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UserpaceEmulator: Handle possibly unaligned IO

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We also should add some UB warnings for that in the future
This commit is contained in:
Hendiadyoin1 2021-07-13 17:18:39 +02:00 • committed by Ali Mohammad Pur
parent d761c5024b
commit 54c005754a
3 changed files with 85 additions and 41 deletions
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58
Userland/DevTools/UserspaceEmulator/SimpleRegion.cpp
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@ -5,6 +5,7 @@
*/
#include "SimpleRegion.h"
#include <AK/ByteReader.h>
#include <string.h>
namespace UserspaceEmulator {
@ -26,77 +27,98 @@ SimpleRegion::~SimpleRegion()
ValueWithShadow<u8> SimpleRegion::read8(FlatPtr offset)
{
VERIFY(offset < size());
return { *reinterpret_cast<const u8*>(m_data + offset), *reinterpret_cast<const u8*>(m_shadow_data + offset) };
return { m_data[offset], m_shadow_data[offset] };
}
ValueWithShadow<u16> SimpleRegion::read16(u32 offset)
{
VERIFY(offset + 1 < size());
return { *reinterpret_cast<const u16*>(m_data + offset), *reinterpret_cast<const u16*>(m_shadow_data + offset) };
u16 value, shadow;
ByteReader::load<u16>(m_data + offset, value);
ByteReader::load<u16>(m_shadow_data + offset, shadow);
return { value, shadow };
}
ValueWithShadow<u32> SimpleRegion::read32(u32 offset)
{
VERIFY(offset + 3 < size());
return { *reinterpret_cast<const u32*>(m_data + offset), *reinterpret_cast<const u32*>(m_shadow_data + offset) };
u32 value, shadow;
ByteReader::load<u32>(m_data + offset, value);
ByteReader::load<u32>(m_shadow_data + offset, shadow);
return { value, shadow };
}
ValueWithShadow<u64> SimpleRegion::read64(u32 offset)
{
VERIFY(offset + 7 < size());
return { *reinterpret_cast<const u64*>(m_data + offset), *reinterpret_cast<const u64*>(m_shadow_data + offset) };
u64 value, shadow;
ByteReader::load<u64>(m_data + offset, value);
ByteReader::load<u64>(m_shadow_data + offset, shadow);
return { value, shadow };
}
ValueWithShadow<u128> SimpleRegion::read128(u32 offset)
{
VERIFY(offset + 15 < size());
return { *reinterpret_cast<const u128*>(m_data + offset), *reinterpret_cast<const u128*>(m_shadow_data + offset) };
u128 value, shadow;
ByteReader::load(m_data + offset, value);
ByteReader::load(m_shadow_data + offset, shadow);
return { value, shadow };
}
ValueWithShadow<u256> SimpleRegion::read256(u32 offset)
{
VERIFY(offset + 31 < size());
return { *reinterpret_cast<const u256*>(m_data + offset), *reinterpret_cast<const u256*>(m_shadow_data + offset) };
u256 value, shadow;
ByteReader::load(m_data + offset, value);
ByteReader::load(m_shadow_data + offset, shadow);
return { value, shadow };
}
void SimpleRegion::write8(u32 offset, ValueWithShadow<u8> value)
{
VERIFY(offset < size());
*reinterpret_cast<u8*>(m_data + offset) = value.value();
*reinterpret_cast<u8*>(m_shadow_data + offset) = value.shadow();
m_data[offset] = value.value();
m_shadow_data[offset] = value.shadow();
}
void SimpleRegion::write16(u32 offset, ValueWithShadow<u16> value)
{
VERIFY(offset + 1 < size());
*reinterpret_cast<u16*>(m_data + offset) = value.value();
*reinterpret_cast<u16*>(m_shadow_data + offset) = value.shadow();
ByteReader::store(m_data + offset, value.value());
ByteReader::store(m_shadow_data + offset, value.shadow());
}
void SimpleRegion::write32(u32 offset, ValueWithShadow<u32> value)
{
VERIFY(offset + 3 < size());
*reinterpret_cast<u32*>(m_data + offset) = value.value();
*reinterpret_cast<u32*>(m_shadow_data + offset) = value.shadow();
ByteReader::store(m_data + offset, value.value());
ByteReader::store(m_shadow_data + offset, value.shadow());
}
void SimpleRegion::write64(u32 offset, ValueWithShadow<u64> value)
{
VERIFY(offset + 7 < size());
*reinterpret_cast<u64*>(m_data + offset) = value.value();
*reinterpret_cast<u64*>(m_shadow_data + offset) = value.shadow();
ByteReader::store(m_data + offset, value.value());
ByteReader::store(m_shadow_data + offset, value.shadow());
}
void SimpleRegion::write128(u32 offset, ValueWithShadow<u128> value)
{
VERIFY(offset + 15 < size());
*reinterpret_cast<u128*>(m_data + offset) = value.value();
*reinterpret_cast<u128*>(m_shadow_data + offset) = value.shadow();
ByteReader::store(m_data + offset, value.value());
ByteReader::store(m_shadow_data + offset, value.shadow());
}
void SimpleRegion::write256(u32 offset, ValueWithShadow<u256> value)
{
VERIFY(offset + 31 < size());
*reinterpret_cast<u256*>(m_data + offset) = value.value();
*reinterpret_cast<u256*>(m_shadow_data + offset) = value.shadow();
ByteReader::store(m_data + offset, value.value());
ByteReader::store(m_shadow_data + offset, value.shadow());
}
u8* SimpleRegion::cacheable_ptr(u32 offset)