Add a graphics card device stub

libSceGnmDriver LLE requires implementing the "/dev/gc" device

CMakeLists.txt

@@ -701,6 +701,8 @@ set(CORE src/core/aerolib/stubs.cpp
          src/core/address_space.h
          src/core/devices/base_device.cpp
          src/core/devices/base_device.h
+         src/core/devices/gc_device.cpp
+         src/core/devices/gc_device.h
          src/core/devices/ioccom.h
          src/core/devices/logger.cpp
          src/core/devices/logger.h

src/core/devices/gc_device.cpp

@@ -0,0 +1,74 @@
+// SPDX-FileCopyrightText: Copyright 2024 shadPS4 Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "common/logging/log.h"
+#include "gc_device.h"
+
+namespace Core::Devices {
+
+std::shared_ptr<BaseDevice> GcDevice::Create(u32 handle, const char*, int, u16) {
+    return std::shared_ptr<BaseDevice>(
+        reinterpret_cast<Devices::BaseDevice*>(new GcDevice(handle)));
+}
+
+int GcDevice::ioctl(u64 cmd, Common::VaCtx* args) {
+    LOG_ERROR(Kernel_Pthread, "(STUBBED) called");
+    return 0;
+}
+
+s64 GcDevice::write(const void* buf, size_t nbytes) {
+    LOG_ERROR(Kernel_Pthread, "(STUBBED) called");
+    return 0;
+}
+
+size_t GcDevice::writev(const Libraries::Kernel::SceKernelIovec* iov, int iovcnt) {
+    LOG_ERROR(Kernel_Pthread, "(STUBBED) called");
+    return 0;
+}
+
+size_t GcDevice::readv(const Libraries::Kernel::SceKernelIovec* iov, int iovcnt) {
+    LOG_ERROR(Kernel_Pthread, "(STUBBED) called");
+    return 0;
+}
+
+s64 GcDevice::preadv(const Libraries::Kernel::SceKernelIovec* iov, int iovcnt, u64 offset) {
+    LOG_ERROR(Kernel_Pthread, "(STUBBED) called");
+    return 0;
+}
+
+s64 GcDevice::lseek(s64 offset, int whence) {
+    LOG_ERROR(Kernel_Pthread, "(STUBBED) called");
+    return 0;
+}
+
+s64 GcDevice::read(void* buf, size_t nbytes) {
+    LOG_ERROR(Kernel_Pthread, "(STUBBED) called");
+    return 0;
+}
+
+int GcDevice::fstat(Libraries::Kernel::OrbisKernelStat* sb) {
+    LOG_ERROR(Kernel_Pthread, "(STUBBED) called");
+    return 0;
+}
+
+s32 GcDevice::fsync() {
+    LOG_ERROR(Kernel_Pthread, "(STUBBED) called");
+    return 0;
+}
+
+int GcDevice::ftruncate(s64 length) {
+    LOG_ERROR(Kernel_Pthread, "(STUBBED) called");
+    return 0;
+}
+
+int GcDevice::getdents(void* buf, u32 nbytes, s64* basep) {
+    LOG_ERROR(Kernel_Pthread, "(STUBBED) called");
+    return 0;
+}
+
+s64 GcDevice::pwrite(const void* buf, size_t nbytes, u64 offset) {
+    LOG_ERROR(Kernel_Pthread, "(STUBBED) called");
+    return 0;
+}
+
+} // namespace Core::Devices

src/core/devices/gc_device.h

@@ -0,0 +1,33 @@
+// SPDX-FileCopyrightText: Copyright 2024 shadPS4 Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+#include <memory>
+#include "base_device.h"
+
+namespace Core::Devices {
+
+class GcDevice final : BaseDevice {
+    u32 handle;
+
+public:
+    static std::shared_ptr<BaseDevice> Create(u32 handle, const char*, int, u16);
+    explicit GcDevice(u32 handle) : handle(handle) {}
+
+    ~GcDevice() override = default;
+
+    int ioctl(u64 cmd, Common::VaCtx* args) override;
+    s64 write(const void* buf, size_t nbytes) override;
+    size_t readv(const Libraries::Kernel::SceKernelIovec* iov, int iovcnt) override;
+    size_t writev(const Libraries::Kernel::SceKernelIovec* iov, int iovcnt) override;
+    s64 preadv(const Libraries::Kernel::SceKernelIovec* iov, int iovcnt, u64 offset) override;
+    s64 lseek(s64 offset, int whence) override;
+    s64 read(void* buf, size_t nbytes) override;
+    int fstat(Libraries::Kernel::OrbisKernelStat* sb) override;
+    s32 fsync() override;
+    int ftruncate(s64 length) override;
+    int getdents(void* buf, u32 nbytes, s64* basep) override;
+    s64 pwrite(const void* buf, size_t nbytes, u64 offset) override;
+};
+
+} // namespace Core::Devices

src/core/libraries/kernel/file_system.cpp

@@ -10,6 +10,7 @@
 #include "common/singleton.h"
 #include "core/devices/console_device.h"
 #include "core/devices/deci_tty6_device.h"
+#include "core/devices/gc_device.h"
 #include "core/devices/logger.h"
 #include "core/devices/nop_device.h"
 #include "core/devices/random_device.h"
@@ -52,7 +53,8 @@ static std::map<std::string, FactoryDevice> available_device = {
     {"/dev/random",   &D::RandomDevice::Create },
     {"/dev/srandom",  &D::SRandomDevice::Create },
     {"/dev/console",  &D::ConsoleDevice::Create },
-    {"/dev/deci_tty6",&D::DeciTty6Device::Create }
+    {"/dev/deci_tty6",&D::DeciTty6Device::Create },
+    {"/dev/gc",       &D::GcDevice::Create }
     // clang-format on
 };