ZENITH_DIR}/hle/bios_patch.cpp
     ${ZENITH_DIR}/hle/group_mgr.cpp
     ${ZENITH_DIR}/hle/bios_class.cpp
+    ${ZENITH_DIR}/hle/syscall_gate.cpp
     ${ZENITH_DIR}/fs/bios_loader.cpp
     ${ZENITH_DIR}/iop/iop_core.cpp
     ${ZENITH_DIR}/iop/iop_cop.cpp
@@ -63,6 +64,7 @@ target_sources(zenith PRIVATE
     ${ZENITH_DIR}/console/emu_thread.cpp
     ${ZENITH_DIR}/console/sched_logical.cpp
     ${ZENITH_DIR}/console/intc.cpp
+    ${ZENITH_DIR}/console/backdoor.cpp
     ${ZENITH_MISC_DIR}/jvm_comm.cpp
     ${ZENITH_MISC_DIR}/drivers_glvk_jni.cpp
     ${ZENITH_MISC_DIR}/bios_jni.cpp

app/src/main/cpp/zenith/console/backdoor.cpp

@@ -0,0 +1,46 @@
+#include <console/backdoor.h>
+
+namespace zenith {
+    std::shared_ptr<console::RedPillow> redBox;
+}
+
+namespace zenith::console {
+    RedPillow::RedPillow(EmuVM& aliveVm) {
+        vm = std::make_unique<raw_reference<EmuVM>>(std::ref(aliveVm));
+        mutual = std::unique_lock<std::mutex>();
+        vmRefs = 1;
+    }
+    raw_reference<EmuVM> RedPillow::openVm() {
+        std::thread::id nub{};
+        if (owner != std::this_thread::get_id()) {
+            mutual.lock();
+            owner = nub;
+        }
+        if (owner != nub) {
+            if (owner != std::this_thread::get_id())
+                throw AppFail("This resource should have the lock held until the object is released");
+        } else {
+            owner = std::this_thread::get_id();
+        }
+        raw_reference<EmuVM> vmRef{};
+        if (vmRefs) {
+            vmRef = *vm;
+            vmRefs++;
+        }
+        return vmRef;
+    }
+    void RedPillow::leaveVm(raw_reference<EmuVM> lvm) {
+        if (!mutual.try_lock()) {
+            if (owner != std::this_thread::get_id())
+                throw AppFail("The program flow is broken, review the usage of RedPillow in the code");
+        }
+        vmRefs--;
+        if (!vm || vmRefs <= 0) {
+            vm.reset();
+            vm = std::make_unique<raw_reference<EmuVM>>(lvm);
+            vmRefs = 1;
+        }
+        owner = {};
+        mutual.unlock();
+    }
+}

app/src/main/cpp/zenith/console/backdoor.h

@@ -0,0 +1,28 @@
+#pragma once
+
+#include <common/types.h>
+#include <thread>
+#include <mutex>
+
+namespace zenith::console {
+    class EmuVM;
+
+    class RedPillow {
+    public:
+        RedPillow(EmuVM& aliveVm);
+
+        raw_reference<EmuVM> openVm();
+        void leaveVm(raw_reference<EmuVM> lvm);
+
+    private:
+        std::thread::id owner;
+        std::unique_lock<std::mutex> mutual;
+        std::unique_ptr<raw_reference<EmuVM>> vm;
+        i32 vmRefs;
+    };
+}
+
+namespace zenith {
+    extern std::shared_ptr<console::RedPillow> redBox;
+}
+

app/src/main/cpp/zenith/console/emu_vm.cpp

@@ -1,8 +1,10 @@
 // SPDX-short-identifier: MIT, Version N/A
 // This file is protected by the MIT license (please refer to LICENSE.md before making any changes, copying, or redistributing this software)
-#include <console/emu_vm.h>
 #include <common/global.h>
+#include <console/emu_vm.h>
+#include <console/backdoor.h>
 
