From 1b7d619914c8d132dbffb8b6a5bb3a1aab686f9d Mon Sep 17 00:00:00 2001 From: Zach Hilman Date: Thu, 30 May 2019 08:52:20 -0400 Subject: [PATCH] memory: Add class to manage and enforce memory freezing --- src/core/CMakeLists.txt | 2 + src/core/core.cpp | 2 + src/core/memory/freezer.cpp | 186 ++++++++++++++++++++++++++++++++++++ src/core/memory/freezer.h | 58 +++++++++++ 4 files changed, 248 insertions(+) create mode 100644 src/core/memory/freezer.cpp create mode 100644 src/core/memory/freezer.h diff --git a/src/core/CMakeLists.txt b/src/core/CMakeLists.txt index 4204ace2b..c17528134 100644 --- a/src/core/CMakeLists.txt +++ b/src/core/CMakeLists.txt @@ -454,6 +454,8 @@ add_library(core STATIC loader/nsp.h loader/xci.cpp loader/xci.h + memory/freezer.cpp + memory/freezer.h memory.cpp memory.h memory_setup.h diff --git a/src/core/core.cpp b/src/core/core.cpp index ff0721079..94ebe0995 100644 --- a/src/core/core.cpp +++ b/src/core/core.cpp @@ -28,6 +28,7 @@ #include "core/hle/service/service.h" #include "core/hle/service/sm/sm.h" #include "core/loader/loader.h" +#include "core/memory/freezer.h" #include "core/perf_stats.h" #include "core/settings.h" #include "core/telemetry_session.h" @@ -243,6 +244,7 @@ struct System::Impl { bool is_powered_on = false; std::unique_ptr cheat_engine; + std::unique_ptr memory_freezer; /// Frontend applets Service::AM::Applets::AppletManager applet_manager; diff --git a/src/core/memory/freezer.cpp b/src/core/memory/freezer.cpp new file mode 100644 index 000000000..1d0ccf328 --- /dev/null +++ b/src/core/memory/freezer.cpp @@ -0,0 +1,186 @@ +// Copyright 2019 yuzu Emulator Project +// Licensed under GPLv2 or any later version +// Refer to the license.txt file included. + +#include "common/assert.h" +#include "core/core.h" +#include "core/core_timing_util.h" +#include "core/memory.h" +#include "core/memory/freezer.h" + +namespace Memory { + +constexpr s64 MEMORY_FREEZER_TICKS = static_cast(Core::Timing::BASE_CLOCK_RATE / 60); + +namespace { + +u64 MemoryReadWidth(u8 width, VAddr addr) { + switch (width) { + case 1: + return Read8(addr); + case 2: + return Read16(addr); + case 4: + return Read32(addr); + case 8: + return Read64(addr); + default: + UNREACHABLE(); + return 0; + } +} + +void MemoryWriteWidth(u8 width, VAddr addr, u64 value) { + switch (width) { + case 1: + Write8(addr, static_cast(value)); + break; + case 2: + Write16(addr, static_cast(value)); + break; + case 4: + Write32(addr, static_cast(value)); + break; + case 8: + Write64(addr, value); + break; + default: + UNREACHABLE(); + } +} + +} // Anonymous namespace + +Freezer::Freezer(Core::Timing::CoreTiming& core_timing) : core_timing(core_timing) { + event = core_timing.RegisterEvent( + "MemoryFreezer::FrameCallback", + [this](u64 userdata, s64 cycles_late) { FrameCallback(userdata, cycles_late); }); + core_timing.ScheduleEvent(MEMORY_FREEZER_TICKS, event); +} + +Freezer::~Freezer() { + core_timing.UnscheduleEvent(event, 0); +} + +void Freezer::SetActive(bool active) { + if (!this->active.exchange(active)) { + FillEntryReads(); + core_timing.ScheduleEvent(MEMORY_FREEZER_TICKS, event); + LOG_DEBUG(Common_Memory, "Memory freezer activated!"); + } else { + LOG_DEBUG(Common_Memory, "Memory freezer deactivated!"); + } +} + +bool Freezer::IsActive() const { + return active.load(); +} + +void Freezer::Clear() { + std::lock_guard lock(entries_mutex); + + LOG_DEBUG(Common_Memory, "Clearing all frozen memory values."); + + entries.clear(); +} + +u64 Freezer::Freeze(VAddr address, u8 width) { + std::lock_guard lock(entries_mutex); + + const auto current_value = MemoryReadWidth(width, address); + entries.push_back({address, width, current_value}); + + LOG_DEBUG(Common_Memory, + "Freezing memory for