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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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2
DevTools/UserspaceEmulator/ValueWithShadow.h
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@ -111,6 +111,8 @@ private:
template<typename T>
ALWAYS_INLINE ValueWithShadow<T> shadow_wrap_as_initialized(T value)
{
if constexpr (sizeof(T) == 8)
return { value, 0x01010101'01010101LLU };
if constexpr (sizeof(T) == 4)
return { value, 0x01010101 };
if constexpr (sizeof(T) == 2)