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Patch some specific CPUIDs

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This commit is contained in:
offtkp 2024-09-17 01:33:36 +03:00
parent f704ca54bf
commit 1841a78508
1 changed files with 46 additions and 5 deletions
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47
src/core/signals.cpp
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@ -17,6 +17,19 @@
#endif
#endif
// CPUID constants from http://instlatx64.atw.hu/
// There wasn't dumps for the PS4 itself, we used a Jaguar CPU: AMD A9-9820
// Optimally at some point we should dump the PS4 CPUID values
// For EAX=0 / EAX=0x80000000
constexpr static u32 maxCpuid = 0xD;
constexpr static const char* vendorId = "AuthenticAMD";
// For EAX=1
constexpr static u32 processorFamilyIDs = 0x00720F61;
constexpr static u32 additionalInfo = 0x00080800;
constexpr static u32 featureInfoEcx = 0x3ED8220B;
constexpr static u32 featureInfoEdx = 0x178BFBFF;
namespace Core {
#if defined(_WIN32)
@ -40,8 +53,22 @@ static LONG WINAPI SignalHandler(EXCEPTION_POINTERS* pExp) noexcept {
int rax = (int)(u32)pExp->ContextRecord->Rax;
int rcx = (int)(u32)pExp->ContextRecord->Rcx;
LOG_ERROR(Core, "CPUID - RAX BEFORE: 0x{:x}, RCX BEFORE: 0x{:x}", rax, rcx);
if (rax == 1) {
results[0] = processorFamilyIDs;
results[1] = additionalInfo;
results[2] = featureInfoEcx;
results[3] = featureInfoEdx;
} else {
__cpuidex(reinterpret_cast<int*>(results), static_cast<int>(rax),
static_cast<int>(rcx));
if (rax == 0 || rax == 0x80000000) {
// The order looks weird but is correct
// The string is saved in order of EBX, EDX, ECX
memcpy(&results[1], vendorId, 4);
memcpy(&results[3], vendorId + 4, 4);
memcpy(&results[2], vendorId + 8, 4);
}
}
pExp->ContextRecord->Rax = results[0];
pExp->ContextRecord->Rbx = results[1];
pExp->ContextRecord->Rcx = results[2];
@ -126,11 +153,25 @@ static void SignalHandler(int sig, siginfo_t* info, void* raw_context) {
case SIGILL: {
u8 opcode = *reinterpret_cast<u8*>(code_address);
if (opcode == 0x37) { // 0x37 is AAA instruction, we use that to patch CPUID
u64 results[4];
u64 rax = ctx->uc_mcontext.gregs[REG_RAX];
u64 rcx = ctx->uc_mcontext.gregs[REG_RCX];
u32 results[4];
int rax = ctx->uc_mcontext.gregs[REG_RAX];
int rcx = ctx->uc_mcontext.gregs[REG_RCX];
LOG_ERROR(Core, "CPUID - RAX BEFORE: 0x{:x}, RCX BEFORE: 0x{:x}", rax, rcx);
if (rax == 1) {
results[0] = processorFamilyIDs;
results[1] = additionalInfo;
results[2] = featureInfoEcx;
results[3] = featureInfoEdx;
} else {
__cpuid_count(rax, rcx, results[0], results[1], results[2], results[3]);
if (rax == 0 || rax == 0x80000000) {
// The order looks weird but is correct
// The string is saved in order of EBX, EDX, ECX
memcpy(&results[1], vendorId, 4);
memcpy(&results[3], vendorId + 4, 4);
memcpy(&results[2], vendorId + 8, 4);
}
}
ctx->uc_mcontext.gregs[REG_RAX] = results[0];
ctx->uc_mcontext.gregs[REG_RBX] = results[1];
ctx->uc_mcontext.gregs[REG_RCX] = results[2];