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UserspaceEmulator: Support the first two levels of CPUID

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GCC uses these when deciding which memcpy implementation to use.
This commit is contained in:
Andreas Kling 2020-11-08 22:47:02 +01:00
parent fc948ea3df
commit 9af1a4b9b1
1 changed files with 24 additions and 1 deletions
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25
DevTools/UserspaceEmulator/SoftCPU.cpp
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@ -1301,7 +1301,30 @@ void SoftCPU::CMPXCHG_RM8_reg8(const X86::Instruction& insn)
}
}
void SoftCPU::CPUID(const X86::Instruction&) { TODO_INSN(); }
void SoftCPU::CPUID(const X86::Instruction&)
{
if (eax().value() == 0) {
set_eax(shadow_wrap_as_initialized<u32>(1));
set_ebx(shadow_wrap_as_initialized<u32>(0x6c6c6548));
set_edx(shadow_wrap_as_initialized<u32>(0x6972466f));
set_ecx(shadow_wrap_as_initialized<u32>(0x73646e65));
return;
}
if (eax().value() == 1) {
u32 stepping = 0;
u32 model = 1;
u32 family = 3;
u32 type = 0;
set_eax(shadow_wrap_as_initialized<u32>(stepping | (model << 4) | (family << 8) | (type << 12)));
set_ebx(shadow_wrap_as_initialized<u32>(0));
set_edx(shadow_wrap_as_initialized<u32>((1 << 15))); // Features (CMOV)
set_ecx(shadow_wrap_as_initialized<u32>(0));
return;
}
dbgln("Unhandled CPUID with eax={:08x}", eax().value());
}
void SoftCPU::CWD(const X86::Instruction&)
{