+#include <eeiv/ee_info.h>
 #define TestBiosAccess 0
 namespace zenith::console {
     EmuVM::EmuVM(JNIEnv* env,
@@ -22,6 +24,8 @@ namespace zenith::console {
         frames = 30;
 
         intc = std::make_shared<INTCInfra>(*this);
+        // Our way to perform interconnection between different isolated components
+        redBox = std::make_shared<RedPillow>(*this);
     }
 
     void EmuVM::startVM() {
@@ -55,4 +59,20 @@ namespace zenith::console {
         mips->resetCore();
         iop->resetIOP();
     }
+    void EmuVM::dealWithSyscalls() {
+        hle::SyscallOrigin ori{};
+        // 08: Syscall Generated unconditionally by syscall instruction
+        if (mips->cop0.cause.exCode == 0x8)
+            ori = hle::SysEmotionEngine;
+        else if (iop->cop.cause.code == 0x8)
+            ori = hle::SysIop;
+
+        if (ori == hle::SysEmotionEngine) {
+            i16 eeSystem{*mips->gprAt<i16*>(eeiv::$v1)};
+            dealer.doSyscall(ori, eeSystem);
+            mips->cop0.cause.exCode = 0;
+        } else {
+            iop->handleException(0x80000080, 0x8);
+        }
+    }
 }

app/src/main/cpp/zenith/console/emu_vm.h

@@ -4,6 +4,7 @@
 #include <mio/main_memory.h>
 #include <gpu/hw_render.h>
 #include <hle/bios_patch.h>
+#include <hle/syscall_gate.h>
 #include <gpu/exhibition_engine.h>
 
 #include <console/emu_thread.h>
@@ -18,6 +19,7 @@ namespace zenith::console {
 
         void resetVM();
         void startVM();
+        void dealWithSyscalls();
 
         std::shared_ptr<hle::BiosPatcher> biosHLE;
 
@@ -33,5 +35,7 @@ namespace zenith::console {
     private:
         EmuThread emuThread;
         std::shared_ptr<INTCInfra> intc;
+
+        hle::SyscallDealer dealer;
     };
 }

app/src/main/cpp/zenith/eeiv/ee_info.h

@@ -26,7 +26,8 @@ namespace zenith::fuji {
         Cop0Mtc = 0x4,
         Cop0Bc0 = 0x8,
         Addi = 0x8,
-        Slti = 0xa,
+        EeSlti = 0xa,
+        EeSpecialSyscall = 0xc,
         SpecialBreak = 0xd,
         RegImmBltzal = 0x10,
         CopOpcodes = 0x10,
@@ -44,7 +45,7 @@ namespace zenith::fuji {
         Nop = 0x33,
         Ld = 0x37,
 
-        SpecialXor = 0x26,
+        EeSpecialXor = 0x26,
         SpecialSlt = 0x2a,
         Sw = 0x2b,
     };

app/src/main/cpp/zenith/fuji/iop_interpreter.cpp

@@ -1,5 +1,6 @@
 #include <fuji/iop_interpreter.h>
-#include <iop/iop_core.h>
+#include <console/backdoor.h>
+#include <console/emu_vm.h>
 
 #define SwOpcode(op)\
     op(Operands(opcode, opeRegs));\
@@ -39,7 +40,7 @@ namespace zenith::fuji {
         u32* gprSrc = &ioMips.IOGPRs[ops.thi];
         u32* gprDest = &ioMips.IOGPRs[ops.sec];
         u8 opp{ops.operation.pa8[3]};
-        if (opp == Slti) {
+        if (opp == IopSlti) {
             i32 imm{ops.operation.sins & 0xffff};
             *gprDest = *gprSrc < imm;
         } else if (opp == Sltiu) {
@@ -57,6 +58,13 @@ namespace zenith::fuji {
         orSMips(ops);
         ioMips.IOGPRs[ops.fir] = ~ioMips.IOGPRs[ops.fir];
     }
+    IvFujiIopAsm(syscall) {
+        ioMips.cop.cause.code = 0x8;
+        raw_reference<console::EmuVM> vm{redBox->openVm()};
+        vm->dealWithSyscalls();
+        redBox->leaveVm(vm);
+    }
+
     u32 IOPInterpreter::execCopRow(u32 opcode, std::array<u8, 3> opeRegs) {
         u16 cop{static_cast<u16>((opcode >> 21) & 0x1f)};
         cop |= static_cast<u16>((opcode >> 26) & 0x3) << 8;
@@ -70,10 +78,11 @@ namespace zenith::fuji {
     u32 IOPInterpreter::execIO3S(u32 opcode, std::array<u8, 3> opeRegs) {
         u8 specialOp{static_cast<u8>(opcode & 0x3f)};
         switch (specialOp) {
-        case SpecialMfhi: SwOpcode(mfhi);
-        case SpecialMthi: SwOpcode(mthi);
-        case SpecialOr:   SwOpcode(orSMips);
-        case SpecialXor:  SwOpcode(xorSMips);
+        case IopSpecialSyscall: SwOpcode(syscall);
+        case SpecialMfhi:       SwOpcode(mfhi);
+        case SpecialMthi:       SwOpcode(mthi);
+        case SpecialOr:         SwOpcode(orSMips);
+        case IopSpecialXor:     SwOpcode(xorSMips);
         }
         return opcode;
     }
@@ -85,7 +94,7 @@ namespace zenith::fuji {
         case 0x10 ... 0x13:
             execCopRow(opcode, opeRegs);
             break;
-        case Slti:
+        case IopSlti:
         case Sltiu:
             SwOpcode(sltBy);
         default:

