mirror of
https://github.com/hrydgard/ppsspp.git
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0a13c78788
This reverts commit b173e0f4a4.
Turns out it's not actually known to fix anything, should have closed
that old PR.
320 lines
9.3 KiB
C++
320 lines
9.3 KiB
C++
// Copyright (C) 2020 PPSSPP Project
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, version 2.0 or later versions.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License 2.0 for more details.
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// A copy of the GPL 2.0 should have been included with the program.
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// If not, see http://www.gnu.org/licenses/
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// Official git repository and contact information can be found at
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// https://github.com/hrydgard/ppsspp and http://www.ppsspp.org/.
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#include "ppsspp_config.h"
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#include <cstdint>
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#include <unordered_set>
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#include <mutex>
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#include "Common/MachineContext.h"
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#if PPSSPP_ARCH(AMD64) || PPSSPP_ARCH(X86)
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#include "Common/x64Analyzer.h"
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#elif PPSSPP_ARCH(ARM64)
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#include "Core/Util/DisArm64.h"
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#elif PPSSPP_ARCH(ARM)
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#include "ext/disarm.h"
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#endif
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#include "Common/Log.h"
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#include "Core/Config.h"
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#include "Core/Core.h"
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#include "Core/MemFault.h"
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#include "Core/MemMap.h"
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#include "Core/MIPS/JitCommon/JitCommon.h"
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namespace Memory {
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static int64_t g_numReportedBadAccesses = 0;
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const uint8_t *g_lastCrashAddress;
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MemoryExceptionType g_lastMemoryExceptionType;
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static bool inCrashHandler = false;
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std::unordered_set<const uint8_t *> g_ignoredAddresses;
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void MemFault_Init() {
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g_numReportedBadAccesses = 0;
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g_lastCrashAddress = nullptr;
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g_lastMemoryExceptionType = MemoryExceptionType::NONE;
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g_ignoredAddresses.clear();
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}
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bool MemFault_MayBeResumable() {
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return g_lastCrashAddress != nullptr;
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}
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void MemFault_IgnoreLastCrash() {
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g_ignoredAddresses.insert(g_lastCrashAddress);
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}
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#ifdef MACHINE_CONTEXT_SUPPORTED
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static bool DisassembleNativeAt(const uint8_t *codePtr, int instructionSize, std::string *dest) {
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#if PPSSPP_ARCH(AMD64) || PPSSPP_ARCH(X86)
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auto lines = DisassembleX86(codePtr, instructionSize);
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if (!lines.empty()) {
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*dest = lines[0];
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return true;
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}
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#elif PPSSPP_ARCH(ARM64)
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auto lines = DisassembleArm64(codePtr, instructionSize);
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if (!lines.empty()) {
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*dest = lines[0];
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return true;
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}
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#elif PPSSPP_ARCH(ARM)
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auto lines = DisassembleArm2(codePtr, instructionSize);
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if (!lines.empty()) {
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*dest = lines[0];
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return true;
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}
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#elif PPSSPP_ARCH(RISCV64)
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auto lines = DisassembleRV64(codePtr, instructionSize);
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if (!lines.empty()) {
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*dest = lines[0];
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return true;
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}
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#endif
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return false;
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}
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bool HandleFault(uintptr_t hostAddress, void *ctx) {
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if (inCrashHandler)
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return false;
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inCrashHandler = true;
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SContext *context = (SContext *)ctx;
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const uint8_t *codePtr = (uint8_t *)(context->CTX_PC);
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std::lock_guard<std::recursive_mutex> guard(MIPSComp::jitLock);
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// We set this later if we think it can be resumed from.
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g_lastCrashAddress = nullptr;
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// TODO: Check that codePtr is within the current JIT space.
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bool inJitSpace = MIPSComp::jit && MIPSComp::jit->CodeInRange(codePtr);
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if (!inJitSpace) {
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// This is a crash in non-jitted code. Not something we want to handle here, ignore.
