From b68ca43166be4bcb985f442db465b3fcc7d5e4ab Mon Sep 17 00:00:00 2001
From: kalaposfos13 <153381648+kalaposfos13@users.noreply.github.com>
Date: Mon, 14 Jul 2025 22:44:13 +0200
Subject: [PATCH] Implement sceKernelGetSystemSwVersion (#3243)

* Implement sceKernelGetSystemSwVersion

* Set the reported firmware version to that of the game executable
---
 src/core/libraries/kernel/kernel.cpp | 15 +++++++++++++++
 src/core/libraries/kernel/kernel.h   |  6 ++++++
 2 files changed, 21 insertions(+)

diff --git a/src/core/libraries/kernel/kernel.cpp b/src/core/libraries/kernel/kernel.cpp
index 61d2e2f2b..a4d3accac 100644
--- a/src/core/libraries/kernel/kernel.cpp
+++ b/src/core/libraries/kernel/kernel.cpp
@@ -6,6 +6,7 @@
 
 #include "common/assert.h"
 #include "common/debug.h"
+#include "common/elf_info.h"
 #include "common/logging/log.h"
 #include "common/polyfill_thread.h"
 #include "common/thread.h"
@@ -243,6 +244,19 @@ s32 PS4_SYSV_ABI sceKernelSetGPO() {
     return ORBIS_OK;
 }
 
+s32 PS4_SYSV_ABI sceKernelGetSystemSwVersion(SwVersionStruct* ret) {
+    if (ret == nullptr) {
+        return ORBIS_OK; // but why?
+    }
+    ASSERT(ret->struct_size == 40);
+    u32 fake_fw = Common::ElfInfo::Instance().RawFirmwareVer();
+    ret->hex_representation = fake_fw;
+    std::snprintf(ret->text_representation, 28, "%2x.%03x.%03x", fake_fw >> 0x18,
+                  fake_fw >> 0xc & 0xfff, fake_fw & 0xfff); // why %2x?
+    LOG_INFO(Lib_Kernel, "called, returned sw version: {}", ret->text_representation);
+    return ORBIS_OK;
+}
+
 void RegisterKernel(Core::Loader::SymbolsResolver* sym) {
     service_thread = std::jthread{KernelServiceThread};
 
@@ -258,6 +272,7 @@ void RegisterKernel(Core::Loader::SymbolsResolver* sym) {
     Libraries::Kernel::RegisterDebug(sym);
 
     LIB_OBJ("f7uOxY9mM1U", "libkernel", 1, "libkernel", 1, 1, &g_stack_chk_guard);
+    LIB_FUNCTION("Mv1zUObHvXI", "libkernel", 1, "libkernel", 1, 1, sceKernelGetSystemSwVersion);
     LIB_FUNCTION("PfccT7qURYE", "libkernel", 1, "libkernel", 1, 1, kernel_ioctl);
     LIB_FUNCTION("JGfTMBOdUJo", "libkernel", 1, "libkernel", 1, 1, sceKernelGetFsSandboxRandomWord);
     LIB_FUNCTION("6xVpy0Fdq+I", "libkernel", 1, "libkernel", 1, 1, _sigprocmask);
diff --git a/src/core/libraries/kernel/kernel.h b/src/core/libraries/kernel/kernel.h
index 0529c06d5..018759e14 100644
--- a/src/core/libraries/kernel/kernel.h
+++ b/src/core/libraries/kernel/kernel.h
@@ -35,6 +35,12 @@ struct OrbisWrapperImpl<PS4_SYSV_ABI R (*)(Args...), f> {
 
 s32* PS4_SYSV_ABI __Error();
 
+struct SwVersionStruct {
+    u64 struct_size;
+    char text_representation[0x1c];
+    u32 hex_representation;
+};
+
 void RegisterKernel(Core::Loader::SymbolsResolver* sym);
 
 } // namespace Libraries::Kernel