app/src/main/cpp/zenith/fuji/iop_interpreter.h

@@ -9,13 +9,14 @@ namespace zenith::fuji {
         SpecialOp = 0x0,
         CopMfc = 0x0,
         CopMtc = 0x4,
-        Slti = 0x0a,
+        IopSlti = 0x0a,
         Sltiu = 0x0b,
+        IopSpecialSyscall = 0xc,
         SpecialMfhi = 0x10,
         CopRfe = 0x10,
         SpecialMthi = 0x11,
         SpecialOr = 0x25,
-        SpecialXor = 0x26,
+        IopSpecialXor = 0x26,
         SpecialNor = 0x27
     };
 
@@ -32,6 +33,7 @@ namespace zenith::fuji {
         u32 fetchPcInst() override;
 
         IvFujiOp(sltBy);
+        IvFujiOp(syscall);
 
         IvFujiOp(mfhi);
         IvFujiOp(mthi);

app/src/main/cpp/zenith/fuji/mipsiv_interpreter.h

@@ -16,7 +16,6 @@ namespace zenith::fuji {
             Eret = 0x10,
             Cop0 = 0x12
         };
-
         friend EffectivePipeline operator^(EffectivePipeline dest, EffectivePipeline src) {
             return static_cast<EffectivePipeline>(static_cast<u16>(dest) ^ static_cast<u16>(src));
         }
@@ -77,6 +76,7 @@ namespace zenith::fuji {
         IvFujiOp(bltzal);
         IvFujiOp(bgez); IvFujiOp(bgezl); IvFujiOp(bgezall);
         IvFujiOp(mtsab); IvFujiOp(mtsah);
+        IvFujiOp(syscall);
 
         // Memory read functions through direct translation
         IvFujiOp(lb); IvFujiOp(lbu);

app/src/main/cpp/zenith/fuji/mipsiv_isa.cpp

@@ -1,6 +1,8 @@
 #include <fuji/mipsiv_interpreter.h>
 #include <eeiv/ee_engine.h>
 #include <eeiv/ee_assembler.h>
+#include <console/backdoor.h>
+#include <console/emu_vm.h>
 namespace zenith::fuji {
     IvFujiSuperAsm(addi) {
         mainMips.GPRs[ops.sec].words[0] = ops.operation.pa16[0] +
@@ -107,4 +109,11 @@ namespace zenith::fuji {
     IvFujiSuperAsm(iBreak) {
         mainMips.handleException(1, 0x80000180, 0x9);
     }
+    IvFujiSuperAsm(syscall) {
+        mainMips.cop0.cause.exCode = 0x8;
+        // We need to directly handle these syscall, instead of mainMips.chPC(0x80000180);
+        auto vm{redBox->openVm()};
+        vm->dealWithSyscalls();
+        redBox->leaveVm(vm);
+    }
 }

