fuchsia: Implementation of system snapshot

Mostly sensible implementation for x64 via cpuid. It's too early for
Fuchsia to have a version number, so nothing is reported for those
fields. ARM64 isn't implemented at all and would hit a lot of
NOTREACHED()s.

Bug: crashpad:196
Change-Id: I6ca8b12e16fe0cf773a17c88ca9d407b028a501c
Reviewed-on: https://chromium-review.googlesource.com/1005906
Commit-Queue: Scott Graham <scottmg@chromium.org>
Reviewed-by: Joshua Peraza <jperaza@chromium.org>

minidump/minidump_extensions.h

@@ -248,6 +248,9 @@ enum MinidumpOS : uint32_t {
   //! \brief Native Client (NaCl).
   kMinidumpOSNaCl = 0x8205,
 
+  //! \brief Fuchsia.
+  kMinidumpOSFuchsia = 0x8206,
+
   //! \brief Unknown operating system.
   kMinidumpOSUnknown = 0xffffffff,
 };

minidump/minidump_system_info_writer.cc

@@ -172,6 +172,9 @@ void MinidumpSystemInfoWriter::InitializeFromSnapshot(
     case SystemSnapshot::kOperatingSystemAndroid:
       operating_system = kMinidumpOSAndroid;
       break;
+    case SystemSnapshot::kOperatingSystemFuchsia:
+      operating_system = kMinidumpOSFuchsia;
+      break;
     default:
       NOTREACHED();
       operating_system = kMinidumpOSUnknown;

snapshot/BUILD.gn

@@ -180,6 +180,8 @@ static_library("snapshot") {
       "fuchsia/process_reader_fuchsia.h",
       "fuchsia/process_snapshot_fuchsia.cc",
       "fuchsia/process_snapshot_fuchsia.h",
+      "fuchsia/system_snapshot_fuchsia.cc",
+      "fuchsia/system_snapshot_fuchsia.h",
       "fuchsia/thread_snapshot_fuchsia.cc",
       "fuchsia/thread_snapshot_fuchsia.h",
     ]

snapshot/fuchsia/process_snapshot_fuchsia.cc

@@ -34,6 +34,8 @@ bool ProcessSnapshotFuchsia::Initialize(zx_handle_t process) {
     return false;
   }
 
+  system_.Initialize(&snapshot_time_);
+
   InitializeThreads();
   InitializeModules();
 
@@ -125,8 +127,7 @@ ProcessSnapshotFuchsia::AnnotationsSimpleMap() const {
 
 const SystemSnapshot* ProcessSnapshotFuchsia::System() const {
   INITIALIZATION_STATE_DCHECK_VALID(initialized_);
-  NOTREACHED();  // TODO(scottmg): https://crashpad.chromium.org/bug/196
-  return nullptr;
+  return &system_;
 }
 
 std::vector<const ThreadSnapshot*> ProcessSnapshotFuchsia::Threads() const {

snapshot/fuchsia/process_snapshot_fuchsia.h

@@ -26,6 +26,7 @@
 #include "snapshot/elf/elf_image_reader.h"
 #include "snapshot/elf/module_snapshot_elf.h"
 #include "snapshot/fuchsia/process_reader_fuchsia.h"
+#include "snapshot/fuchsia/system_snapshot_fuchsia.h"
 #include "snapshot/fuchsia/thread_snapshot_fuchsia.h"
 #include "snapshot/process_snapshot.h"
 #include "snapshot/unloaded_module_snapshot.h"
@@ -81,6 +82,7 @@ class ProcessSnapshotFuchsia : public ProcessSnapshot {
   // Initializes modules_ on behalf of Initialize().
   void InitializeModules();
 
+  internal::SystemSnapshotFuchsia system_;
   std::vector<std::unique_ptr<internal::ThreadSnapshotFuchsia>> threads_;
   std::vector<std::unique_ptr<internal::ModuleSnapshotElf>> modules_;
   ProcessReaderFuchsia process_reader_;

