initial fs work (logging mostly)

CMakeLists.txt

@@ -45,6 +45,12 @@ set(SYSTEMSERVICE_SOURCES src/Emulator/HLE/Libraries/LibSystemService/system_ser
                           src/Emulator/HLE/Libraries/LibSystemService/system_service.h
 )
 
+set(FILESYSTEM_SOURCES src/Emulator/HLE/Libraries/LibKernel/FileSystem/file_system.cpp
+                       src/Emulator/HLE/Libraries/LibKernel/FileSystem/file_system.h
+                       src/Emulator/HLE/Libraries/LibKernel/FileSystem/posix_file_system.cpp
+                       src/Emulator/HLE/Libraries/LibKernel/FileSystem/posix_file_system.h
+)
+
 set(UTIL_SOURCES src/Emulator/Util/singleton.h
 )
 
@@ -53,6 +59,7 @@ add_executable(shadps4
     ${USERSERVICE_SOURCES}
     ${PAD_SOURCES}
     ${SYSTEMSERVICE_SOURCES}
+    ${FILESYSTEM_SOURCES}
     ${UTIL_SOURCES}
     src/main.cpp
     src/types.h

src/Core/PS4/HLE/LibKernel.cpp

@@ -10,6 +10,8 @@
 #include "Kernel/event_queues.h"
 #include "Kernel/memory_management.h"
 #include "Libs.h"
+#include "Emulator/HLE/Libraries/LibKernel/FileSystem/file_system.h"
+#include "Emulator/HLE/Libraries/LibKernel/FileSystem/posix_file_system.h"
 
 namespace HLE::Libs::LibKernel {
 
@@ -44,6 +46,9 @@ void LibKernel_Register(SymbolsResolver* sym) {
     LIB_FUNCTION("Ou3iL1abvng", "libkernel", 1, "libkernel", 1, 1, stack_chk_fail);
     // time
     LIB_FUNCTION("-2IRUCO--PM", "libkernel", 1, "libkernel", 1, 1, sceKernelReadTsc);
+    // fs
+    LIB_FUNCTION("1G3lF1Gg1k8", "libkernel", 1, "libkernel", 1, 1, Emulator::HLE::Libraries::LibKernel::FileSystem::sceKernelOpen);
+    LIB_FUNCTION("wuCroIGjt2g", "libScePosix", 1, "libkernel", 1, 1, Emulator::HLE::Libraries::LibKernel::FileSystem::POSIX::open);
 }
 
 };  // namespace HLE::Libs::LibKernel

src/Emulator/HLE/Libraries/LibKernel/FileSystem/file_system.cpp

@@ -0,0 +1,13 @@
+#include "file_system.h"
+#include <debug.h>
+#include <Util/log.h>
+
+namespace Emulator::HLE::Libraries::LibKernel::FileSystem {
+constexpr bool log_file_fs = true;  // disable it to disable logging
+
+int PS4_SYSV_ABI sceKernelOpen(const char* path, int flags, u16 mode) { 
+	LOG_INFO_IF(log_file_fs, "sceKernelOpen path = {} flags = {} mode = {}\n", path, log_hex_full(flags), log_hex_full(mode));
+	return 0; 
+}
+
+}  // namespace Emulator::HLE::Libraries::LibKernel::FileSystem

src/Emulator/HLE/Libraries/LibKernel/FileSystem/file_system.h

@@ -0,0 +1,7 @@
+#pragma once
+#include <types.h>
+
+namespace Emulator::HLE::Libraries::LibKernel::FileSystem {
+int PS4_SYSV_ABI sceKernelOpen(const char *path, int flags, /* SceKernelMode*/ u16 mode);
+
+}

src/Emulator/HLE/Libraries/LibKernel/FileSystem/posix_file_system.cpp

@@ -0,0 +1,15 @@
+#include "posix_file_system.h"
+
+#include <debug.h>
+
+#include "file_system.h"
+
+namespace Emulator::HLE::Libraries::LibKernel::FileSystem::POSIX {
+int PS4_SYSV_ABI open(const char* path, int flags, /* SceKernelMode*/ u16 mode) {
+    int result = sceKernelOpen(path, flags, mode);
+    if (result < 0) {
+        BREAKPOINT();  // posix calls different only for their return values
+    }
+    return result;
+}
+}  // namespace Emulator::HLE::Libraries::LibKernel::FileSystem::POSIX

src/Emulator/HLE/Libraries/LibKernel/FileSystem/posix_file_system.h

@@ -0,0 +1,6 @@
+#pragma once
+#include "types.h"
+
+namespace Emulator::HLE::Libraries::LibKernel::FileSystem::POSIX {
+int PS4_SYSV_ABI open(const char *path, int flags, /* SceKernelMode*/ u16 mode);
+}