1 files changed, 78 insertions, 0 deletions
diff --git a/Userland/DevTools/UserspaceEmulator/MmapRegion.h b/Userland/DevTools/UserspaceEmulator/MmapRegion.h
new file mode 100644
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+++ b/Userland/DevTools/UserspaceEmulator/MmapRegion.h
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+/*
+ * 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.
+ */
+
+#pragma once
+
+#include "SoftMMU.h"
+#include <sys/mman.h>
+
+namespace UserspaceEmulator {
+
+class MallocRegionMetadata;
+class MallocTracer;
+
+class MmapRegion final : public Region {
+public:
+    static NonnullOwnPtr<MmapRegion> create_anonymous(u32 base, u32 size, u32 prot);
+    static NonnullOwnPtr<MmapRegion> create_file_backed(u32 base, u32 size, u32 prot, int flags, int fd, off_t offset, String name = {});
+    virtual ~MmapRegion() override;
+
+    virtual ValueWithShadow<u8> read8(u32 offset) override;
+    virtual ValueWithShadow<u16> read16(u32 offset) override;
+    virtual ValueWithShadow<u32> read32(u32 offset) override;
+    virtual ValueWithShadow<u64> read64(u32 offset) override;
+
+    virtual void write8(u32 offset, ValueWithShadow<u8>) override;
+    virtual void write16(u32 offset, ValueWithShadow<u16>) override;
+    virtual void write32(u32 offset, ValueWithShadow<u32>) override;
+    virtual void write64(u32 offset, ValueWithShadow<u64>) override;
+
+    virtual u8* data() override { return m_data; }
+    virtual u8* shadow_data() override { return m_shadow_data; }
+
+    bool is_malloc_block() const { return m_malloc; }
+    void set_malloc(bool b) { m_malloc = b; }
+
+    void set_prot(int prot);
+
+    MallocRegionMetadata* malloc_metadata() { return m_malloc_metadata; }
+    void set_malloc_metadata(Badge<MallocTracer>, NonnullOwnPtr<MallocRegionMetadata> metadata) { m_malloc_metadata = move(metadata); }
+
+    const String& name() const { return m_name; }
+
+private:
+    MmapRegion(u32 base, u32 size, int prot);
+
+    u8* m_data { nullptr };
+    u8* m_shadow_data { nullptr };
+    bool m_file_backed { false };
+    bool m_malloc { false };
+
+    OwnPtr<MallocRegionMetadata> m_malloc_metadata;
+    String m_name;
+};
+
+}