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// SPDX-FileCopyrightText: Copyright 2019 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include "common/assert.h"
#include "common/logging/log.h"
#include "core/core.h"
#include "core/core_timing.h"
#include "core/memory.h"
#include "core/tools/freezer.h"
namespace Tools {
namespace {
constexpr auto memory_freezer_ns = std::chrono::nanoseconds{1000000000 / 60};
u64 MemoryReadWidth(Core::Memory::Memory& memory, u32 width, VAddr addr) {
switch (width) {
case 1:
return memory.Read8(addr);
case 2:
return memory.Read16(addr);
case 4:
return memory.Read32(addr);
case 8:
return memory.Read64(addr);
default:
UNREACHABLE();
}
}
void MemoryWriteWidth(Core::Memory::Memory& memory, u32 width, VAddr addr, u64 value) {
switch (width) {
case 1:
memory.Write8(addr, static_cast<u8>(value));
break;
case 2:
memory.Write16(addr, static_cast<u16>(value));
break;
case 4:
memory.Write32(addr, static_cast<u32>(value));
break;
case 8:
memory.Write64(addr, value);
break;
default:
UNREACHABLE();
}
}
} // Anonymous namespace
Freezer::Freezer(Core::Timing::CoreTiming& core_timing_, Core::Memory::Memory& memory_)
: core_timing{core_timing_}, memory{memory_} {
event = Core::Timing::CreateEvent(
"MemoryFreezer::FrameCallback",
[this](std::uintptr_t user_data, s64 time,
std::chrono::nanoseconds ns_late) -> std::optional<std::chrono::nanoseconds> {
FrameCallback(user_data, ns_late);
return std::nullopt;
});
core_timing.ScheduleEvent(memory_freezer_ns, event);
}
Freezer::~Freezer() {
core_timing.UnscheduleEvent(event, 0);
}
void Freezer::SetActive(bool is_active) {
if (!active.exchange(is_active)) {
FillEntryReads();
core_timing.ScheduleEvent(memory_freezer_ns, event);
LOG_DEBUG(Common_Memory, "Memory freezer activated!");
} else {
LOG_DEBUG(Common_Memory, "Memory freezer deactivated!");
}
}
bool Freezer::IsActive() const {
return active.load(std::memory_order_relaxed);
}
void Freezer::Clear() {
std::scoped_lock lock{entries_mutex};
LOG_DEBUG(Common_Memory, "Clearing all frozen memory values.");
entries.clear();
}
u64 Freezer::Freeze(VAddr address, u32 width) {
std::scoped_lock lock{entries_mutex};
const auto current_value = MemoryReadWidth(memory, 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::scoped_lock lock{entries_mutex};
LOG_DEBUG(Common_Memory, "Unfreezing memory for address={:016X}", address);
std::erase_if(entries, [address](const Entry& entry) { return entry.address == address; });
}
bool Freezer::IsFrozen(VAddr address) const {
std::scoped_lock lock{entries_mutex};
return FindEntry(address) != entries.cend();
}
void Freezer::SetFrozenValue(VAddr address, u64 value) {
std::scoped_lock lock{entries_mutex};
const auto iter = FindEntry(address);
if (iter == entries.cend()) {
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::Entry> Freezer::GetEntry(VAddr address) const {
std::scoped_lock lock{entries_mutex};
const auto iter = FindEntry(address);
if (iter == entries.cend()) {
return std::nullopt;
}
return *iter;
}
std::vector<Freezer::Entry> Freezer::GetEntries() const {
std::scoped_lock lock{entries_mutex};
return entries;
}
Freezer::Entries::iterator Freezer::FindEntry(VAddr address) {
return std::find_if(entries.begin(), entries.end(),
[address](const Entry& entry) { return entry.address == address; });
}
Freezer::Entries::const_iterator Freezer::FindEntry(VAddr address) const {
return std::find_if(entries.begin(), entries.end(),
[address](const Entry& entry) { return entry.address == address; });
}
void Freezer::FrameCallback(std::uintptr_t, std::chrono::nanoseconds ns_late) {
if (!IsActive()) {
LOG_DEBUG(Common_Memory, "Memory freezer has been deactivated, ending callback events.");
return;
}
std::scoped_lock 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(memory, entry.width, entry.address, entry.value);
}
core_timing.ScheduleEvent(memory_freezer_ns - ns_late, event);
}
void Freezer::FillEntryReads() {
std::scoped_lock lock{entries_mutex};
LOG_DEBUG(Common_Memory, "Updating memory freeze entries to current values.");
for (auto& entry : entries) {
entry.value = MemoryReadWidth(memory, entry.width, entry.address);
}
}
} // namespace Tools
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