app/src/main/cpp/zenith/fuji/mipsiv_opcodes.cpp

@@ -10,9 +10,10 @@
 namespace zenith::fuji {
     u32 MipsIVInterpreter::decMipsIvS(u32 opcode, InvokeOpInfo& decode) {
         switch (opcode & 0x3f) {
-        case SpecialBreak: SWCached(iBreak);
-        case SpecialXor:   SWCached(ivXor);
-        case SpecialSlt:   SWCached(slt);
+        case EeSpecialSyscall: SWCached(syscall);
+        case SpecialBreak:     SWCached(iBreak);
+        case EeSpecialXor:     SWCached(ivXor);
+        case SpecialSlt:       SWCached(slt);
         }
         return opcode & 0x3f;
     }
@@ -66,8 +67,8 @@ namespace zenith::fuji {
         case RegImmOpcodes:
             decMipsIvRegImm(opcode, decode);
             break;
-        case Addi:  SWCached(addi);
-        case Slti:  SWCached(slti);
+        case Addi:   SWCached(addi);
+        case EeSlti: SWCached(slti);
         case CopOpcodes:
             decMipsIvCop0(opcode, decode);
             break;

app/src/main/cpp/zenith/hle/syscall_gate.cpp

@@ -0,0 +1,20 @@
+#include <hle/syscall_gate.h>
+#include <console/emu_vm.h>
+
+namespace zenith::hle {
+    void SyscallDealer::hleResetEE(raw_reference<console::EmuVM> vm) {
+        i32 resetParam{*vm->mips->gprAt<i32*>(Param0)};
+        if (resetParam == 0) {}
+        else if (resetParam == 1) {}
+    }
+    void SyscallDealer::doSyscall(SyscallOrigin origin, i16 sys) {
+        auto vm{redBox->openVm()};
+        if (origin == SysEmotionEngine) {
+            switch (sys) {
+            case 0x01: // void ResetEE(i32 resetFlag);
+                hleResetEE(vm); break;
+            }
+        }
+        redBox->leaveVm(vm);
+    }
+}

app/src/main/cpp/zenith/hle/syscall_gate.h

@@ -0,0 +1,27 @@
+#pragma once
+
+#include <common/types.h>
+#include <console/backdoor.h>
+#include <eeiv/ee_info.h>
+namespace zenith::hle {
+    enum CallParams {
+        Return = eeiv::$v0,
+        Param0 = eeiv::$a0,
+        Param1 = eeiv::$a1,
+        Param2 = eeiv::$a2,
+        Param3 = eeiv::$a3,
+        Param4 = eeiv::$t0,
+        Param5 = eeiv::$t1
+    };
+
+    enum SyscallOrigin {
+        SysEmotionEngine,
+        SysIop
+    };
+    class SyscallDealer {
+    public:
+        void doSyscall(SyscallOrigin origin, i16 sys);
+    private:
+        void hleResetEE(raw_reference<console::EmuVM> vm);
+    };
+}

app/src/main/cpp/zenith/iop/iop_core.cpp

@@ -47,4 +47,19 @@ namespace zenith::iop {
         ioPc += 4;
         return ioOpcode;
     }
+    void IOMipsCore::handleException(u32 vec, u8 code) {
+        cop.cause.code = code;
+        if (onBranch)
+            cop.ePC = ioPc - 4;
+        else
+            cop.ePC = ioPc;
+        cop.cause.bd = onBranch;
+        cop.status.ieo = cop.status.iep;
+        cop.status.iep = cop.status.iec;
+        cop.status.iec = false;
+
+        // We do this to offset PC being incremented
+        ioPc = vec - 4;
+        onBranch = false;
+    }
 }

app/src/main/cpp/zenith/iop/iop_core.h

@@ -19,6 +19,8 @@ namespace zenith::iop {
         u32 fetchByPC();
 
         void intByINTC(bool isInt);
+        void handleException(u32 vec, u8 code);
+
         std::array<u32, 32> IOGPRs;
         std::array<IOPCache, 128> iCache;
         std::shared_ptr<mio::GlobalMemory> iopMem;
@@ -42,6 +44,8 @@ namespace zenith::iop {
             ioPc,
             cyclesToIO;
         IopCop cop;
+        bool onBranch{false};
+
     private:
         u8* iopPrivateAddrSolver(u32 address);
 

build.gradle.kts

@@ -1,7 +1,7 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 plugins {
-    id("com.android.application") version "8.1.3" apply false
-    id("com.android.library") version "8.1.3" apply false
+    id("com.android.application") version "8.1.4" apply false
+    id("com.android.library") version "8.1.4" apply false
     id("org.jetbrains.kotlin.android") version "1.8.20" apply false
 }