thermosphere: add proper memory/instruction barriers for breakpoint stuff

thermosphere/src/software_breakpoints.c

@@ -74,12 +74,14 @@ static inline bool doApplySoftwareBreakpoint(size_t id)
 static void applySoftwareBreakpointHandler(void *p)
 {
     u64 flags = maskIrq();
+    __dmb_sy();
     doApplySoftwareBreakpoint(*(size_t *)p);
     restoreInterruptFlags(flags);
 }
 
 static void applySoftwareBreakpoint(size_t id)
 {
+    __dmb_sy();
     executeFunctionOnAllCores(applySoftwareBreakpointHandler, &id, true);
 }
 
@@ -101,12 +103,14 @@ static inline bool doRevertSoftwareBreakpoint(size_t id)
 static void revertSoftwareBreakpointHandler(void *p)
 {
     u64 flags = maskIrq();
+    __dmb_sy();
     doRevertSoftwareBreakpoint(*(size_t *)p);
     restoreInterruptFlags(flags);
 }
 
 static void revertSoftwareBreakpoint(size_t id)
 {
+    __dmb_sy();
     executeFunctionOnAllCores(revertSoftwareBreakpointHandler, &id, true);
 }
 
@@ -223,4 +227,4 @@ int removeAllSoftwareBreakpoints(bool keepPersistent)
     recursiveSpinlockUnlock(&g_softwareBreakpointManager.lock);
 
     return ret;
-}
+}