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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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19
DevTools/UserspaceEmulator/SoftCPU.cpp
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@ -158,6 +158,16 @@ ValueWithShadow<u32> SoftCPU::read_memory32(X86::LogicalAddress address)
return value;
}
ValueWithShadow<u64> SoftCPU::read_memory64(X86::LogicalAddress address)
{
ASSERT(address.selector() == 0x18 || address.selector() == 0x20 || address.selector() == 0x28);
auto value = m_emulator.mmu().read64(address);
#ifdef MEMORY_DEBUG
printf("\033[36;1mread_memory64: @%04x:%08x -> %016llx (%016llx)\033[0m\n", address.selector(), address.offset(), value.value(), value.shadow());
#endif
return value;
}
void SoftCPU::write_memory8(X86::LogicalAddress address, ValueWithShadow<u8> value)
{
ASSERT(address.selector() == 0x20 || address.selector() == 0x28);
@ -185,6 +195,15 @@ void SoftCPU::write_memory32(X86::LogicalAddress address, ValueWithShadow<u32> v
m_emulator.mmu().write32(address, value);
}
void SoftCPU::write_memory64(X86::LogicalAddress address, ValueWithShadow<u64> value)
{
ASSERT(address.selector() == 0x20 || address.selector() == 0x28);
#ifdef MEMORY_DEBUG
printf("\033[35;1mwrite_memory64: @%04x:%08x <- %016llx (%016llx)\033[0m\n", address.selector(), address.offset(), value.value(), value.shadow());
#endif
m_emulator.mmu().write64(address, value);
}
void SoftCPU::push_string(const StringView& string)
{
size_t space_to_allocate = round_up_to_power_of_two(string.length() + 1, 16);