llvm-project/lldb/source/Plugins/Platform/FreeBSD/PlatformFreeBSD.cpp

//===-- PlatformFreeBSD.cpp -------------------------------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#include "PlatformFreeBSD.h"
#include "lldb/Host/Config.h"

// C Includes
#include <stdio.h>
#ifndef LLDB_DISABLE_POSIX
#include <sys/utsname.h>
#endif

// C++ Includes
// Other libraries and framework includes
// Project includes
#include "lldb/Breakpoint/BreakpointLocation.h"
#include "lldb/Breakpoint/BreakpointSite.h"
#include "lldb/Core/Debugger.h"
#include "lldb/Core/Error.h"
#include "lldb/Core/Module.h"
#include "lldb/Core/ModuleSpec.h"
#include "lldb/Core/PluginManager.h"
#include "lldb/Host/Host.h"
#include "lldb/Host/HostInfo.h"
#include "lldb/Target/Process.h"

using namespace lldb;
using namespace lldb_private;
using namespace lldb_private::platform_freebsd;

PlatformSP PlatformFreeBSD::CreateInstance(bool force, const ArchSpec *arch) {
  // The only time we create an instance is when we are creating a remote
  // freebsd platform
  const bool is_host = false;

  bool create = force;
  if (create == false && arch && arch->IsValid()) {
    const llvm::Triple &triple = arch->GetTriple();
    switch (triple.getOS()) {
    case llvm::Triple::FreeBSD:
      create = true;
      break;

#if defined(__FreeBSD__) || defined(__OpenBSD__)
    // Only accept "unknown" for the OS if the host is BSD and
    // it "unknown" wasn't specified (it was just returned because it
    // was NOT specified)
    case llvm::Triple::OSType::UnknownOS:
      create = !arch->TripleOSWasSpecified();
      break;
#endif
    default:
      break;
    }
  }
  if (create)
    return PlatformSP(new PlatformFreeBSD(is_host));
  return PlatformSP();
}

ConstString PlatformFreeBSD::GetPluginNameStatic(bool is_host) {
  if (is_host) {
    static ConstString g_host_name(Platform::GetHostPlatformName());
    return g_host_name;
  } else {
    static ConstString g_remote_name("remote-freebsd");
    return g_remote_name;
  }
}

const char *PlatformFreeBSD::GetDescriptionStatic(bool is_host) {
  if (is_host)
    return "Local FreeBSD user platform plug-in.";
  else
    return "Remote FreeBSD user platform plug-in.";
}

static uint32_t g_initialize_count = 0;

void PlatformFreeBSD::Initialize() {
  Platform::Initialize();

  if (g_initialize_count++ == 0) {
#if defined(__FreeBSD__)
    // Force a host flag to true for the default platform object.
    PlatformSP default_platform_sp(new PlatformFreeBSD(true));
    default_platform_sp->SetSystemArchitecture(HostInfo::GetArchitecture());
    Platform::SetHostPlatform(default_platform_sp);
#endif
    PluginManager::RegisterPlugin(PlatformFreeBSD::GetPluginNameStatic(false),
                                  PlatformFreeBSD::GetDescriptionStatic(false),
                                  PlatformFreeBSD::CreateInstance);
  }
}

void PlatformFreeBSD::Terminate() {
  if (g_initialize_count > 0 && --g_initialize_count == 0)
    PluginManager::UnregisterPlugin(PlatformFreeBSD::CreateInstance);

  Platform::Terminate();
}

bool PlatformFreeBSD::GetModuleSpec(const FileSpec &module_file_spec,
                                    const ArchSpec &arch,
                                    ModuleSpec &module_spec) {
  if (m_remote_platform_sp)
    return m_remote_platform_sp->GetModuleSpec(module_file_spec, arch,
                                               module_spec);

  return Platform::GetModuleSpec(module_file_spec, arch, module_spec);
}

Error PlatformFreeBSD::RunShellCommand(const char *command,
                                       const FileSpec &working_dir,
                                       int *status_ptr, int *signo_ptr,
                                       std::string *command_output,
                                       uint32_t timeout_sec) {
  if (IsHost())
    return Host::RunShellCommand(command, working_dir, status_ptr, signo_ptr,
                                 command_output, timeout_sec);
  else {
    if (m_remote_platform_sp)
      return m_remote_platform_sp->RunShellCommand(command, working_dir,
                                                   status_ptr, signo_ptr,
                                                   command_output, timeout_sec);
    else
      return Error("unable to run a remote command without a platform");
  }
}

