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DolphinQt: Properly lock CPU before accessing emulated memory

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This fixes a problem I was having where using frame advance with the
debugger open would frequently cause panic alerts about invalid addresses
due to the CPU thread changing MSR.DR while the host thread was trying
to access memory.

To aid in tracking down all the places where we weren't properly locking
the CPU, I've created a new type (in Core.h) that you have to pass as a
reference or pointer to functions that require running as the CPU thread.
This commit is contained in:
JosJuice
2023-02-12 11:07:11 +01:00
parent efed037c4a
commit 7cecb28bdf
79 changed files with 1796 additions and 1184 deletions
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90
Source/Core/DolphinQt/Debugger/MemoryViewWidget.cpp
View File

@ -18,6 +18,7 @@
#include <fmt/printf.h>
#include "Common/Align.h"
#include "Common/Assert.h"
#include "Common/FloatUtils.h"
#include "Common/StringUtil.h"
#include "Common/Swap.h"
@ -46,6 +47,8 @@ constexpr int SCROLLBAR_PAGESTEP = 250;
constexpr int SCROLLBAR_MAXIMUM = 20000;
constexpr int SCROLLBAR_CENTER = SCROLLBAR_MAXIMUM / 2;
const QString INVALID_MEMORY = QStringLiteral("-");
class MemoryViewTable final : public QTableWidget
{
public:
@ -151,11 +154,13 @@ public:
u32 end_address = address + static_cast<u32>(bytes.size()) - 1;
AddressSpace::Accessors* accessors = AddressSpace::GetAccessors(m_view->GetAddressSpace());
if (!bytes.empty() && accessors->IsValidAddress(address) &&
accessors->IsValidAddress(end_address))
Core::CPUThreadGuard guard;
if (!bytes.empty() && accessors->IsValidAddress(guard, address) &&
accessors->IsValidAddress(guard, end_address))
{
for (const u8 c : bytes)
accessors->WriteU8(address++, c);
accessors->WriteU8(guard, address++, c);
}
m_view->Update();
@ -190,8 +195,9 @@ MemoryViewWidget::MemoryViewWidget(QWidget* parent) : QWidget(parent)
connect(&Settings::Instance(), &Settings::DebugFontChanged, this, &MemoryViewWidget::UpdateFont);
connect(&Settings::Instance(), &Settings::EmulationStateChanged, this,
&MemoryViewWidget::UpdateColumns);
connect(Host::GetInstance(), &Host::UpdateDisasmDialog, this, &MemoryViewWidget::UpdateColumns);
qOverload<>(&MemoryViewWidget::UpdateColumns));
connect(Host::GetInstance(), &Host::UpdateDisasmDialog, this,
qOverload<>(&MemoryViewWidget::UpdateColumns));
connect(&Settings::Instance(), &Settings::ThemeChanged, this, &MemoryViewWidget::Update);
// Also calls create table.
@ -322,13 +328,13 @@ void MemoryViewWidget::CreateTable()
bp_item->setData(USER_ROLE_VALUE_TYPE, static_cast<int>(Type::Null));
// Row Addresses
auto* row_item = new QTableWidgetItem(QStringLiteral("-"));
auto* row_item = new QTableWidgetItem(INVALID_MEMORY);
row_item->setFlags(Qt::ItemIsEnabled | Qt::ItemIsSelectable);
row_item->setData(USER_ROLE_IS_ROW_BREAKPOINT_CELL, false);
row_item->setData(USER_ROLE_VALUE_TYPE, static_cast<int>(Type::Null));
// Data item
auto* item = new QTableWidgetItem(QStringLiteral("-"));
auto* item = new QTableWidgetItem(INVALID_MEMORY);
item->setFlags(Qt::ItemIsEnabled | Qt::ItemIsSelectable | Qt::ItemIsEditable);
item->setData(USER_ROLE_IS_ROW_BREAKPOINT_CELL, false);
@ -430,6 +436,24 @@ void MemoryViewWidget::Update()
}
void MemoryViewWidget::UpdateColumns()
{
// Check if table is created
if (m_table->item(1, 1) == nullptr)
return;
if (Core::GetState() == Core::State::Paused)
{
Core::CPUThreadGuard guard;
UpdateColumns(&guard);
}
else
{
// If the core is running, blank out the view of memory instead of reading anything.
UpdateColumns(nullptr);
}
}
void MemoryViewWidget::UpdateColumns(const Core::CPUThreadGuard* guard)
{
// Check if table is created
if (m_table->item(1, 1) == nullptr)
@ -445,7 +469,7 @@ void MemoryViewWidget::UpdateColumns()
const u32 cell_address = cell_item->data(USER_ROLE_CELL_ADDRESS).toUInt();
const Type type = static_cast<Type>(cell_item->data(USER_ROLE_VALUE_TYPE).toInt());
cell_item->setText(ValueToString(cell_address, type));
cell_item->setText(guard ? ValueToString(*guard, cell_address, type) : INVALID_MEMORY);
// Set search address to selected / colored
if (cell_address == m_address_highlight)
@ -454,55 +478,56 @@ void MemoryViewWidget::UpdateColumns()
}
}
