1 files changed, 103 insertions, 0 deletions
diff --git a/Userland/DevTools/UserspaceEmulator/SimpleRegion.cpp b/Userland/DevTools/UserspaceEmulator/SimpleRegion.cpp
new file mode 100644
index 0000000000..173efd0e32
--- /dev/null
+++ b/Userland/DevTools/UserspaceEmulator/SimpleRegion.cpp
@@ -0,0 +1,103 @@
+/*
+ * Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "SimpleRegion.h"
+#include <string.h>
+
+namespace UserspaceEmulator {
+
+SimpleRegion::SimpleRegion(u32 base, u32 size)
+    : Region(base, size)
+{
+    m_data = (u8*)calloc(1, size);
+    m_shadow_data = (u8*)malloc(size);
+    memset(m_shadow_data, 1, size);
+}
+
+SimpleRegion::~SimpleRegion()
+{
+    free(m_shadow_data);
+    free(m_data);
+}
+
+ValueWithShadow<u8> SimpleRegion::read8(FlatPtr offset)
+{
+    ASSERT(offset < size());
+    return { *reinterpret_cast<const u8*>(m_data + offset), *reinterpret_cast<const u8*>(m_shadow_data + offset) };
+}
+
+ValueWithShadow<u16> SimpleRegion::read16(u32 offset)
+{
+    ASSERT(offset + 1 < size());
+    return { *reinterpret_cast<const u16*>(m_data + offset), *reinterpret_cast<const u16*>(m_shadow_data + offset) };
+}
+
+ValueWithShadow<u32> SimpleRegion::read32(u32 offset)
+{
+    ASSERT(offset + 3 < size());
+    return { *reinterpret_cast<const u32*>(m_data + offset), *reinterpret_cast<const u32*>(m_shadow_data + offset) };
+}
+
+ValueWithShadow<u64> SimpleRegion::read64(u32 offset)
+{
+    ASSERT(offset + 7 < size());
+    return { *reinterpret_cast<const u64*>(m_data + offset), *reinterpret_cast<const u64*>(m_shadow_data + offset) };
+}
+
+void SimpleRegion::write8(u32 offset, ValueWithShadow<u8> value)
+{
+    ASSERT(offset < size());
+    *reinterpret_cast<u8*>(m_data + offset) = value.value();
+    *reinterpret_cast<u8*>(m_shadow_data + offset) = value.shadow();
+}
+
+void SimpleRegion::write16(u32 offset, ValueWithShadow<u16> value)
+{
+    ASSERT(offset + 1 < size());
+    *reinterpret_cast<u16*>(m_data + offset) = value.value();
+    *reinterpret_cast<u16*>(m_shadow_data + offset) = value.shadow();
+}
+
+void SimpleRegion::write32(u32 offset, ValueWithShadow<u32> value)
+{
+    ASSERT(offset + 3 < size());
+    *reinterpret_cast<u32*>(m_data + offset) = value.value();
+    *reinterpret_cast<u32*>(m_shadow_data + offset) = value.shadow();
+}
+
+void SimpleRegion::write64(u32 offset, ValueWithShadow<u64> value)
+{
+    ASSERT(offset + 7 < size());
+    *reinterpret_cast<u64*>(m_data + offset) = value.value();
+    *reinterpret_cast<u64*>(m_shadow_data + offset) = value.shadow();
+}
+
+u8* SimpleRegion::cacheable_ptr(u32 offset)
+{
+    return m_data + offset;
+}
+
+}