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Move GetAuxvData from Host to relevant process plugins 

Summary:
GetAuxvData was causing dependencies from host to target and linux
process modules. It also does not fit netbsd use case, as there we can
only read the auxiliary vector with ptrace, which is better done in the
process plugin, with the other ptrace calls.

I resolve these issues by moving the freebsd and linux versions into the
relevant process plugins. In case of linux, this required adding an
interface in NativeProcessProtocol. The empty definitions on other
platforms can simply be removed.

To get the code compiling I had to add ProcessGdbRemote -> ProcessLinux
dependency, which was not caught before because we depended on it
transitively.

Reviewers: zturner, emaste

Subscribers: srhines, mgorny, lldb-commits

Differential Revision: https://reviews.llvm.org/D31031

llvm-svn: 298066
This commit is contained in:
Pavel Labath 2017-03-17 11:08:40 +00:00
parent dfc020e9f9
commit b7f0f45ffe
13 changed files with 56 additions and 96 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
lldb/include/lldb/Host/Host.h
View File

@ -238,10 +238,6 @@ public:
uint32_t timeout_sec,
bool run_in_default_shell = true);
static lldb::DataBufferSP GetAuxvData(lldb_private::Process *process);
static lldb::DataBufferSP GetAuxvData(lldb::pid_t pid);
static bool OpenFileInExternalEditor(const FileSpec &file_spec,
uint32_t line_no);

8
lldb/include/lldb/Host/common/NativeProcessProtocol.h
View File

@ -10,9 +10,6 @@
#ifndef liblldb_NativeProcessProtocol_h_
#define liblldb_NativeProcessProtocol_h_
#include <mutex>
#include <vector>
#include "lldb/Host/MainLoop.h"
#include "lldb/Utility/Error.h"
#include "lldb/lldb-private-forward.h"
@ -20,6 +17,8 @@
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/DenseSet.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/MemoryBuffer.h"
#include <vector>
#include "NativeBreakpointList.h"
#include "NativeWatchpointList.h"
@ -152,6 +151,9 @@ public:
bool GetByteOrder(lldb::ByteOrder &byte_order) const;
virtual llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>>
GetAuxvData() const = 0;
//----------------------------------------------------------------------
// Exit Status
//----------------------------------------------------------------------

1
lldb/source/Host/CMakeLists.txt
View File

@ -122,7 +122,6 @@ else()
linux/LibcGlue.cpp
linux/Support.cpp
)
list(APPEND LLDB_PLUGINS lldbPluginProcessLinux)
if (CMAKE_SYSTEM_NAME MATCHES "Android")
add_host_subdirectory(android
android/HostInfoAndroid.cpp

17
lldb/source/Host/freebsd/Host.cpp
View File

@ -243,23 +243,6 @@ bool Host::GetProcessInfo(lldb::pid_t pid, ProcessInstanceInfo &process_info) {
return false;
}
lldb::DataBufferSP Host::GetAuxvData(lldb_private::Process *process) {
int mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_AUXV, 0};
size_t auxv_size = AT_COUNT * sizeof(Elf_Auxinfo);
DataBufferSP buf_sp;
std::unique_ptr<DataBufferHeap> buf_ap(new DataBufferHeap(auxv_size, 0));
mib[3] = process->GetID();
if (::sysctl(mib, 4, buf_ap->GetBytes(), &auxv_size, NULL, 0) == 0) {
buf_sp.reset(buf_ap.release());
} else {
perror("sysctl failed on auxv");
}
return buf_sp;
}
Error Host::ShellExpandArguments(ProcessLaunchInfo &launch_info) {
return Error("unimplemented");
}

10
lldb/source/Host/linux/Host.cpp
View File

@ -31,7 +31,6 @@
#include "lldb/Utility/DataBufferHeap.h"
#include "lldb/Utility/DataExtractor.h"
#include "Plugins/Process/Linux/ProcFileReader.h"
#include "lldb/Core/ModuleSpec.h"
#include "lldb/Symbol/ObjectFile.h"
@ -115,15 +114,6 @@ static bool GetStatusInfo(::pid_t Pid, ProcessInstanceInfo &ProcessInfo,
return true;
}
lldb::DataBufferSP Host::GetAuxvData(lldb_private::Process *process) {
return process_linux::ProcFileReader::ReadIntoDataBuffer(process->GetID(),
"auxv");
}
lldb::DataBufferSP Host::GetAuxvData(lldb::pid_t pid) {
return process_linux::ProcFileReader::ReadIntoDataBuffer(pid, "auxv");
}
static bool IsDirNumeric(const char *dname) {
for (; *dname; dname++) {
if (!isdigit(*dname))

