Load custom modules stored in custom_modules/<gameid> (#4440)

* Load custom modules stored in custom_modules/<gameid>

* Fix formatting

src/common/path_util.cpp

@@ -131,6 +131,7 @@ static auto UserPaths = [] {
     create_path(PathType::CacheDir, user_dir / CACHE_DIR);
     create_path(PathType::FontsDir, user_dir / FONTS_DIR);
     create_path(PathType::HomeDir, user_dir / HOME_DIR);
+    create_path(PathType::CustomModulesDir, user_dir / CUSTOM_MODULES_DIR);
 
     std::ofstream notice_file(user_dir / CUSTOM_TROPHY / "Notice.txt");
     if (notice_file.is_open()) {

src/common/path_util.h

@@ -10,23 +10,24 @@
 namespace Common::FS {
 
 enum class PathType {
-    UserDir,        // Where shadPS4 stores its data.
-    LogDir,         // Where log files are stored.
-    ScreenshotsDir, // Where screenshots are stored.
-    ShaderDir,      // Where shaders are stored.
-    TempDataDir,    // Where game temp data is stored.
-    GameDataDir,    // Where game data is stored.
-    SysModuleDir,   // Where system modules are stored.
-    DownloadDir,    // Where downloads/temp files are stored.
-    CapturesDir,    // Where rdoc captures are stored.
-    CheatsDir,      // Where cheats are stored.
-    PatchesDir,     // Where patches are stored.
-    MetaDataDir,    // Where game metadata (e.g. trophies and menu backgrounds) is stored.
-    CustomTrophy,   // Where custom files for trophies are stored.
-    CustomConfigs,  // Where custom files for different games are stored.
-    CacheDir,       // Where pipeline and shader cache is stored.
-    FontsDir,       // Where dumped system fonts are stored.
-    HomeDir,        // PS4 home directory
+    UserDir,         // Where shadPS4 stores its data.
+    LogDir,          // Where log files are stored.
+    ScreenshotsDir,  // Where screenshots are stored.
+    ShaderDir,       // Where shaders are stored.
+    TempDataDir,     // Where game temp data is stored.
+    GameDataDir,     // Where game data is stored.
+    SysModuleDir,    // Where system modules are stored.
+    DownloadDir,     // Where downloads/temp files are stored.
+    CapturesDir,     // Where rdoc captures are stored.
+    CheatsDir,       // Where cheats are stored.
+    PatchesDir,      // Where patches are stored.
+    MetaDataDir,     // Where game metadata (e.g. trophies and menu backgrounds) is stored.
+    CustomTrophy,    // Where custom files for trophies are stored.
+    CustomConfigs,   // Where custom files for different games are stored.
+    CacheDir,        // Where pipeline and shader cache is stored.
+    FontsDir,        // Where dumped system fonts are stored.
+    HomeDir,         // PS4 home directory
+    CustomModulesDir // Where custom modules are stored.
 };
 
 constexpr auto PORTABLE_DIR = "user";
@@ -48,6 +49,7 @@ constexpr auto CUSTOM_CONFIGS = "custom_configs";
 constexpr auto CACHE_DIR = "cache";
 constexpr auto FONTS_DIR = "fonts";
 constexpr auto HOME_DIR = "home";
+constexpr auto CUSTOM_MODULES_DIR = "custom_modules";
 
 // Filenames
 constexpr auto LOG_FILE = "shad_log.txt";

src/core/linker.cpp

@@ -5,6 +5,7 @@
 #include "common/arch.h"
 #include "common/assert.h"
 #include "common/elf_info.h"
+#include "common/logging/formatter.h"
 #include "common/logging/log.h"
 #include "common/path_util.h"
 #include "common/string_util.h"
@@ -125,6 +126,24 @@ void Linker::Execute(const std::vector<std::string>& args) {
         // Have libSceSysmodule preload our libraries.
         Libraries::SysModule::sceSysmodulePreloadModuleForLibkernel();
 
+        // Load and start custom modules from the user directory.
+        std::string_view id = Common::ElfInfo::Instance().GameSerial();
+        const auto& custom_mod_directory =
+            Common::FS::GetUserPath(Common::FS::PathType::CustomModulesDir) / id;
+        if (!std::filesystem::exists(custom_mod_directory)) {
+            std::filesystem::create_directory(custom_mod_directory);
+        }
+        for (const auto& entry : std::filesystem::directory_iterator(custom_mod_directory)) {
+            if (entry.is_regular_file()) {
+                LOG_INFO(Core_Linker, "Loading custom module: {}",
+                         fmt::UTF(entry.path().u8string()));
+                if (LoadAndStartModule(entry.path(), 0, nullptr, nullptr) == -1) {
+                    LOG_ERROR(Core_Linker, "Failed to load custom module: {}",
+                              fmt::UTF(entry.path().u8string()));
+                }
+            }
+        }
+
         // Simulate libSceGnmDriver initialization, which maps a chunk of direct memory.
         // Some games fail without accurately emulating this behavior.
         s64 phys_addr{};