Error PlatformFreeBSD::ResolveExecutable(
    const ModuleSpec &module_spec, lldb::ModuleSP &exe_module_sp,
    const FileSpecList *module_search_paths_ptr) {
  Error error;
  // Nothing special to do here, just use the actual file and architecture

  char exe_path[PATH_MAX];
  ModuleSpec resolved_module_spec(module_spec);

  if (IsHost()) {
    // If we have "ls" as the module_spec's file, resolve the executable
    // location based on
    // the current path variables
    if (!resolved_module_spec.GetFileSpec().Exists()) {
      module_spec.GetFileSpec().GetPath(exe_path, sizeof(exe_path));
      resolved_module_spec.GetFileSpec().SetFile(exe_path, true);
    }

    if (!resolved_module_spec.GetFileSpec().Exists())
      resolved_module_spec.GetFileSpec().ResolveExecutableLocation();

    if (resolved_module_spec.GetFileSpec().Exists())
      error.Clear();
    else {
      error.SetErrorStringWithFormat(
          "unable to find executable for '%s'",
          resolved_module_spec.GetFileSpec().GetPath().c_str());
    }
  } else {
    if (m_remote_platform_sp) {
      error =
          GetCachedExecutable(resolved_module_spec, exe_module_sp,
                              module_search_paths_ptr, *m_remote_platform_sp);
    } else {
      // We may connect to a process and use the provided executable (Don't use
      // local $PATH).

      // Resolve any executable within a bundle on MacOSX
      Host::ResolveExecutableInBundle(resolved_module_spec.GetFileSpec());

      if (resolved_module_spec.GetFileSpec().Exists()) {
        error.Clear();
      } else {
        error.SetErrorStringWithFormat(
            "the platform is not currently connected, and '%s' doesn't exist "
            "in the system root.",
            resolved_module_spec.GetFileSpec().GetPath().c_str());
      }
    }
  }

  if (error.Success()) {
    if (resolved_module_spec.GetArchitecture().IsValid()) {
      error = ModuleList::GetSharedModule(resolved_module_spec, exe_module_sp,
                                          module_search_paths_ptr, NULL, NULL);

      if (!exe_module_sp || exe_module_sp->GetObjectFile() == NULL) {
        exe_module_sp.reset();
        error.SetErrorStringWithFormat(
            "'%s' doesn't contain the architecture %s",
            resolved_module_spec.GetFileSpec().GetPath().c_str(),
            resolved_module_spec.GetArchitecture().GetArchitectureName());
      }
    } else {
      // No valid architecture was specified, ask the platform for
      // the architectures that we should be using (in the correct order)
      // and see if we can find a match that way
      StreamString arch_names;
      for (uint32_t idx = 0; GetSupportedArchitectureAtIndex(
               idx, resolved_module_spec.GetArchitecture());
           ++idx) {
        error =
            ModuleList::GetSharedModule(resolved_module_spec, exe_module_sp,
                                        module_search_paths_ptr, NULL, NULL);
        // Did we find an executable using one of the
        if (error.Success()) {
          if (exe_module_sp && exe_module_sp->GetObjectFile())
            break;
          else
            error.SetErrorToGenericError();
        }

        if (idx > 0)
          arch_names.PutCString(", ");
        arch_names.PutCString(
            resolved_module_spec.GetArchitecture().GetArchitectureName());
      }

      if (error.Fail() || !exe_module_sp) {
        if (resolved_module_spec.GetFileSpec().Readable()) {
          error.SetErrorStringWithFormat(
              "'%s' doesn't contain any '%s' platform architectures: %s",
              resolved_module_spec.GetFileSpec().GetPath().c_str(),
              GetPluginName().GetCString(), arch_names.GetString().c_str());
        } else {
          error.SetErrorStringWithFormat(
              "'%s' is not readable",
              resolved_module_spec.GetFileSpec().GetPath().c_str());
        }
      }
    }
  }