4
lldb/source/Host/macosx/Host.mm
View File

@ -1448,7 +1448,3 @@ void Host::SystemLog(SystemLogType type, const char *format, va_list args) {
::asl_vlog(NULL, g_aslmsg, asl_level, format, args);
}
}
lldb::DataBufferSP Host::GetAuxvData(lldb_private::Process *process) {
return lldb::DataBufferSP();
}

4
lldb/source/Host/netbsd/Host.cpp
View File

@ -259,10 +259,6 @@ bool Host::GetProcessInfo(lldb::pid_t pid, ProcessInstanceInfo &process_info) {
return false;
}
lldb::DataBufferSP Host::GetAuxvData(lldb_private::Process *process) {
return lldb::DataBufferSP();
}
Error Host::ShellExpandArguments(ProcessLaunchInfo &launch_info) {
return Error("unimplemented");
}

4
lldb/source/Host/windows/Host.cpp
View File

@ -97,10 +97,6 @@ void GetProcessExecutableAndTriple(const AutoHandle &handle,
}
}
lldb::DataBufferSP Host::GetAuxvData(lldb_private::Process *process) {
return 0;
}
lldb::thread_t Host::GetCurrentThread() {
return lldb::thread_t(::GetCurrentThread());
}

25
lldb/source/Plugins/Process/FreeBSD/ProcessFreeBSD.cpp
View File

@ -10,6 +10,12 @@
// C Includes
#include <errno.h>
#include <pthread.h>
#include <pthread_np.h>
#include <stdlib.h>
#include <sys/sysctl.h>
#include <sys/types.h>
#include <sys/user.h>
// C++ Includes
#include <mutex>
@ -904,15 +910,18 @@ bool ProcessFreeBSD::IsAThreadRunning() {
const DataBufferSP ProcessFreeBSD::GetAuxvData() {
// If we're the local platform, we can ask the host for auxv data.
PlatformSP platform_sp = GetTarget().GetPlatform();
if (platform_sp && platform_sp->IsHost())
return lldb_private::Host::GetAuxvData(this);
assert(platform_sp && platform_sp->IsHost());
// Somewhat unexpected - the process is not running locally or we don't have a
// platform.
assert(
false &&
"no platform or not the host - how did we get here with ProcessFreeBSD?");
return DataBufferSP();
int mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_AUXV, process->GetID()};
size_t auxv_size = AT_COUNT * sizeof(Elf_Auxinfo);
DataBufferSP buf_sp(new DataBufferHeap(auxv_size, 0));
if (::sysctl(mib, 4, buf_ap->GetBytes(), &auxv_size, NULL, 0) != 0) {
perror("sysctl failed on auxv");
buf_sp.reset();
}
return buf_sp;
}
struct EmulatorBaton {

6
lldb/source/Plugins/Process/Linux/NativeProcessLinux.h
View File

@ -18,6 +18,7 @@
#include "lldb/Host/Debug.h"
#include "lldb/Host/FileSpec.h"
#include "lldb/Host/HostThread.h"
#include "lldb/Host/linux/Support.h"
#include "lldb/Target/MemoryRegionInfo.h"
#include "lldb/lldb-types.h"
@ -98,6 +99,11 @@ public:
NativeThreadLinuxSP GetThreadByID(lldb::tid_t id);
llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>>
GetAuxvData() const override {
return getProcFile(GetID(), "auxv");
}
// ---------------------------------------------------------------------
// Interface used by NativeRegisterContext-derived classes.
// ---------------------------------------------------------------------

12
lldb/source/Plugins/Process/gdb-remote/CMakeLists.txt
View File

@ -2,6 +2,15 @@ if (CMAKE_SYSTEM_NAME MATCHES "Darwin")
include_directories(${LIBXML2_INCLUDE_DIR})
endif()
set(LLDB_PLUGINS
lldbPluginProcessUtility
lldbPluginPlatformMacOSX
)
if(CMAKE_SYSTEM_NAME MATCHES "Linux|Android")
list(APPEND LLDB_PLUGINS lldbPluginProcessLinux)
endif()
add_lldb_library(lldbPluginProcessGDBRemote PLUGIN
GDBRemoteClientBase.cpp
GDBRemoteCommunication.cpp
@ -24,8 +33,7 @@ add_lldb_library(lldbPluginProcessGDBRemote PLUGIN
lldbSymbol
lldbTarget
lldbUtility
lldbPluginProcessUtility
lldbPluginPlatformMacOSX
${LLDB_PLUGINS}
LINK_COMPONENTS
Support
)