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inCrashHandler = false;
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return false;
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}
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uintptr_t baseAddress = (uintptr_t)base;
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#ifdef MASKED_PSP_MEMORY
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const uintptr_t addressSpaceSize = 0x40000000ULL;
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#else
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const uintptr_t addressSpaceSize = 0x100000000ULL;
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#endif
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// Check whether hostAddress is within the PSP memory space, which (likely) means it was a guest executable that did the bad access.
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bool invalidHostAddress = hostAddress == (uintptr_t)0xFFFFFFFFFFFFFFFFULL;
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if (hostAddress < baseAddress || hostAddress >= baseAddress + addressSpaceSize) {
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// Host address outside - this was a different kind of crash.
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if (!invalidHostAddress) {
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inCrashHandler = false;
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return false;
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}
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}
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// OK, a guest executable did a bad access. Take care of it.
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uint32_t guestAddress = invalidHostAddress ? 0xFFFFFFFFUL : (uint32_t)(hostAddress - baseAddress);
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// TODO: Share the struct between the various analyzers, that will allow us to share most of
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// the implementations here.
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bool success = false;
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MemoryExceptionType type = MemoryExceptionType::NONE;
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std::string infoString = "";
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bool isAtDispatch = false;
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if (MIPSComp::jit) {
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std::string desc;
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if (MIPSComp::jit->DescribeCodePtr(codePtr, desc)) {
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infoString += desc + "\n";
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}
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if (MIPSComp::jit->IsAtDispatchFetch(codePtr)) {
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isAtDispatch = true;
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}
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}
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int instructionSize = 4;
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#if PPSSPP_ARCH(AMD64) || PPSSPP_ARCH(X86)
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// X86, X86-64. Variable instruction size so need to analyze the mov instruction in detail.
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instructionSize = 15;
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// To ignore the access, we need to disassemble the instruction and modify context->CTX_PC
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LSInstructionInfo info{};
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success = X86AnalyzeMOV(codePtr, info);
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if (success)
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instructionSize = info.instructionSize;
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#elif PPSSPP_ARCH(ARM64)
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uint32_t word;
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memcpy(&word, codePtr, 4);
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// To ignore the access, we need to disassemble the instruction and modify context->CTX_PC
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Arm64LSInstructionInfo info{};
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success = Arm64AnalyzeLoadStore((uint64_t)codePtr, word, &info);
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#elif PPSSPP_ARCH(ARM)
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uint32_t word;
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memcpy(&word, codePtr, 4);
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// To ignore the access, we need to disassemble the instruction and modify context->CTX_PC
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ArmLSInstructionInfo info{};
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success = ArmAnalyzeLoadStore((uint32_t)codePtr, word, &info);
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#elif PPSSPP_ARCH(RISCV64)
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// TODO: Put in a disassembler.
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struct RiscVLSInstructionInfo {
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int instructionSize;
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bool isIntegerLoadStore;
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bool isFPLoadStore;
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int size;
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bool isMemoryWrite;
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};
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uint32_t word;
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memcpy(&word, codePtr, 4);
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RiscVLSInstructionInfo info{};
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// Compressed instructions have low bits 00, 01, or 10.
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info.instructionSize = (word & 3) == 3 ? 4 : 2;
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instructionSize = info.instructionSize;
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success = true;
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switch (word & 0x7F) {
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case 3:
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info.isIntegerLoadStore = true;
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info.size = 1 << ((word >> 12) & 3);
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break;
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case 7:
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info.isFPLoadStore = true;
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info.size = 1 << ((word >> 12) & 3);
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break;
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case 35:
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info.isIntegerLoadStore = true;
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info.isMemoryWrite = true;
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info.size = 1 << ((word >> 12) & 3);
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break;
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case 39:
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info.isFPLoadStore = true;
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info.isMemoryWrite = true;
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info.size = 1 << ((word >> 12) & 3);
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break;
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default:
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// Compressed instruction.
