This revision was automatically updated to reflect the committed changes.
Closed by commit rGb1b70f676126: [lldb-server] Add setting to force
'g' packet use (authored by guiandrade, committed by labath).
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D62931/new/
https://reviews.llvm.org/D62931
Files:
lldb/packages/Python/lldbsuite/test/functionalities/gdb_remote_client/TestGDBRemoteClient.py
lldb/packages/Python/lldbsuite/test/functionalities/gdb_remote_client/gdbclientutils.py
lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.cpp
lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.h
lldb/source/Plugins/Process/gdb-remote/GDBRemoteRegisterContext.cpp
lldb/source/Plugins/Process/gdb-remote/GDBRemoteRegisterContext.h
lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemote.cpp
lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemote.h
lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemoteProperties.td
lldb/source/Plugins/Process/gdb-remote/ThreadGDBRemote.cpp
Index: lldb/source/Plugins/Process/gdb-remote/ThreadGDBRemote.cpp
===================================================================
--- lldb/source/Plugins/Process/gdb-remote/ThreadGDBRemote.cpp
+++ lldb/source/Plugins/Process/gdb-remote/ThreadGDBRemote.cpp
@@ -301,13 +301,14 @@
if (process_sp) {
ProcessGDBRemote *gdb_process =
static_cast<ProcessGDBRemote *>(process_sp.get());
- // read_all_registers_at_once will be true if 'p' packet is not
- // supported.
+ bool pSupported =
+ gdb_process->GetGDBRemote().GetpPacketSupported(GetID());
bool read_all_registers_at_once =
- !gdb_process->GetGDBRemote().GetpPacketSupported(GetID());
+ !pSupported || gdb_process->m_use_g_packet_for_reading;
+ bool write_all_registers_at_once = !pSupported;
reg_ctx_sp = std::make_shared<GDBRemoteRegisterContext>(
*this, concrete_frame_idx, gdb_process->m_register_info,
- read_all_registers_at_once);
+ read_all_registers_at_once, write_all_registers_at_once);
}
} else {
Unwind *unwinder = GetUnwinder();
Index: lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemoteProperties.td
===================================================================
--- lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemoteProperties.td
+++ lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemoteProperties.td
@@ -13,4 +13,8 @@
Global,
DefaultFalse,
Desc<"If true, the libraries-svr4 feature will be used to get a hold of the process's loaded modules.">;
+ def UseGPacketForReading: Property<"use-g-packet-for-reading", "Boolean">,
+ Global,
+ DefaultTrue,
+ Desc<"Specify if the server should use 'g' packets to read registers.">;
}
Index: lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemote.h
===================================================================
--- lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemote.h
+++ lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemote.h
@@ -284,6 +284,7 @@
lldb::CommandObjectSP m_command_sp;
int64_t m_breakpoint_pc_offset;
lldb::tid_t m_initial_tid; // The initial thread ID, given by stub on attach
+ bool m_use_g_packet_for_reading;
bool m_replay_mode;
bool m_allow_flash_writes;
Index: lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemote.cpp
===================================================================
--- lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemote.cpp
+++ lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemote.cpp
@@ -154,6 +154,11 @@
nullptr, idx,
g_processgdbremote_properties[idx].default_uint_value != 0);
}
+
+ bool GetUseGPacketForReading() const {
+ const uint32_t idx = ePropertyUseGPacketForReading;
+ return m_collection_sp->GetPropertyAtIndexAsBoolean(nullptr, idx, true);
+ }
};
typedef std::shared_ptr<PluginProperties> ProcessKDPPropertiesSP;
@@ -309,6 +314,9 @@
GetGlobalPluginProperties()->GetPacketTimeout();
if (timeout_seconds > 0)
m_gdb_comm.SetPacketTimeout(std::chrono::seconds(timeout_seconds));
+
+ m_use_g_packet_for_reading =
+ GetGlobalPluginProperties()->GetUseGPacketForReading();
}
// Destructor
Index: lldb/source/Plugins/Process/gdb-remote/GDBRemoteRegisterContext.h
===================================================================
--- lldb/source/Plugins/Process/gdb-remote/GDBRemoteRegisterContext.h
+++ lldb/source/Plugins/Process/gdb-remote/GDBRemoteRegisterContext.h
@@ -41,7 +41,7 @@
public:
GDBRemoteRegisterContext(ThreadGDBRemote &thread, uint32_t concrete_frame_idx,
GDBRemoteDynamicRegisterInfo ®_info,
- bool read_all_at_once);
+ bool read_all_at_once, bool write_all_at_once);
~GDBRemoteRegisterContext() override;
@@ -114,6 +114,7 @@
std::vector<bool> m_reg_valid;
DataExtractor m_reg_data;
bool m_read_all_at_once;
+ bool m_write_all_at_once;
private:
// Helper function for ReadRegisterBytes().
