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Add rdtscp instruction with stub IA32_TSC_AUX values (#256)

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This functionality mirrors RDTSC calls but returns a stub IA32_TSC_AUX
value. However, it requires further work to correctly retrieve the CPUID
in multi-threaded contexts before setting `RCX`.
This commit is contained in:
Maurice Heumann
2025-05-02 07:39:03 +02:00
committed by GitHub
parent 88080e97c7 cff2feee75
commit a2ce0e3444
1 changed files with 12 additions and 0 deletions
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12
src/windows-emulator/windows_emulator.cpp
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@@ -498,6 +498,18 @@ void windows_emulator::setup_hooks()
return instruction_hook_continuation::skip_instruction;
});
this->emu().hook_instruction(x86_hookable_instructions::rdtscp, [&] {
const auto ticks = this->clock_->timestamp_counter();
this->emu().reg(x86_register::rax, ticks & 0xFFFFFFFF);
this->emu().reg(x86_register::rdx, (ticks >> 32) & 0xFFFFFFFF);
// Return the IA32_TSC_AUX value in RCX (low 32 bits)
auto tsc_aux = 0; // Need to replace this with proper CPUID later
this->emu().reg(x86_register::rcx, tsc_aux);
return instruction_hook_continuation::skip_instruction;
});
this->emu().hook_instruction(x86_hookable_instructions::rdtsc, [&] {
const auto ticks = this->clock_->timestamp_counter();
this->emu().reg(x86_register::rax, ticks & 0xFFFFFFFF);