sm: update to excise unnecessary library code

libraries/config/templates/stratosphere.mk

@@ -34,7 +34,8 @@ export CXXWRAPS := -Wl,--wrap,__cxa_pure_virtual \
 			-Wl,--wrap,_Unwind_Resume \
 			-Wl,--wrap,_ZSt19__throw_logic_errorPKc \
 			-Wl,--wrap,_ZSt20__throw_length_errorPKc \
-			-Wl,--wrap,_ZNSt11logic_errorC2EPKc
+			-Wl,--wrap,_ZNSt11logic_errorC2EPKc \
+			-Wl,--wrap,exit
 
 export LDFLAGS     = -specs=$(ATMOSPHERE_LIBRARIES_DIR)/libstratosphere/stratosphere.specs -specs=$(DEVKITPRO)/libnx/switch.specs $(SETTINGS) $(CXXWRAPS) -Wl,-Map,$(notdir $*.map)
 

libraries/libstratosphere/Makefile

@@ -124,6 +124,7 @@ $(OFILES_SRC)	: $(HFILES_BIN)
 
 ams_environment_weak.o: CXXFLAGS += -fno-lto
 pm_info_api_weak.o: CXXFLAGS += -fno-lto
+hos_stratosphere_api.o: CXXFLAGS += -fno-lto
 
 #---------------------------------------------------------------------------------
 %_bin.h %.bin.o	:	%.bin

libraries/libstratosphere/source/ams/ams_environment_weak.cpp

@@ -15,6 +15,8 @@
  */
 #include <stratosphere.hpp>
 
+extern "C" void NORETURN __real_exit(int rc);
+
 namespace ams {
 
     WEAK_SYMBOL void *Malloc(size_t size) {
@@ -37,6 +39,11 @@ namespace ams {
         return std::free(ptr);
     }
 
+    WEAK_SYMBOL void NORETURN Exit(int rc) {
+        __real_exit(rc);
+        __builtin_unreachable();
+    }
+
 }
 
 extern "C" {
@@ -46,4 +53,6 @@ extern "C" {
     WRAP_ABORT_FUNC(__cxa_pure_virtual)
     #undef WRAP_ABORT_FUNC
 
+    void NORETURN __wrap_exit(int rc) { ::ams::Exit(rc); __builtin_unreachable(); }
+
 }

libraries/libstratosphere/source/hos/hos_stratosphere_api.cpp

@@ -15,6 +15,7 @@
  */
 #include <stratosphere.hpp>
 #include "hos_version_api_private.hpp"
+#include "../os/impl/os_rng_manager.hpp"
 
 namespace ams::os {
 
@@ -22,6 +23,15 @@ namespace ams::os {
 
 }
 
+extern "C" {
+
+    /* Provide libnx address space allocation shim. */
+    uintptr_t __libnx_virtmem_rng(void) {
+        return static_cast<uintptr_t>(::ams::os::impl::GetRngManager().GenerateRandomU64());
+    }
+
+}
+
 namespace ams::hos {
 
     void InitializeForStratosphere() {

libraries/libstratosphere/source/os/impl/os_rng_manager_impl.hpp

@@ -21,12 +21,12 @@ namespace ams::os::impl {
     class RngManager {
         private:
             util::TinyMT mt;
-            os::Mutex lock;
+            os::SdkMutex lock;
             bool initialized;
         private:
             void Initialize();
         public:
-            constexpr RngManager() : mt(), lock(false), initialized() { /* ... */ }
+            constexpr RngManager() : mt(), lock(), initialized() { /* ... */ }
         public:
             u64 GenerateRandomU64();
     };

libraries/libstratosphere/source/os/os_random.cpp

@@ -20,9 +20,9 @@ namespace ams::os {
 
     namespace {
 
-        util::TinyMT g_random;
-        os::Mutex g_random_mutex(false);
-        bool g_initialized_random;
+        constinit util::TinyMT g_random;
+        constinit os::SdkMutex g_random_mutex;
+        constinit bool g_initialized_random;
 
         template<typename T>
         inline T GenerateRandomTImpl(T max) {

stratosphere/sm/source/sm_main.cpp

@@ -19,6 +19,9 @@
 extern "C" {
     extern u32 __start__;
 
+    extern int __system_argc;
+    extern char** __system_argv;
+
     u32 __nx_applet_type = AppletType_None;
 
     #define INNER_HEAP_SIZE 0x0
@@ -26,6 +29,7 @@ extern "C" {
     char   nx_inner_heap[INNER_HEAP_SIZE];
 
     void __libnx_initheap(void);
+    void argvSetup(void);
     void __appInit(void);
     void __appExit(void);
 
@@ -39,10 +43,20 @@ extern "C" {
     void __libnx_free(void *mem);
 }
 
+namespace {
+
+    constinit char *g_empty_argv = nullptr;
+
+}
+
 namespace ams {
 
     ncm::ProgramId CurrentProgramId = ncm::SystemProgramId::Sm;
 
+    void NORETURN Exit(int rc) {
+        AMS_ABORT("Exit called by immortal process");
+    }
+
 }
 
 using namespace ams;
@@ -64,6 +78,12 @@ void __libnx_initheap(void) {
     fake_heap_end   = (char*)addr + size;
 }
 
+void argvSetup(void) {
+    /* We don't need argc/argv, so set them to empty defaults. */
+    __system_argc = 0;
+    __system_argv = std::addressof(g_empty_argv);
+}
+
 void __appInit(void) {
     hos::InitializeForStratosphere();