thermosphere: mostly rewrite sw breakpoint manager

thermosphere/src/hvisor_sw_breakpoint_manager.hpp

@@ -0,0 +1,69 @@
+/*
+ * Copyright (c) 2019-2020 Atmosphère-NX
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include "defines.hpp"
+#include "hvisor_synchronization.hpp"
+
+#define MAX_SW_BREAKPOINTS  16
+
+namespace ams::hvisor {
+
+    class SwBreakpointManager {
+        NON_COPYABLE(SwBreakpointManager);
+        NON_MOVEABLE(SwBreakpointManager);
+        private:
+            struct Breakpoint {
+                uintptr_t address;
+                u32 savedInstruction;
+                u16 uid;
+                bool persistent;
+                bool applied;
+            };
+
+        private:
+            static SwBreakpointManager instance;
+        private:
+            mutable RecursiveSpinlock m_lock{};
+            std::atomic<bool> m_triedToApplyOrRevertBreakpoint{};
+
+            u32 m_bpUniqueCounter = 0;
+            size_t m_numBreakpoints = 0;
+            std::array<Breakpoint, MAX_SW_BREAKPOINTS> m_breakpoints{};
+
+        private:
+            size_t FindClosest(uintptr_t addr) const;
+
+            bool DoApply(size_t id);
+            bool DoRevert(size_t id);
+
+            // TODO apply, revert handler
+            bool Apply(size_t id);
+            bool Revert(size_t id);
+
+        public:
+            static SwBreakpointManager &GetInstance() { return instance; }
+
+        public:
+            int Add(uintptr_t addr, bool persistent);
+            int Remove(uintptr_t addr, bool keepPersistent);
+            int RemoveAll(bool keepPersistent);
+
+        public: 
+            constexpr SwBreakpointManager() = default;
+    };
+}