snapshot/fuchsia/system_snapshot_fuchsia.cc

@@ -0,0 +1,207 @@
+// Copyright 2018 The Crashpad Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "snapshot/fuchsia/system_snapshot_fuchsia.h"
+
+#include <sys/utsname.h>
+#include <zircon/syscalls.h>
+
+#include "base/logging.h"
+#include "base/numerics/safe_conversions.h"
+#include "base/strings/stringprintf.h"
+#include "snapshot/posix/timezone.h"
+
+namespace crashpad {
+namespace internal {
+
+SystemSnapshotFuchsia::SystemSnapshotFuchsia() = default;
+
+SystemSnapshotFuchsia::~SystemSnapshotFuchsia() = default;
+
+void SystemSnapshotFuchsia::Initialize(const timeval* snapshot_time) {
+  INITIALIZATION_STATE_SET_INITIALIZING(initialized_);
+
+  snapshot_time_ = snapshot_time;
+
+  std::string uname_string;
+  utsname uts;
+  if (uname(&uts) != 0) {
+    PLOG(WARNING) << "uname";
+  } else {
+    uname_string = base::StringPrintf("%s %s", uts.sysname, uts.machine);
+  }
+
+  // TODO(scottmg): There's no version available to be reported yet.
+
+  os_version_full_ = uname_string;
+
+  INITIALIZATION_STATE_SET_VALID(initialized_);
+}
+
+CPUArchitecture SystemSnapshotFuchsia::GetCPUArchitecture() const {
+  INITIALIZATION_STATE_DCHECK_VALID(initialized_);
+
+#if defined(ARCH_CPU_X86_64)
+  return kCPUArchitectureX86_64;
+#elif defined(ARCH_CPU_ARM64)
+  return kCPUArchitectureARM64;
+#else
+#error Port
+#endif
+}
+
+uint32_t SystemSnapshotFuchsia::CPURevision() const {
+  INITIALIZATION_STATE_DCHECK_VALID(initialized_);
+#if defined(ARCH_CPU_X86_64)
+  return cpuid_.Revision();
+#else
+  NOTREACHED();  // TODO(scottmg): https://crashpad.chromium.org/bug/196.
+  return 0;
+#endif
+}
+
+uint8_t SystemSnapshotFuchsia::CPUCount() const {
+  INITIALIZATION_STATE_DCHECK_VALID(initialized_);
+  return base::saturated_cast<uint8_t>(zx_system_get_num_cpus());
+}
+
+std::string SystemSnapshotFuchsia::CPUVendor() const {
+  INITIALIZATION_STATE_DCHECK_VALID(initialized_);
+#if defined(ARCH_CPU_X86_64)
+  return cpuid_.Vendor();
+#else
+  NOTREACHED();  // TODO(scottmg): https://crashpad.chromium.org/bug/196.
+  return std::string();
+#endif
+}
+
+void SystemSnapshotFuchsia::CPUFrequency(uint64_t* current_hz,
+                                         uint64_t* max_hz) const {
+  INITIALIZATION_STATE_DCHECK_VALID(initialized_);
+  // TODO(scottmg): https://crashpad.chromium.org/bug/196.
+  *current_hz = 0;
+  *max_hz = 0;
+}
+
+uint32_t SystemSnapshotFuchsia::CPUX86Signature() const {
+  INITIALIZATION_STATE_DCHECK_VALID(initialized_);
+#if defined(ARCH_CPU_X86_64)
+  return cpuid_.Signature();
+#else
+  NOTREACHED();  // TODO(scottmg): https://crashpad.chromium.org/bug/196.
+  return 0;
+#endif
+}
+
+uint64_t SystemSnapshotFuchsia::CPUX86Features() const {
+  INITIALIZATION_STATE_DCHECK_VALID(initialized_);
+#if defined(ARCH_CPU_X86_64)
+  return cpuid_.Features();
+#else
+  NOTREACHED();  // TODO(scottmg): https://crashpad.chromium.org/bug/196.
+  return 0;
+#endif
+}
+
+uint64_t SystemSnapshotFuchsia::CPUX86ExtendedFeatures() const {
+  INITIALIZATION_STATE_DCHECK_VALID(initialized_);
+#if defined(ARCH_CPU_X86_64)
+  return cpuid_.ExtendedFeatures();
+#else
+  NOTREACHED();  // TODO(scottmg): https://crashpad.chromium.org/bug/196.
+  return 0;
+#endif
+}
+
+uint32_t SystemSnapshotFuchsia::CPUX86Leaf7Features() const {
+#if defined(ARCH_CPU_X86_64)
+  return cpuid_.Leaf7Features();
+#else
+  NOTREACHED();  // TODO(scottmg): https://crashpad.chromium.org/bug/196.
+  return 0;
+#endif
+}
+
+bool SystemSnapshotFuchsia::CPUX86SupportsDAZ() const {
+  INITIALIZATION_STATE_DCHECK_VALID(initialized_);
+#if defined(ARCH_CPU_X86_64)
+  return cpuid_.SupportsDAZ();
+#else
+  NOTREACHED();  // TODO(scottmg): https://crashpad.chromium.org/bug/196.
+  return false;
+#endif
+}
+
+SystemSnapshot::OperatingSystem SystemSnapshotFuchsia::GetOperatingSystem()
+    const {
+  INITIALIZATION_STATE_DCHECK_VALID(initialized_);
+  return kOperatingSystemFuchsia;
+}
+
+bool SystemSnapshotFuchsia::OSServer() const {
+  INITIALIZATION_STATE_DCHECK_VALID(initialized_);
+  return false;
+}
+
+void SystemSnapshotFuchsia::OSVersion(int* major,
+                                      int* minor,
+                                      int* bugfix,
+                                      std::string* build) const {
+  INITIALIZATION_STATE_DCHECK_VALID(initialized_);
+  // TODO(scottmg): https://crashpad.chromium.org/bug/196. There's no version
+  // available to be reported yet.
+  *major = 0;
+  *minor = 0;
+  *bugfix = 0;
+  *build = std::string();
+}
+
+std::string SystemSnapshotFuchsia::OSVersionFull() const {
+  INITIALIZATION_STATE_DCHECK_VALID(initialized_);
+  return os_version_full_;
+}
+
+std::string SystemSnapshotFuchsia::MachineDescription() const {
+  INITIALIZATION_STATE_DCHECK_VALID(initialized_);
+  NOTREACHED();  // TODO(scottmg): https://crashpad.chromium.org/bug/196.
+  return std::string();
+}
+
+bool SystemSnapshotFuchsia::NXEnabled() const {
+  INITIALIZATION_STATE_DCHECK_VALID(initialized_);
+#if defined(ARCH_CPU_X86_64)
+  return cpuid_.NXEnabled();
+#else
+  NOTREACHED();  // TODO(scottmg): https://crashpad.chromium.org/bug/196.
+  return false;
+#endif
+}
+
+void SystemSnapshotFuchsia::TimeZone(DaylightSavingTimeStatus* dst_status,
+                                     int* standard_offset_seconds,
+                                     int* daylight_offset_seconds,
+                                     std::string* standard_name,
+                                     std::string* daylight_name) const {
+  INITIALIZATION_STATE_DCHECK_VALID(initialized_);
+
+  internal::TimeZone(*snapshot_time_,
+                     dst_status,
+                     standard_offset_seconds,
+                     daylight_offset_seconds,
+                     standard_name,
+                     daylight_name);
+}
+
+}  // namespace internal
+}  // namespace crashpad