QString MemoryViewWidget::ValueToString(u32 address, Type type)
// May only be called if we have taken on the role of the CPU thread
QString MemoryViewWidget::ValueToString(const Core::CPUThreadGuard& guard, u32 address, Type type)
{
const AddressSpace::Accessors* accessors = AddressSpace::GetAccessors(m_address_space);
if (!accessors->IsValidAddress(address) || Core::GetState() != Core::State::Paused)
return QStringLiteral("-");
if (!accessors->IsValidAddress(guard, address))
return INVALID_MEMORY;
switch (type)
{
case Type::Hex8:
{
const u8 value = accessors->ReadU8(address);
const u8 value = accessors->ReadU8(guard, address);
return QStringLiteral("%1").arg(value, 2, 16, QLatin1Char('0'));
}
case Type::ASCII:
{
const char value = accessors->ReadU8(address);
const char value = accessors->ReadU8(guard, address);
return IsPrintableCharacter(value) ? QString{QChar::fromLatin1(value)} :
QString{QChar::fromLatin1('.')};
}
case Type::Hex16:
{
const u16 value = accessors->ReadU16(address);
const u16 value = accessors->ReadU16(guard, address);
return QStringLiteral("%1").arg(value, 4, 16, QLatin1Char('0'));
}
case Type::Hex32:
{
const u32 value = accessors->ReadU32(address);
const u32 value = accessors->ReadU32(guard, address);
return QStringLiteral("%1").arg(value, 8, 16, QLatin1Char('0'));
}
case Type::Hex64:
{
const u64 value = accessors->ReadU64(address);
const u64 value = accessors->ReadU64(guard, address);
return QStringLiteral("%1").arg(value, 16, 16, QLatin1Char('0'));
}
case Type::Unsigned8:
return QString::number(accessors->ReadU8(address));
return QString::number(accessors->ReadU8(guard, address));
case Type::Unsigned16:
return QString::number(accessors->ReadU16(address));
return QString::number(accessors->ReadU16(guard, address));
case Type::Unsigned32:
return QString::number(accessors->ReadU32(address));
return QString::number(accessors->ReadU32(guard, address));
case Type::Signed8:
return QString::number(Common::BitCast<s8>(accessors->ReadU8(address)));
return QString::number(Common::BitCast<s8>(accessors->ReadU8(guard, address)));
case Type::Signed16:
return QString::number(Common::BitCast<s16>(accessors->ReadU16(address)));
return QString::number(Common::BitCast<s16>(accessors->ReadU16(guard, address)));
case Type::Signed32:
return QString::number(Common::BitCast<s32>(accessors->ReadU32(address)));
return QString::number(Common::BitCast<s32>(accessors->ReadU32(guard, address)));
case Type::Float32:
{
QString string = QString::number(accessors->ReadF32(address), 'g', 4);
QString string = QString::number(accessors->ReadF32(guard, address), 'g', 4);
// Align to first digit.
if (!string.startsWith(QLatin1Char('-')))
string.prepend(QLatin1Char(' '));
@ -511,7 +536,8 @@ QString MemoryViewWidget::ValueToString(u32 address, Type type)
}
case Type::Double:
{
QString string = QString::number(Common::BitCast<double>(accessors->ReadU64(address)), 'g', 4);
QString string =
QString::number(Common::BitCast<double>(accessors->ReadU64(guard, address)), 'g', 4);
// Align to first digit.
if (!string.startsWith(QLatin1Char('-')))
string.prepend(QLatin1Char(' '));
@ -519,7 +545,7 @@ QString MemoryViewWidget::ValueToString(u32 address, Type type)
return string;
}
default:
return QStringLiteral("-");
return INVALID_MEMORY;
}
}
@ -823,7 +849,11 @@ void MemoryViewWidget::OnCopyHex(u32 addr)
const auto length = GetTypeSize(m_type);
const AddressSpace::Accessors* accessors = AddressSpace::GetAccessors(m_address_space);
u64 value = accessors->ReadU64(addr);
const u64 value = [addr, accessors] {
Core::CPUThreadGuard guard;
return accessors->ReadU64(guard, addr);
}();
QApplication::clipboard()->setText(
QStringLiteral("%1").arg(value, sizeof(u64) * 2, 16, QLatin1Char('0')).left(length * 2));
@ -839,10 +869,14 @@ void MemoryViewWidget::OnContextMenu(const QPoint& pos)
return;
const u32 addr = item_selected->data(USER_ROLE_CELL_ADDRESS).toUInt();
const AddressSpace::Accessors* accessors = AddressSpace::GetAccessors(m_address_space);
const bool item_has_value =
item_selected->data(USER_ROLE_VALUE_TYPE).toInt() != static_cast<int>(Type::Null) &&
accessors->IsValidAddress(addr);
[this, addr] {
const AddressSpace::Accessors* accessors = AddressSpace::GetAccessors(m_address_space);
Core::CPUThreadGuard guard;
return accessors->IsValidAddress(guard, addr);
}();
auto* menu = new QMenu(this);