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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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22
DevTools/UserspaceEmulator/SoftMMU.cpp
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@ -97,6 +97,17 @@ ValueWithShadow<u32> SoftMMU::read32(X86::LogicalAddress address)
return region->read32(address.offset() - region->base());
}
ValueWithShadow<u64> SoftMMU::read64(X86::LogicalAddress address)
{
auto* region = find_region(address);
if (!region) {
warn() << "SoftMMU::read64: No region for @" << (const void*)address.offset();
TODO();
}
return region->read64(address.offset() - region->base());
}
void SoftMMU::write8(X86::LogicalAddress address, ValueWithShadow<u8> value)
{
auto* region = find_region(address);
@ -130,6 +141,17 @@ void SoftMMU::write32(X86::LogicalAddress address, ValueWithShadow<u32> value)
region->write32(address.offset() - region->base(), value);
}
void SoftMMU::write64(X86::LogicalAddress address, ValueWithShadow<u64> value)
{
auto* region = find_region(address);
if (!region) {
warn() << "SoftMMU::write64: No region for @" << (const void*)address.offset();
TODO();
}
region->write64(address.offset() - region->base(), value);
}
void SoftMMU::copy_to_vm(FlatPtr destination, const void* source, size_t size)
{
// FIXME: We should have a way to preserve the shadow data here as well.