  return error;
}

// From PlatformMacOSX only
Error PlatformFreeBSD::GetFileWithUUID(const FileSpec &platform_file,
                                       const UUID *uuid_ptr,
                                       FileSpec &local_file) {
  if (IsRemote()) {
    if (m_remote_platform_sp)
      return m_remote_platform_sp->GetFileWithUUID(platform_file, uuid_ptr,
                                                   local_file);
  }

  // Default to the local case
  local_file = platform_file;
  return Error();
}

//------------------------------------------------------------------
/// Default Constructor
//------------------------------------------------------------------
PlatformFreeBSD::PlatformFreeBSD(bool is_host)
    : Platform(is_host), m_remote_platform_sp() {}

//------------------------------------------------------------------
/// Destructor.
///
/// The destructor is virtual since this class is designed to be
/// inherited from by the plug-in instance.
//------------------------------------------------------------------
PlatformFreeBSD::~PlatformFreeBSD() {}

// TODO:VK: inherit PlatformPOSIX

bool PlatformFreeBSD::GetRemoteOSVersion() {
  if (m_remote_platform_sp)
    return m_remote_platform_sp->GetOSVersion(
        m_major_os_version, m_minor_os_version, m_update_os_version);
  return false;
}

bool PlatformFreeBSD::GetRemoteOSBuildString(std::string &s) {
  if (m_remote_platform_sp)
    return m_remote_platform_sp->GetRemoteOSBuildString(s);
  s.clear();
  return false;
}

bool PlatformFreeBSD::GetRemoteOSKernelDescription(std::string &s) {
  if (m_remote_platform_sp)
    return m_remote_platform_sp->GetRemoteOSKernelDescription(s);
  s.clear();
  return false;
}

// Remote Platform subclasses need to override this function
ArchSpec PlatformFreeBSD::GetRemoteSystemArchitecture() {
  if (m_remote_platform_sp)
    return m_remote_platform_sp->GetRemoteSystemArchitecture();
  return ArchSpec();
}

const char *PlatformFreeBSD::GetHostname() {
  if (IsHost())
    return Platform::GetHostname();

  if (m_remote_platform_sp)
    return m_remote_platform_sp->GetHostname();
  return NULL;
}

bool PlatformFreeBSD::IsConnected() const {
  if (IsHost())
    return true;
  else if (m_remote_platform_sp)
    return m_remote_platform_sp->IsConnected();
  return false;
}

Error PlatformFreeBSD::ConnectRemote(Args &args) {
  Error error;
  if (IsHost()) {
    error.SetErrorStringWithFormat(
        "can't connect to the host platform '%s', always connected",
        GetPluginName().GetCString());
  } else {
    if (!m_remote_platform_sp)
      m_remote_platform_sp =
          Platform::Create(ConstString("remote-gdb-server"), error);

    if (m_remote_platform_sp) {
      if (error.Success()) {
        if (m_remote_platform_sp) {
          error = m_remote_platform_sp->ConnectRemote(args);
        } else {
          error.SetErrorString(
              "\"platform connect\" takes a single argument: <connect-url>");
        }
      }
    } else
      error.SetErrorString("failed to create a 'remote-gdb-server' platform");

    if (error.Fail())
      m_remote_platform_sp.reset();
  }

  return error;
}

Error PlatformFreeBSD::DisconnectRemote() {
  Error error;

  if (IsHost()) {
    error.SetErrorStringWithFormat(
        "can't disconnect from the host platform '%s', always connected",
        GetPluginName().GetCString());
  } else {
    if (m_remote_platform_sp)
      error = m_remote_platform_sp->DisconnectRemote();
    else
      error.SetErrorString("the platform is not currently connected");
  }
  return error;
}