Index: lldb/source/Plugins/Process/gdb-remote/GDBRemoteRegisterContext.cpp
===================================================================
--- lldb/source/Plugins/Process/gdb-remote/GDBRemoteRegisterContext.cpp
+++ lldb/source/Plugins/Process/gdb-remote/GDBRemoteRegisterContext.cpp
@@ -31,9 +31,11 @@
// GDBRemoteRegisterContext constructor
GDBRemoteRegisterContext::GDBRemoteRegisterContext(
ThreadGDBRemote &thread, uint32_t concrete_frame_idx,
- GDBRemoteDynamicRegisterInfo ®_info, bool read_all_at_once)
+ GDBRemoteDynamicRegisterInfo ®_info, bool read_all_at_once,
+ bool write_all_at_once)
: RegisterContext(thread, concrete_frame_idx), m_reg_info(reg_info),
- m_reg_valid(), m_reg_data(), m_read_all_at_once(read_all_at_once) {
+ m_reg_valid(), m_reg_data(), m_read_all_at_once(read_all_at_once),
+ m_write_all_at_once(write_all_at_once) {
// Resize our vector of bools to contain one bool for every register. We will
// use these boolean values to know when a register value is valid in
// m_reg_data.
@@ -333,7 +335,7 @@
{
GDBRemoteClientBase::Lock lock(gdb_comm, false);
if (lock) {
- if (m_read_all_at_once) {
+ if (m_write_all_at_once) {
// Invalidate all register values
InvalidateIfNeeded(true);
Index: lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.h
===================================================================
--- lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.h
+++ lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.h
@@ -596,6 +596,8 @@
Status GetQXferMemoryMapRegionInfo(lldb::addr_t addr,
MemoryRegionInfo ®ion);
+ LazyBool GetThreadPacketSupported(lldb::tid_t tid, llvm::StringRef packetStr);
+
private:
DISALLOW_COPY_AND_ASSIGN(GDBRemoteCommunicationClient);
};
Index: lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.cpp
===================================================================
--- lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.cpp
+++ lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.cpp
@@ -543,21 +543,24 @@
//
// Takes a valid thread ID because p needs to apply to a thread.
bool GDBRemoteCommunicationClient::GetpPacketSupported(lldb::tid_t tid) {
- if (m_supports_p == eLazyBoolCalculate) {
- m_supports_p = eLazyBoolNo;
- StreamString payload;
- payload.PutCString("p0");
- StringExtractorGDBRemote response;
- if (SendThreadSpecificPacketAndWaitForResponse(tid, std::move(payload),
- response, false) ==
- PacketResult::Success &&
- response.IsNormalResponse()) {
- m_supports_p = eLazyBoolYes;
- }
- }
+ if (m_supports_p == eLazyBoolCalculate)
+ m_supports_p = GetThreadPacketSupported(tid, "p0");
return m_supports_p;
}
+LazyBool GDBRemoteCommunicationClient::GetThreadPacketSupported(
+ lldb::tid_t tid, llvm::StringRef packetStr) {
+ StreamString payload;
+ payload.PutCString(packetStr);
+ StringExtractorGDBRemote response;
+ if (SendThreadSpecificPacketAndWaitForResponse(
+ tid, std::move(payload), response, false) == PacketResult::Success &&
+ response.IsNormalResponse()) {
+ return eLazyBoolYes;
+ }
+ return eLazyBoolNo;
+}
+
StructuredData::ObjectSP GDBRemoteCommunicationClient::GetThreadsInfo() {
// Get information on all threads at one using the "jThreadsInfo" packet
StructuredData::ObjectSP object_sp;
Index: lldb/packages/Python/lldbsuite/test/functionalities/gdb_remote_client/gdbclientutils.py
===================================================================
--- lldb/packages/Python/lldbsuite/test/functionalities/gdb_remote_client/gdbclientutils.py
+++ lldb/packages/Python/lldbsuite/test/functionalities/gdb_remote_client/gdbclientutils.py
@@ -115,7 +115,7 @@
return self.readRegister(int(regnum, 16))
if packet[0] == "P":
register, value = packet[1:].split("=")
- return self.readRegister(int(register, 16), value)
+ return self.writeRegister(int(register, 16), value)
if packet[0] == "m":
addr, length = [int(x, 16) for x in packet[1:].split(',')]
return self.readMemory(addr, length)
