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

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.

1 files changed, 13 insertions, 0 deletions

diff --git a/DevTools/UserspaceEmulator/SimpleRegion.cpp b/DevTools/UserspaceEmulator/SimpleRegion.cpp
index cf5d2ee88c..173efd0e32 100644
--- a/DevTools/UserspaceEmulator/SimpleRegion.cpp
+++ b/DevTools/UserspaceEmulator/SimpleRegion.cpp
@@ -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;