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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.
- */
- #include "SharedBufferRegion.h"
- #include "Emulator.h"
- #include <Kernel/API/Syscall.h>
- #include <serenity.h>
- #include <string.h>
- #include <sys/mman.h>
- namespace UserspaceEmulator {
- NonnullOwnPtr<SharedBufferRegion> SharedBufferRegion::create_with_shbuf_id(u32 base, u32 size, int shbuf_id, u8* host_data)
- {
- return adopt_own(*new SharedBufferRegion(base, size, shbuf_id, host_data));
- }
- SharedBufferRegion::SharedBufferRegion(u32 base, u32 size, int shbuf_id, u8* host_data)
- : Region(base, size)
- , m_data(host_data)
- , m_shbuf_id(shbuf_id)
- {
- m_shadow_data = (u8*)malloc(size);
- memset(m_shadow_data, 1, size);
- }
- SharedBufferRegion::~SharedBufferRegion()
- {
- free(m_shadow_data);
- }
- ValueWithShadow<u8> SharedBufferRegion::read8(FlatPtr offset)
- {
- ASSERT(offset < size());
- return { *reinterpret_cast<const u8*>(m_data + offset), *reinterpret_cast<const u8*>(m_shadow_data + offset) };
- }
- ValueWithShadow<u16> SharedBufferRegion::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> SharedBufferRegion::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> SharedBufferRegion::read64(u32 offset)
- {
- ASSERT(offset + 7 < size());
- return { *reinterpret_cast<const u64*>(m_data + offset), *reinterpret_cast<const u64*>(m_shadow_data + offset) };
- }
- void SharedBufferRegion::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 SharedBufferRegion::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 SharedBufferRegion::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 SharedBufferRegion::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();
- }
- int SharedBufferRegion::allow_pid(pid_t pid)
- {
- return syscall(SC_shbuf_allow_pid, m_shbuf_id, pid);
- }
- int SharedBufferRegion::release()
- {
- return syscall(SC_shbuf_release, m_shbuf_id);
- }
- }
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