Index: lldb/packages/Python/lldbsuite/test/functionalities/gdb_remote_client/TestGDBRemoteClient.py
===================================================================
--- lldb/packages/Python/lldbsuite/test/functionalities/gdb_remote_client/TestGDBRemoteClient.py
+++ lldb/packages/Python/lldbsuite/test/functionalities/gdb_remote_client/TestGDBRemoteClient.py
@@ -7,6 +7,18 @@
class TestGDBRemoteClient(GDBRemoteTestBase):
+ class gPacketResponder(MockGDBServerResponder):
+ def readRegisters(self):
+ return '0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000'
+
+ def setUp(self):
+ super(TestGDBRemoteClient, self).setUp()
+ self._initial_platform = lldb.DBG.GetSelectedPlatform()
+
+ def tearDown(self):
+ lldb.DBG.SetSelectedPlatform(self._initial_platform)
+ super(TestGDBRemoteClient, self).tearDown()
+
def test_connect(self):
"""Test connecting to a remote gdb server"""
target = self.createTarget("a.yaml")
@@ -37,3 +49,75 @@
error = lldb.SBError()
target.AttachToProcessWithID(lldb.SBListener(), 47, error)
self.assertEquals(error_msg, error.GetCString())
+
+ def test_read_registers_using_g_packets(self):
+ """Test reading registers using 'g' packets (default behavior)"""
+ self.server.responder = self.gPacketResponder()
+ target = self.createTarget("a.yaml")
+ process = self.connect(target)
+
+ self.assertEquals(1, self.server.responder.packetLog.count("g"))
+ self.server.responder.packetLog = []
+ self.read_registers(process)
+ # Reading registers should not cause any 'p' packets to be exchanged.
+ self.assertEquals(
+ 0, len([p for p in self.server.responder.packetLog if p.startswith("p")]))
+
+ def test_read_registers_using_p_packets(self):
+ """Test reading registers using 'p' packets"""
+ self.dbg.HandleCommand(
+ "settings set plugin.process.gdb-remote.use-g-packet-for-reading false")
+ target = self.createTarget("a.yaml")
+ process = self.connect(target)
+
+ self.read_registers(process)
+ self.assertFalse("g" in self.server.responder.packetLog)
+ self.assertGreater(
+ len([p for p in self.server.responder.packetLog if p.startswith("p")]), 0)
+
+ def test_write_registers_using_P_packets(self):
+ """Test writing registers using 'P' packets (default behavior)"""
+ self.server.responder = self.gPacketResponder()
+ target = self.createTarget("a.yaml")
+ process = self.connect(target)
+
+ self.write_registers(process)
+ self.assertEquals(0, len(
+ [p for p in self.server.responder.packetLog if p.startswith("G")]))
+ self.assertGreater(
+ len([p for p in self.server.responder.packetLog if p.startswith("P")]), 0)
+
+ def test_write_registers_using_G_packets(self):
+ """Test writing registers using 'G' packets"""
+
+ class MyResponder(self.gPacketResponder):
+ def readRegister(self, register):
+ # empty string means unsupported
+ return ""
+
+ self.server.responder = MyResponder()
+ target = self.createTarget("a.yaml")
+ process = self.connect(target)
+
+ self.write_registers(process)
+ self.assertEquals(0, len(
+ [p for p in self.server.responder.packetLog if p.startswith("P")]))
+ self.assertGreater(len(
+ [p for p in self.server.responder.packetLog if p.startswith("G")]), 0)
+
+ def read_registers(self, process):
+ self.for_each_gpr(
+ process, lambda r: self.assertEquals("0x00000000", r.GetValue()))
+
+ def write_registers(self, process):
+ self.for_each_gpr(
+ process, lambda r: r.SetValueFromCString("0x00000000"))
+
+ def for_each_gpr(self, process, operation):
+ registers = process.GetThreadAtIndex(0).GetFrameAtIndex(0).GetRegisters()
+ self.assertGreater(registers.GetSize(), 0)
+ regSet = registers[0]
+ numChildren = regSet.GetNumChildren()
+ self.assertGreater(numChildren, 0)
+ for i in range(numChildren):
+ operation(regSet.GetChildAtIndex(i))
_______________________________________________
lldb-commits mailing list
lldb-commits@lists.llvm.org
https://lists.llvm.org/cgi-bin/mailman/listinfo/lldb-commits
