kern: update for new exception flag semantics

libraries/libmesosphere/source/arch/arm64/kern_cpu.cpp

@@ -38,6 +38,25 @@ namespace ams::kern::arch::arm64::cpu {
                 ALWAYS_INLINE ~KScopedCoreMigrationDisable() { GetCurrentThread().EnableCoreMigration(); }
         };
 
+        class KScopedCacheMaintenance {
+            private:
+                bool m_active;
+            public:
+                ALWAYS_INLINE KScopedCacheMaintenance() {
+                    __asm__ __volatile__("" ::: "memory");
+                    if (m_active = !GetCurrentThread().IsInCacheMaintenanceOperation(); m_active) {
+                        GetCurrentThread().SetInCacheMaintenanceOperation();
+                    }
+                }
+
+                ALWAYS_INLINE ~KScopedCacheMaintenance() {
+                    if (m_active) {
+                        GetCurrentThread().ClearInCacheMaintenanceOperation();
+                    }
+                    __asm__ __volatile__("" ::: "memory");
+                }
+        };
+
         /* Nintendo registers a handler for a SGI on thread termination, but does not handle anything. */
         /* This is sufficient, because post-interrupt scheduling is all they really intend to occur. */
         class KThreadTerminationInterruptHandler : public KInterruptHandler {
@@ -432,9 +451,7 @@ namespace ams::kern::arch::arm64::cpu {
 
     Result InvalidateDataCache(void *addr, size_t size) {
         /* Mark ourselves as in a cache maintenance operation, and prevent re-ordering. */
-        __asm__ __volatile__("" ::: "memory");
+        KScopedCacheMaintenance cm;
-        GetCurrentThread().SetInCacheMaintenanceOperation();
-        ON_SCOPE_EXIT { GetCurrentThread().ClearInCacheMaintenanceOperation(); __asm__ __volatile__("" ::: "memory"); };
 
         const uintptr_t start = reinterpret_cast<uintptr_t>(addr);
         const uintptr_t end   = start + size;
@@ -460,9 +477,7 @@ namespace ams::kern::arch::arm64::cpu {
 
     Result StoreDataCache(const void *addr, size_t size) {
         /* Mark ourselves as in a cache maintenance operation, and prevent re-ordering. */
-        __asm__ __volatile__("" ::: "memory");
+        KScopedCacheMaintenance cm;
-        GetCurrentThread().SetInCacheMaintenanceOperation();
-        ON_SCOPE_EXIT { GetCurrentThread().ClearInCacheMaintenanceOperation(); __asm__ __volatile__("" ::: "memory"); };
 
         const uintptr_t start = util::AlignDown(reinterpret_cast<uintptr_t>(addr),        DataCacheLineSize);
         const uintptr_t end   = util::AlignUp(  reinterpret_cast<uintptr_t>(addr) + size, DataCacheLineSize);
@@ -472,9 +487,7 @@ namespace ams::kern::arch::arm64::cpu {
 
     Result FlushDataCache(const void *addr, size_t size) {
         /* Mark ourselves as in a cache maintenance operation, and prevent re-ordering. */
-        __asm__ __volatile__("" ::: "memory");
+        KScopedCacheMaintenance cm;
-        GetCurrentThread().SetInCacheMaintenanceOperation();
-        ON_SCOPE_EXIT { GetCurrentThread().ClearInCacheMaintenanceOperation(); __asm__ __volatile__("" ::: "memory"); };
 
         const uintptr_t start = util::AlignDown(reinterpret_cast<uintptr_t>(addr),        DataCacheLineSize);
         const uintptr_t end   = util::AlignUp(  reinterpret_cast<uintptr_t>(addr) + size, DataCacheLineSize);

libraries/libmesosphere/source/arch/arm64/svc/kern_svc_exception_asm.s

@@ -86,9 +86,10 @@ _ZN3ams4kern3svc14RestoreContextEm:
     /* Get our exception flags. */
     ldrb    w9, [sp, #(EXCEPTION_CONTEXT_SIZE + THREAD_STACK_PARAMETERS_EXCEPTION_FLAGS)]
 
-    /* Clear in-svc and needs-fpu-restore flags. */
+    /* Clear in-svc, in-user-exception, and needs-fpu-restore flags. */
     and     w10, w9,  #(~(THREAD_EXCEPTION_FLAG_IS_FPU_CONTEXT_RESTORE_NEEDED))
     and     w10, w10, #(~(THREAD_EXCEPTION_FLAG_IS_CALLING_SVC))
+    and     w10, w10, #(~(THREAD_EXCEPTION_FLAG_IS_IN_USERMODE_EXCEPTION_HANDLER))
     strb    w10, [sp, #(EXCEPTION_CONTEXT_SIZE + THREAD_STACK_PARAMETERS_EXCEPTION_FLAGS)]
 
     /* If we don't need to restore the fpu, skip restoring it. */

libraries/libmesosphere/source/kern_k_thread.cpp

@@ -509,7 +509,8 @@ namespace ams::kern {
 
     void KThread::OnLeaveUsermodeException() {
         this->ClearUsermodeExceptionSvcPermissions();
-        this->ClearInUsermodeExceptionHandler();
+
+        /* NOTE: InUsermodeExceptionHandler will be cleared by RestoreContext. */
     }
 
     void KThread::Pin() {

libraries/libvapours/include/vapours/svc/svc_version.hpp

@@ -57,7 +57,7 @@ namespace ams::svc {
 
     /* This is the highest SVC version supported by Atmosphere, to be updated on new kernel releases. */
     /* NOTE: Official kernel versions have SVC major = SDK major + 4, SVC minor = SDK minor. */
-    constexpr inline u32 SupportedKernelMajorVersion = ConvertToSvcMajorVersion(14);
+    constexpr inline u32 SupportedKernelMajorVersion = ConvertToSvcMajorVersion(15);
     constexpr inline u32 SupportedKernelMinorVersion = ConvertToSvcMinorVersion( 3);
 
     constexpr inline u32 SupportedKernelVersion = EncodeKernelVersion(SupportedKernelMajorVersion, SupportedKernelMinorVersion);