bool PlatformFreeBSD::GetProcessInfo(lldb::pid_t pid,
                                     ProcessInstanceInfo &process_info) {
  bool success = false;
  if (IsHost()) {
    success = Platform::GetProcessInfo(pid, process_info);
  } else if (m_remote_platform_sp) {
    success = m_remote_platform_sp->GetProcessInfo(pid, process_info);
  }
  return success;
}

uint32_t
PlatformFreeBSD::FindProcesses(const ProcessInstanceInfoMatch &match_info,
                               ProcessInstanceInfoList &process_infos) {
  uint32_t match_count = 0;
  if (IsHost()) {
    // Let the base class figure out the host details
    match_count = Platform::FindProcesses(match_info, process_infos);
  } else {
    // If we are remote, we can only return results if we are connected
    if (m_remote_platform_sp)
      match_count =
          m_remote_platform_sp->FindProcesses(match_info, process_infos);
  }
  return match_count;
}

const char *PlatformFreeBSD::GetUserName(uint32_t uid) {
  // Check the cache in Platform in case we have already looked this uid up
  const char *user_name = Platform::GetUserName(uid);
  if (user_name)
    return user_name;

  if (IsRemote() && m_remote_platform_sp)
    return m_remote_platform_sp->GetUserName(uid);
  return NULL;
}

const char *PlatformFreeBSD::GetGroupName(uint32_t gid) {
  const char *group_name = Platform::GetGroupName(gid);
  if (group_name)
    return group_name;

  if (IsRemote() && m_remote_platform_sp)
    return m_remote_platform_sp->GetGroupName(gid);
  return NULL;
}

Error PlatformFreeBSD::GetSharedModule(
    const ModuleSpec &module_spec, Process *process, ModuleSP &module_sp,
    const FileSpecList *module_search_paths_ptr, ModuleSP *old_module_sp_ptr,
    bool *did_create_ptr) {
  Error error;
  module_sp.reset();

  if (IsRemote()) {
    // If we have a remote platform always, let it try and locate
    // the shared module first.
    if (m_remote_platform_sp) {
      error = m_remote_platform_sp->GetSharedModule(
          module_spec, process, module_sp, module_search_paths_ptr,
          old_module_sp_ptr, did_create_ptr);
    }
  }

  if (!module_sp) {
    // Fall back to the local platform and find the file locally
    error = Platform::GetSharedModule(module_spec, process, module_sp,
                                      module_search_paths_ptr,
                                      old_module_sp_ptr, did_create_ptr);
  }
  if (module_sp)
    module_sp->SetPlatformFileSpec(module_spec.GetFileSpec());
  return error;
}

bool PlatformFreeBSD::GetSupportedArchitectureAtIndex(uint32_t idx,
                                                      ArchSpec &arch) {
  if (IsHost()) {
    ArchSpec hostArch = HostInfo::GetArchitecture(HostInfo::eArchKindDefault);
    if (hostArch.GetTriple().isOSFreeBSD()) {
      if (idx == 0) {
        arch = hostArch;
        return arch.IsValid();
      } else if (idx == 1) {
        // If the default host architecture is 64-bit, look for a 32-bit variant
        if (hostArch.IsValid() && hostArch.GetTriple().isArch64Bit()) {
          arch = HostInfo::GetArchitecture(HostInfo::eArchKind32);
          return arch.IsValid();
        }
      }
    }
  } else {
    if (m_remote_platform_sp)
      return m_remote_platform_sp->GetSupportedArchitectureAtIndex(idx, arch);

    llvm::Triple triple;
    // Set the OS to FreeBSD
    triple.setOS(llvm::Triple::FreeBSD);
    // Set the architecture
    switch (idx) {
    case 0:
      triple.setArchName("x86_64");
      break;
    case 1:
      triple.setArchName("i386");
      break;
    case 2:
      triple.setArchName("aarch64");
      break;
    case 3:
      triple.setArchName("arm");
      break;
    case 4:
      triple.setArchName("mips64");
      break;
    case 5:
      triple.setArchName("mips");
      break;
    case 6:
      triple.setArchName("ppc64");
      break;
    case 7:
      triple.setArchName("ppc");
      break;
    default:
      return false;
    }
    // Leave the vendor as "llvm::Triple:UnknownVendor" and don't specify the
    // vendor by
    // calling triple.SetVendorName("unknown") so that it is a "unspecified
    // unknown".
    // This means when someone calls triple.GetVendorName() it will return an
    // empty string
    // which indicates that the vendor can be set when two architectures are
    // merged

