0610a25a85
This is a polymorphic class, copying it is a bad idea. This was not a problem because most classes inheriting from it were deleting their copy operations themselves. However, this enables us to delete those explicit deletions, and ensure noone forgets to add them in the future.
285 lines
8.1 KiB
C++
285 lines
8.1 KiB
C++
//===-- PlatformLinux.cpp -------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "PlatformLinux.h"
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#include "lldb/Host/Config.h"
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#include <stdio.h>
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#if LLDB_ENABLE_POSIX
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#include <sys/utsname.h>
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#endif
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#include "lldb/Core/Debugger.h"
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#include "lldb/Core/PluginManager.h"
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#include "lldb/Host/HostInfo.h"
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#include "lldb/Target/Process.h"
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#include "lldb/Target/Target.h"
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#include "lldb/Utility/FileSpec.h"
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#include "lldb/Utility/Log.h"
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#include "lldb/Utility/State.h"
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#include "lldb/Utility/Status.h"
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#include "lldb/Utility/StreamString.h"
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// Define these constants from Linux mman.h for use when targeting remote linux
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// systems even when host has different values.
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#define MAP_PRIVATE 2
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#define MAP_ANON 0x20
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using namespace lldb;
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using namespace lldb_private;
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using namespace lldb_private::platform_linux;
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LLDB_PLUGIN_DEFINE(PlatformLinux)
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static uint32_t g_initialize_count = 0;
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PlatformSP PlatformLinux::CreateInstance(bool force, const ArchSpec *arch) {
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Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PLATFORM));
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LLDB_LOG(log, "force = {0}, arch=({1}, {2})", force,
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arch ? arch->GetArchitectureName() : "<null>",
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arch ? arch->GetTriple().getTriple() : "<null>");
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bool create = force;
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if (!create && arch && arch->IsValid()) {
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const llvm::Triple &triple = arch->GetTriple();
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switch (triple.getOS()) {
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case llvm::Triple::Linux:
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create = true;
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break;
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#if defined(__linux__)
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// Only accept "unknown" for the OS if the host is linux and it "unknown"
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// wasn't specified (it was just returned because it was NOT specified)
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case llvm::Triple::OSType::UnknownOS:
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create = !arch->TripleOSWasSpecified();
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break;
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#endif
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default:
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break;
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}
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}
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LLDB_LOG(log, "create = {0}", create);
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if (create) {
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return PlatformSP(new PlatformLinux(false));
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}
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return PlatformSP();
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}
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ConstString PlatformLinux::GetPluginNameStatic(bool is_host) {
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if (is_host) {
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static ConstString g_host_name(Platform::GetHostPlatformName());
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return g_host_name;
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} else {
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static ConstString g_remote_name("remote-linux");
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return g_remote_name;
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}
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}
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const char *PlatformLinux::GetPluginDescriptionStatic(bool is_host) {
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if (is_host)
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return "Local Linux user platform plug-in.";
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else
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return "Remote Linux user platform plug-in.";
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}
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ConstString PlatformLinux::GetPluginName() {
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return GetPluginNameStatic(IsHost());
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}
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void PlatformLinux::Initialize() {
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PlatformPOSIX::Initialize();
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if (g_initialize_count++ == 0) {
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#if defined(__linux__) && !defined(__ANDROID__)
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PlatformSP default_platform_sp(new PlatformLinux(true));
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default_platform_sp->SetSystemArchitecture(HostInfo::GetArchitecture());
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Platform::SetHostPlatform(default_platform_sp);
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#endif
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PluginManager::RegisterPlugin(
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PlatformLinux::GetPluginNameStatic(false),
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PlatformLinux::GetPluginDescriptionStatic(false),
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PlatformLinux::CreateInstance, nullptr);
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}
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}
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void PlatformLinux::Terminate() {
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if (g_initialize_count > 0) {
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if (--g_initialize_count == 0) {
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PluginManager::UnregisterPlugin(PlatformLinux::CreateInstance);
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}
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}
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PlatformPOSIX::Terminate();
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}
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/// Default Constructor
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PlatformLinux::PlatformLinux(bool is_host)
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: PlatformPOSIX(is_host) // This is the local host platform
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{}
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bool PlatformLinux::GetSupportedArchitectureAtIndex(uint32_t idx,
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ArchSpec &arch) {
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if (IsHost()) {
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ArchSpec hostArch = HostInfo::GetArchitecture(HostInfo::eArchKindDefault);
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if (hostArch.GetTriple().isOSLinux()) {
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if (idx == 0) {
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arch = hostArch;
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return arch.IsValid();
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} else if (idx == 1) {
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// If the default host architecture is 64-bit, look for a 32-bit
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// variant
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if (hostArch.IsValid() && hostArch.GetTriple().isArch64Bit()) {
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arch = HostInfo::GetArchitecture(HostInfo::eArchKind32);
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return arch.IsValid();
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}
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}
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}