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switch (word & 0x6003) {
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case 0x4000:
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case 0x4002:
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case 0x6000:
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case 0x6002:
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info.isIntegerLoadStore = true;
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info.size = (word & 0x2000) != 0 ? 8 : 4;
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info.isMemoryWrite = (word & 0x8000) != 0;
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break;
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case 0x2000:
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case 0x2002:
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info.isFPLoadStore = true;
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info.size = 8;
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info.isMemoryWrite = (word & 0x8000) != 0;
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break;
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default:
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// Not a read or a write.
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success = false;
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break;
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}
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break;
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}
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#endif
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std::string disassembly;
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if (DisassembleNativeAt(codePtr, instructionSize, &disassembly)) {
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infoString += disassembly + "\n";
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}
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if (isAtDispatch) {
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u32 targetAddr = currentMIPS->pc; // bad approximation
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// TODO: Do the other archs and platforms.
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#if PPSSPP_ARCH(AMD64) && PPSSPP_PLATFORM(WINDOWS)
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// We know which register the address is in, look in Asm.cpp.
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targetAddr = (uint32_t)context->Rax;
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#endif
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Core_ExecException(targetAddr, currentMIPS->pc, ExecExceptionType::JUMP);
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// Redirect execution to a crash handler that will switch to CoreState::CORE_RUNTIME_ERROR immediately.
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context->CTX_PC = (uintptr_t)MIPSComp::jit->GetCrashHandler();
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ERROR_LOG(MEMMAP, "Bad execution access detected, halting: %08x (last known pc %08x, host: %p)", targetAddr, currentMIPS->pc, (void *)hostAddress);
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inCrashHandler = false;
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return true;
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} else if (success) {
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if (info.isMemoryWrite) {
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type = MemoryExceptionType::WRITE_WORD;
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} else {
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type = MemoryExceptionType::READ_WORD;
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}
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} else {
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type = MemoryExceptionType::UNKNOWN;
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}
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g_lastMemoryExceptionType = type;
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bool handled = true;
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if (success && (g_Config.bIgnoreBadMemAccess || g_ignoredAddresses.find(codePtr) != g_ignoredAddresses.end())) {
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if (!info.isMemoryWrite) {
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// It was a read. Fill the destination register with 0.
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// TODO
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}
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// Move on to the next instruction. Note that handling bad accesses like this is pretty slow.
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context->CTX_PC += info.instructionSize;
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g_numReportedBadAccesses++;
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if (g_numReportedBadAccesses < 100) {
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ERROR_LOG(MEMMAP, "Bad memory access detected and ignored: %08x (%p)", guestAddress, (void *)hostAddress);
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}
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} else {
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// Either bIgnoreBadMemAccess is off, or we failed recovery analysis.
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// We can't ignore this memory access.
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uint32_t approximatePC = currentMIPS->pc;
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// TODO: Determine access size from the disassembled native instruction. We have some partial info already,
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// just need to clean it up.
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Core_MemoryExceptionInfo(guestAddress, 0, approximatePC, type, infoString, true);
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// There's a small chance we can resume from this type of crash.
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g_lastCrashAddress = codePtr;
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// Redirect execution to a crash handler that will switch to CoreState::CORE_RUNTIME_ERROR immediately.
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if (MIPSComp::jit)
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context->CTX_PC = (uintptr_t)MIPSComp::jit->GetCrashHandler();
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else
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handled = false;
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ERROR_LOG(MEMMAP, "Bad memory access detected! %08x (%p) Stopping emulation. Info:\n%s", guestAddress, (void *)hostAddress, infoString.c_str());
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}
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inCrashHandler = false;
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return handled;
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}
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#else
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bool HandleFault(uintptr_t hostAddress, void *ctx) {
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ERROR_LOG(MEMMAP, "Exception handling not supported");
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return false;
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}
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#endif
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} // namespace Memory
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