eden-emu/eden
14
3
Fork 4
Code Issues 3 Pull requests 4 Projects Releases 2 Packages Wiki Activity Actions

core/debugger: memory breakpoint support

Browse source
This commit is contained in:
Liam 2022-06-06 12:56:01 -04:00
parent 1d8e860c47
commit 8d2abc710c
19 changed files with 520 additions and 64 deletions
Download patch file Download diff file Expand all files Collapse all files

157
src/core/debugger/gdbstub.cpp
View file

@ -112,6 +112,23 @@ void GDBStub::Stopped(Kernel::KThread* thread) {
SendReply(arch->ThreadStatus(thread, GDB_STUB_SIGTRAP));
}
void GDBStub::Watchpoint(Kernel::KThread* thread, const Kernel::DebugWatchpoint& watch) {
const auto status{arch->ThreadStatus(thread, GDB_STUB_SIGTRAP)};
switch (watch.type) {
case Kernel::DebugWatchpointType::Read:
SendReply(fmt::format("{}rwatch:{:x};", status, watch.start_address));
break;
case Kernel::DebugWatchpointType::Write:
SendReply(fmt::format("{}watch:{:x};", status, watch.start_address));
break;
case Kernel::DebugWatchpointType::ReadOrWrite:
default:
SendReply(fmt::format("{}awatch:{:x};", status, watch.start_address));
break;
}
}
std::vector<DebuggerAction> GDBStub::ClientData(std::span<const u8> data) {
std::vector<DebuggerAction> actions;
current_command.insert(current_command.end(), data.begin(), data.end());
@ -278,44 +295,124 @@ void GDBStub::ExecuteCommand(std::string_view packet, std::vector<DebuggerAction
case 'c':
actions.push_back(DebuggerAction::Continue);
break;
case 'Z': {
const auto addr_sep{std::find(command.begin(), command.end(), ',') - command.begin() + 1};
const size_t addr{static_cast<size_t>(strtoll(command.data() + addr_sep, nullptr, 16))};
if (system.Memory().IsValidVirtualAddress(addr)) {
replaced_instructions[addr] = system.Memory().Read32(addr);
system.Memory().Write32(addr, arch->BreakpointInstruction());
system.InvalidateCpuInstructionCacheRange(addr, sizeof(u32));
SendReply(GDB_STUB_REPLY_OK);
} else {
SendReply(GDB_STUB_REPLY_ERR);
}
case 'Z':
HandleBreakpointInsert(command);
break;
}
case 'z': {
const auto addr_sep{std::find(command.begin(), command.end(), ',') - command.begin() + 1};
const size_t addr{static_cast<size_t>(strtoll(command.data() + addr_sep, nullptr, 16))};
const auto orig_insn{replaced_instructions.find(addr)};
if (system.Memory().IsValidVirtualAddress(addr) &&
orig_insn != replaced_instructions.end()) {
system.Memory().Write32(addr, orig_insn->second);
system.InvalidateCpuInstructionCacheRange(addr, sizeof(u32));
replaced_instructions.erase(addr);
SendReply(GDB_STUB_REPLY_OK);
} else {
SendReply(GDB_STUB_REPLY_ERR);
}
case 'z':
HandleBreakpointRemove(command);
break;
}
default:
SendReply(GDB_STUB_REPLY_EMPTY);
break;
}
}
enum class BreakpointType {
Software = 0,
Hardware = 1,
WriteWatch = 2,
ReadWatch = 3,
AccessWatch = 4,
};
void GDBStub::HandleBreakpointInsert(std::string_view command) {
const auto type{static_cast<BreakpointType>(strtoll(command.data(), nullptr, 16))};
const auto addr_sep{std::find(command.begin(), command.end(), ',') - command.begin() + 1};
const auto size_sep{std::find(command.begin() + addr_sep, command.end(), ',') -
command.begin() + 1};
const size_t addr{static_cast<size_t>(strtoll(command.data() + addr_sep, nullptr, 16))};
const size_t size{static_cast<size_t>(strtoll(command.data() + size_sep, nullptr, 16))};
if (!system.Memory().IsValidVirtualAddressRange(addr, size)) {
SendReply(GDB_STUB_REPLY_ERR);
return;
}
bool success{};
switch (type) {
case BreakpointType::Software:
replaced_instructions[addr] = system.Memory().Read32(addr);
system.Memory().Write32(addr, arch->BreakpointInstruction());
system.InvalidateCpuInstructionCacheRange(addr, sizeof(u32));
success = true;
break;
case BreakpointType::WriteWatch:
success = system.CurrentProcess()->InsertWatchpoint(system, addr, size,
Kernel::DebugWatchpointType::Write);
break;
case BreakpointType::ReadWatch:
success = system.CurrentProcess()->InsertWatchpoint(system, addr, size,
Kernel::DebugWatchpointType::Read);
break;
case BreakpointType::AccessWatch:
success = system.CurrentProcess()->InsertWatchpoint(
system, addr, size, Kernel::DebugWatchpointType::ReadOrWrite);
break;
case BreakpointType::Hardware:
default:
SendReply(GDB_STUB_REPLY_EMPTY);
return;
}
if (success) {
SendReply(GDB_STUB_REPLY_OK);
} else {
SendReply(GDB_STUB_REPLY_ERR);
}
}
void GDBStub::HandleBreakpointRemove(std::string_view command) {
const auto type{static_cast<BreakpointType>(strtoll(command.data(), nullptr, 16))};
const auto addr_sep{std::find(command.begin(), command.end(), ',') - command.begin() + 1};
const auto size_sep{std::find(command.begin() + addr_sep, command.end(), ',') -
command.begin() + 1};
const size_t addr{static_cast<size_t>(strtoll(command.data() + addr_sep, nullptr, 16))};
const size_t size{static_cast<size_t>(strtoll(command.data() + size_sep, nullptr, 16))};
if (!system.Memory().IsValidVirtualAddressRange(addr, size)) {
SendReply(GDB_STUB_REPLY_ERR);
return;
}
bool success{};
switch (type) {
case BreakpointType::Software: {
const auto orig_insn{replaced_instructions.find(addr)};
if (orig_insn != replaced_instructions.end()) {
system.Memory().Write32(addr, orig_insn->second);
system.InvalidateCpuInstructionCacheRange(addr, sizeof(u32));
replaced_instructions.erase(addr);
success = true;
}
break;
}
case BreakpointType::WriteWatch:
success = system.CurrentProcess()->RemoveWatchpoint(system, addr, size,
Kernel::DebugWatchpointType::Write);
break;
case BreakpointType::ReadWatch:
success = system.CurrentProcess()->RemoveWatchpoint(system, addr, size,
Kernel::DebugWatchpointType::Read);
break;
case BreakpointType::AccessWatch:
success = system.CurrentProcess()->RemoveWatchpoint(
system, addr, size, Kernel::DebugWatchpointType::ReadOrWrite);
break;
case BreakpointType::Hardware:
default:
SendReply(GDB_STUB_REPLY_EMPTY);
return;
}
if (success) {
SendReply(GDB_STUB_REPLY_OK);
} else {
SendReply(GDB_STUB_REPLY_ERR);
}
}
// Structure offsets are from Atmosphere
// See osdbg_thread_local_region.os.horizon.hpp and osdbg_thread_type.os.horizon.hpp