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} else {
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if (m_remote_platform_sp)
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return m_remote_platform_sp->GetSupportedArchitectureAtIndex(idx, arch);
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llvm::Triple triple;
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// Set the OS to linux
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triple.setOS(llvm::Triple::Linux);
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// Set the architecture
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switch (idx) {
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case 0:
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triple.setArchName("x86_64");
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break;
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case 1:
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triple.setArchName("i386");
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break;
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case 2:
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triple.setArchName("arm");
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break;
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case 3:
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triple.setArchName("aarch64");
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break;
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case 4:
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triple.setArchName("mips64");
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break;
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case 5:
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triple.setArchName("hexagon");
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break;
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case 6:
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triple.setArchName("mips");
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break;
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case 7:
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triple.setArchName("mips64el");
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break;
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case 8:
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triple.setArchName("mipsel");
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break;
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case 9:
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triple.setArchName("s390x");
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break;
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default:
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return false;
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}
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// Leave the vendor as "llvm::Triple:UnknownVendor" and don't specify the
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// vendor by calling triple.SetVendorName("unknown") so that it is a
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// "unspecified unknown". This means when someone calls
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// triple.GetVendorName() it will return an empty string which indicates
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// that the vendor can be set when two architectures are merged
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// Now set the triple into "arch" and return true
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arch.SetTriple(triple);
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return true;
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}
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return false;
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}
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void PlatformLinux::GetStatus(Stream &strm) {
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Platform::GetStatus(strm);
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#if LLDB_ENABLE_POSIX
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// Display local kernel information only when we are running in host mode.
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// Otherwise, we would end up printing non-Linux information (when running on
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// Mac OS for example).
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if (IsHost()) {
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struct utsname un;
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if (uname(&un))
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return;
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strm.Printf(" Kernel: %s\n", un.sysname);
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strm.Printf(" Release: %s\n", un.release);
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strm.Printf(" Version: %s\n", un.version);
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}
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#endif
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}
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int32_t
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PlatformLinux::GetResumeCountForLaunchInfo(ProcessLaunchInfo &launch_info) {
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int32_t resume_count = 0;
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// Always resume past the initial stop when we use eLaunchFlagDebug
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if (launch_info.GetFlags().Test(eLaunchFlagDebug)) {
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// Resume past the stop for the final exec into the true inferior.
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++resume_count;
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}
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// If we're not launching a shell, we're done.
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const FileSpec &shell = launch_info.GetShell();
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if (!shell)
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return resume_count;
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std::string shell_string = shell.GetPath();
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// We're in a shell, so for sure we have to resume past the shell exec.
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++resume_count;
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// Figure out what shell we're planning on using.
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const char *shell_name = strrchr(shell_string.c_str(), '/');
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if (shell_name == nullptr)
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shell_name = shell_string.c_str();
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else
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shell_name++;
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if (strcmp(shell_name, "csh") == 0 || strcmp(shell_name, "tcsh") == 0 ||
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strcmp(shell_name, "zsh") == 0 || strcmp(shell_name, "sh") == 0) {
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// These shells seem to re-exec themselves. Add another resume.
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++resume_count;
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}
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return resume_count;
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}
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bool PlatformLinux::CanDebugProcess() {
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if (IsHost()) {
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return true;
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} else {
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// If we're connected, we can debug.
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return IsConnected();
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}
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}
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void PlatformLinux::CalculateTrapHandlerSymbolNames() {
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m_trap_handlers.push_back(ConstString("_sigtramp"));
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m_trap_handlers.push_back(ConstString("__kernel_rt_sigreturn"));
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m_trap_handlers.push_back(ConstString("__restore_rt"));
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}
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MmapArgList PlatformLinux::GetMmapArgumentList(const ArchSpec &arch,
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addr_t addr, addr_t length,
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unsigned prot, unsigned flags,
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addr_t fd, addr_t offset) {
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uint64_t flags_platform = 0;
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uint64_t map_anon = arch.IsMIPS() ? 0x800 : MAP_ANON;
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if (flags & eMmapFlagsPrivate)
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flags_platform |= MAP_PRIVATE;
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if (flags & eMmapFlagsAnon)
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flags_platform |= map_anon;
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MmapArgList args({addr, length, prot, flags_platform, fd, offset});
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return args;
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}
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