address={:016X}, width={:02X}, current_value={:016X}", address, + width, current_value); + + return current_value; +} + +void Freezer::Unfreeze(VAddr address) { + std::lock_guard lock(entries_mutex); + + LOG_DEBUG(Common_Memory, "Unfreezing memory for address={:016X}", address); + + entries.erase( + std::remove_if(entries.begin(), entries.end(), + [&address](const Entry& entry) { return entry.address == address; }), + entries.end()); +} + +bool Freezer::IsFrozen(VAddr address) { + std::lock_guard lock(entries_mutex); + + return std::find_if(entries.begin(), entries.end(), [&address](const Entry& entry) { + return entry.address == address; + }) != entries.end(); +} + +void Freezer::SetFrozenValue(VAddr address, u64 value) { + std::lock_guard lock(entries_mutex); + + const auto iter = std::find_if(entries.begin(), entries.end(), [&address](const Entry& entry) { + return entry.address == address; + }); + + if (iter == entries.end()) { + LOG_ERROR(Common_Memory, + "Tried to set freeze value for address={:016X} that is not frozen!", address); + return; + } + + LOG_DEBUG(Common_Memory, + "Manually overridden freeze value for address={:016X}, width={:02X} to value={:016X}", + iter->address, iter->width, value); + iter->value = value; +} + +std::optional Freezer::GetEntry(VAddr address) { + std::lock_guard lock(entries_mutex); + + const auto iter = std::find_if(entries.begin(), entries.end(), [&address](const Entry& entry) { + return entry.address == address; + }); + + if (iter == entries.end()) { + return std::nullopt; + } + + return *iter; +} + +std::vector Freezer::GetEntries() { + std::lock_guard lock(entries_mutex); + + return entries; +} + +void Freezer::FrameCallback(u64 userdata, s64 cycles_late) { + if (!active.load()) { + LOG_DEBUG(Common_Memory, "Memory freezer has been deactivated, ending callback events."); + return; + } + + std::lock_guard lock(entries_mutex); + + for (const auto& entry : entries) { + LOG_DEBUG(Common_Memory, + "Enforcing memory freeze at address={:016X}, value={:016X}, width={:02X}", + entry.address, entry.value, entry.width); + MemoryWriteWidth(entry.width, entry.address, entry.value); + } + + core_timing.ScheduleEvent(MEMORY_FREEZER_TICKS - cycles_late, event); +} + +void Freezer::FillEntryReads() { + std::lock_guard lock(entries_mutex); + + LOG_DEBUG(Common_Memory, "Updating memory freeze entries to current values."); + + for (auto& entry : entries) { + entry.value = MemoryReadWidth(entry.width, entry.address); + } +} + +} // namespace Memory diff --git a/src/core/memory/freezer.h b/src/core/memory/freezer.h new file mode 100644 index 000000000..3e271793e --- /dev/null +++ b/src/core/memory/freezer.h @@ -0,0 +1,58 @@ +// Copyright 2019 yuzu Emulator Project +// Licensed under GPLv2 or any later version +// Refer to the license.txt file included. + +#pragma once + +#include +#include +#include "common/common_types.h" +#include "core/core_timing.h" + +namespace Core { +class System; +} // namespace Core + +namespace Memory { + +// A class that will effectively freeze memory values. +class Freezer { +public: + struct Entry { + VAddr address; + u8 width; + u64 value; + }; + + Freezer(Core::Timing::CoreTiming& core_timing); + ~Freezer(); + + void SetActive(bool active); + bool IsActive() const; + + void Clear(); + + u64 Freeze(VAddr address, u8 width); + void Unfreeze(VAddr address); + + bool IsFrozen(VAddr address); + void SetFrozenValue(VAddr address, u64 value); + + std::optional GetEntry(VAddr address); + + std::vector GetEntries(); + +private: + void FrameCallback(u64 userdata, s64 cycles_late); + void FillEntryReads(); + + std::atomic_bool active{false}; + + std::recursive_mutex entries_mutex; + std::vector entries; + + Core::Timing::EventType* event; + Core::Timing::CoreTiming& core_timing; +}; + +} // namespace Memory