thermosphere: hw breakpoint/watchpoint managers

thermosphere/src/hvisor_hw_breakpoint_manager.cpp

@@ -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/>.
+ */
+
+#include "hvisor_hw_breakpoint_manager.hpp"
+#include "cpu/hvisor_cpu_instructions.hpp"
+
+#define _REENT_ONLY
+#include <cerrno>
+
+namespace ams::hvisor {
+
+    HwBreakpointManager HwBreakpointManager::instance{};
+
+    void HwBreakpointManager::ReloadOnAllCoresSgiHandler()
+    {
+        // TODO
+    }
+
+    void HwBreakpointManager::ReloadOnAllCores() const
+    {
+        cpu::dmb();
+        // TODO
+    }
+
+    bool HwBreakpointManager::FindPredicate(const cpu::DebugRegisterPair &pair, uintptr_t addr, size_t, cpu::DebugRegisterPair::LoadStoreControl) const
+    {
+        return pair.vr == addr;
+    }
+
+    // Note: A32/T32/T16 support intentionnally left out
+    // Note: addresses are supposed to be well-formed regarding the sign extension bits
+    int HwBreakpointManager::Add(uintptr_t addr)
+    {
+        // Reject misaligned addresses
+        if (addr & 3) {
+            return -EINVAL;
+        }
+
+        cpu::DebugRegisterPair bp{};
+        bp.cr.bt = cpu::DebugRegisterPair::AddressMatch;
+        bp.cr.bas = 0xF; // mandated
+        bp.vr = addr;
+
+        return AddImpl(addr, 0, bp);
+    }
+
+    int HwBreakpointManager::Remove(uintptr_t addr)
+    {
+        // Reject misaligned addresses
+        if (addr & 3) {
+            return -EINVAL;
+        }
+
+        return RemoveImpl(addr, 0, cpu::DebugRegisterPair::NotAWatchpoint);
+    }
+}