55
lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.cpp
View File

@ -81,7 +81,6 @@ GDBRemoteCommunicationServerLLGS::GDBRemoteCommunicationServerLLGS(
m_continue_tid(LLDB_INVALID_THREAD_ID), m_debugged_process_mutex(),
m_debugged_process_sp(), m_stdio_communication("process.stdio"),
m_inferior_prev_state(StateType::eStateInvalid),
m_active_auxv_buffer_sp(), m_saved_registers_mutex(),
m_saved_registers_map(), m_next_saved_registers_id(1),
m_handshake_completed(false) {
RegisterPacketHandlers();
@ -2694,7 +2693,7 @@ GDBRemoteCommunicationServerLLGS::Handle_qXfer_auxv_read(
"qXfer:auxv:read:: packet missing length");
// Grab the auxv data if we need it.
if (!m_active_auxv_buffer_sp) {
if (!m_active_auxv_buffer_up) {
// Make sure we have a valid process.
if (!m_debugged_process_sp ||
(m_debugged_process_sp->GetID() == LLDB_INVALID_PROCESS_ID)) {
@ -2706,55 +2705,45 @@ GDBRemoteCommunicationServerLLGS::Handle_qXfer_auxv_read(
}
// Grab the auxv data.
m_active_auxv_buffer_sp = Host::GetAuxvData(m_debugged_process_sp->GetID());
if (!m_active_auxv_buffer_sp ||
m_active_auxv_buffer_sp->GetByteSize() == 0) {
// Hmm, no auxv data, call that an error.
if (log)
log->Printf("GDBRemoteCommunicationServerLLGS::%s failed, no auxv data "
"retrieved",
__FUNCTION__);
m_active_auxv_buffer_sp.reset();
return SendErrorResponse(0x11);
auto buffer_or_error = m_debugged_process_sp->GetAuxvData();
if (!buffer_or_error) {
std::error_code ec = buffer_or_error.getError();
LLDB_LOG(log, "no auxv data retrieved: {0}", ec.message());
return SendErrorResponse(ec.value());
}
m_active_auxv_buffer_up = std::move(*buffer_or_error);
}
// FIXME find out if/how I lock the stream here.
StreamGDBRemote response;
bool done_with_buffer = false;
if (auxv_offset >= m_active_auxv_buffer_sp->GetByteSize()) {
llvm::StringRef buffer = m_active_auxv_buffer_up->getBuffer();
if (auxv_offset >= buffer.size()) {
// We have nothing left to send. Mark the buffer as complete.
response.PutChar('l');
done_with_buffer = true;
} else {
// Figure out how many bytes are available starting at the given offset.
const uint64_t bytes_remaining =
m_active_auxv_buffer_sp->GetByteSize() - auxv_offset;
// Figure out how many bytes we're going to read.
const uint64_t bytes_to_read =
(auxv_length > bytes_remaining) ? bytes_remaining : auxv_length;
buffer = buffer.drop_front(auxv_offset);
// Mark the response type according to whether we're reading the remainder
// of the auxv data.
if (bytes_to_read >= bytes_remaining) {
if (auxv_length >= buffer.size()) {
// There will be nothing left to read after this
response.PutChar('l');
done_with_buffer = true;
} else {
// There will still be bytes to read after this request.
response.PutChar('m');
buffer = buffer.take_front(auxv_length);
}
// Now write the data in encoded binary form.
response.PutEscapedBytes(m_active_auxv_buffer_sp->GetBytes() + auxv_offset,
bytes_to_read);
response.PutEscapedBytes(buffer.data(), buffer.size());
}
if (done_with_buffer)
m_active_auxv_buffer_sp.reset();
m_active_auxv_buffer_up.reset();
return SendPacketNoLock(response.GetString());
#else
@ -3216,20 +3205,10 @@ uint32_t GDBRemoteCommunicationServerLLGS::GetNextSavedRegistersID() {
}
void GDBRemoteCommunicationServerLLGS::ClearProcessSpecificData() {
Log *log(GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PROCESS | GDBR_LOG_PROCESS));
if (log)
log->Printf("GDBRemoteCommunicationServerLLGS::%s()", __FUNCTION__);
Log *log(GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PROCESS));
// Clear any auxv cached data.
// *BSD impls should be able to do this too.
#if defined(__linux__)
if (log)
log->Printf("GDBRemoteCommunicationServerLLGS::%s clearing auxv buffer "
"(previously %s)",
__FUNCTION__,
m_active_auxv_buffer_sp ? "was set" : "was not set");
m_active_auxv_buffer_sp.reset();
#endif
LLDB_LOG(log, "clearing auxv buffer: {0}", m_active_auxv_buffer_up.get());
m_active_auxv_buffer_up.reset();
}
FileSpec

2
lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.h
View File

@ -117,7 +117,7 @@ protected:
MainLoop::ReadHandleUP m_stdio_handle_up;
lldb::StateType m_inferior_prev_state;
lldb::DataBufferSP m_active_auxv_buffer_sp;
std::unique_ptr<llvm::MemoryBuffer> m_active_auxv_buffer_up;
std::mutex m_saved_registers_mutex;
std::unordered_map<uint32_t, lldb::DataBufferSP> m_saved_registers_map;
uint32_t m_next_saved_registers_id;