    // Now set the triple into "arch" and return true
    arch.SetTriple(triple);
    return true;
  }
  return false;
}

void PlatformFreeBSD::GetStatus(Stream &strm) {
#ifndef LLDB_DISABLE_POSIX
  struct utsname un;

  strm << "      Host: ";

  ::memset(&un, 0, sizeof(utsname));
  if (uname(&un) == -1)
    strm << "FreeBSD" << '\n';

  strm << un.sysname << ' ' << un.release;
  if (un.nodename[0] != '\0')
    strm << " (" << un.nodename << ')';
  strm << '\n';

  // Dump a common information about the platform status.
  strm << "Host: " << un.sysname << ' ' << un.release << ' ' << un.version
       << '\n';
#endif

  Platform::GetStatus(strm);
}

size_t
PlatformFreeBSD::GetSoftwareBreakpointTrapOpcode(Target &target,
                                                 BreakpointSite *bp_site) {
  switch (target.GetArchitecture().GetMachine()) {
  case llvm::Triple::arm: {
    lldb::BreakpointLocationSP bp_loc_sp(bp_site->GetOwnerAtIndex(0));
    AddressClass addr_class = eAddressClassUnknown;

    if (bp_loc_sp) {
      addr_class = bp_loc_sp->GetAddress().GetAddressClass();
      if (addr_class == eAddressClassUnknown &&
          (bp_loc_sp->GetAddress().GetFileAddress() & 1))
        addr_class = eAddressClassCodeAlternateISA;
    }

    if (addr_class == eAddressClassCodeAlternateISA) {
      // TODO: Enable when FreeBSD supports thumb breakpoints.
      // FreeBSD kernel as of 10.x, does not support thumb breakpoints
      return 0;
    }
  }
    LLVM_FALLTHROUGH;
  default:
    return Platform::GetSoftwareBreakpointTrapOpcode(target, bp_site);
  }
}

void PlatformFreeBSD::CalculateTrapHandlerSymbolNames() {
  m_trap_handlers.push_back(ConstString("_sigtramp"));
}

Error PlatformFreeBSD::LaunchProcess(ProcessLaunchInfo &launch_info) {
  Error error;
  if (IsHost()) {
    error = Platform::LaunchProcess(launch_info);
  } else {
    if (m_remote_platform_sp)
      error = m_remote_platform_sp->LaunchProcess(launch_info);
    else
      error.SetErrorString("the platform is not currently connected");
  }
  return error;
}

lldb::ProcessSP PlatformFreeBSD::Attach(ProcessAttachInfo &attach_info,
                                        Debugger &debugger, Target *target,
                                        Error &error) {
  lldb::ProcessSP process_sp;
  if (IsHost()) {
    if (target == NULL) {
      TargetSP new_target_sp;
      ArchSpec emptyArchSpec;

      error = debugger.GetTargetList().CreateTarget(
          debugger, NULL, emptyArchSpec, false, m_remote_platform_sp,
          new_target_sp);
      target = new_target_sp.get();
    } else
      error.Clear();

    if (target && error.Success()) {
      debugger.GetTargetList().SetSelectedTarget(target);
      // The freebsd always currently uses the GDB remote debugger plug-in
      // so even when debugging locally we are debugging remotely!
      // Just like the darwin plugin.
      process_sp = target->CreateProcess(
          attach_info.GetListenerForProcess(debugger), "gdb-remote", NULL);

      if (process_sp)
        error = process_sp->Attach(attach_info);
    }
  } else {
    if (m_remote_platform_sp)
      process_sp =
          m_remote_platform_sp->Attach(attach_info, debugger, target, error);
    else
      error.SetErrorString("the platform is not currently connected");
  }
  return process_sp;
}