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Writeback results from cpuid

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This commit is contained in:
offtkp 2024-09-16 23:32:15 +03:00
parent 7d6a01cc29
commit d9027e6936
1 changed files with 18 additions and 7 deletions
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25
src/core/signals.cpp
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@ -6,8 +6,8 @@
#include "core/signals.h"
#ifdef _WIN32
#include <windows.h>
#include <intrin.h>
#include <windows.h>
#else
#include <csignal>
#include <cpuid.h>
@ -36,8 +36,17 @@ static LONG WINAPI SignalHandler(EXCEPTION_POINTERS* pExp) noexcept {
case EXCEPTION_ILLEGAL_INSTRUCTION: {
u8 opcode = *reinterpret_cast<u8*>(code_address);
if (opcode == 0x37) { // 0x37 is AAA instruction, we use that to patch CPUID
handled = EXCEPTION_CONTINUE_EXECUTION;
int results[4]; // that's the type __cpuidex expects
int rax = (int)(u32)pExp->ContextRecord->Rax;
int rcx = (int)(u32)pExp->ContextRecord->Rcx;
__cpuidex(reinterpret_cast<int*>(results), static_cast<int>(rax),
static_cast<int>(rcx));
pExp->ContextRecord->Rax = results[0];
pExp->ContextRecord->Rbx = results[1];
pExp->ContextRecord->Rcx = results[2];
pExp->ContextRecord->Rdx = results[3];
pExp->ContextRecord->Rip += 1; // skip the illegal instruction
handled = EXCEPTION_CONTINUE_EXECUTION;
} else {
handled = signals->DispatchIllegalInstruction(code_address);
}
@ -115,11 +124,13 @@ static void SignalHandler(int sig, siginfo_t* info, void* raw_context) {
u8 opcode = *reinterpret_cast<u8*>(code_address);
if (opcode == 0x37) { // 0x37 is AAA instruction, we use that to patch CPUID
u64 results[4];
u64 eax = ctx->uc_mcontext.gregs[REG_RAX];
u64 ecx = ctx->uc_mcontext.gregs[REG_RCX];
LOG_WARNING(Core, "CPUID: eax=%lx ecx=%lx\n", eax, ecx);
__cpuid_count(eax, ecx, results[0], results[1], results[2], results[3]);
LOG_WARNING(Core, "RESULTS: %lx %lx %lx %lx\n", results[0], results[1], results[2], results[3]);
u64 rax = ctx->uc_mcontext.gregs[REG_RAX];
u64 rcx = ctx->uc_mcontext.gregs[REG_RCX];
__cpuid_count(rax, rcx, results[0], results[1], results[2], results[3]);
ctx->uc_mcontext.gregs[REG_RAX] = results[0];
ctx->uc_mcontext.gregs[REG_RBX] = results[1];
ctx->uc_mcontext.gregs[REG_RCX] = results[2];
ctx->uc_mcontext.gregs[REG_RDX] = results[3];
ctx->uc_mcontext.gregs[REG_RIP] += 1; // skip the illegal instruction
break;
} else {