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UserspaceEmulator+LibX86: Add support for 64-bit memory reads and writes (#3584)

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This is useful for reading and writing doubles for #3329.
It is also useful for emulating 64-bit binaries.

MemoryOrRegisterReference assumes that 64-bit values are always
memory references since that's enough for fpu support. If we
ever want to emulate 64-bit binaries, that part will need minor
updating.
This commit is contained in:
Nico Weber 2020-09-23 14:45:43 -04:00 • committed by GitHub
parent 1fa5a526e8
commit f1c0f661f4
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12 changed files with 156 additions and 0 deletions
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13
DevTools/UserspaceEmulator/SimpleRegion.cpp
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@ -61,6 +61,12 @@ ValueWithShadow<u32> SimpleRegion::read32(u32 offset)
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());
@ -82,6 +88,13 @@ void SimpleRegion::write32(u32 offset, ValueWithShadow<u32> 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;