snapshot/fuchsia/system_snapshot_fuchsia.h

@@ -0,0 +1,87 @@
+// Copyright 2018 The Crashpad Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef CRASHPAD_SNAPSHOT_FUCHSIA_SYSTEM_SNAPSHOT_FUCHSIA_H_
+#define CRASHPAD_SNAPSHOT_FUCHSIA_SYSTEM_SNAPSHOT_FUCHSIA_H_
+
+#include <sys/time.h>
+
+#include "base/macros.h"
+#include "build/build_config.h"
+#include "snapshot/system_snapshot.h"
+#include "util/misc/initialization_state_dcheck.h"
+
+#if defined(ARCH_CPU_X86_FAMILY)
+#include "snapshot/x86/cpuid_reader.h"
+#endif
+
+namespace crashpad {
+namespace internal {
+
+//! \brief A SystemSnapshot of the running system, when the system runs Fuchsia.
+class SystemSnapshotFuchsia final : public SystemSnapshot {
+ public:
+  SystemSnapshotFuchsia();
+  ~SystemSnapshotFuchsia() override;
+
+  //! \brief Initializes the object.
+  //!
+  //! \param[in] snapshot_time The time of the snapshot being taken.
+  //!
+  //! This parameter is necessary for TimeZone() to determine whether daylight
+  //! saving time was in effect at the time the snapshot was taken. Otherwise,
+  //! it would need to base its determination on the current time, which may be
+  //! different than the snapshot time for snapshots generated around the
+  //! daylight saving transition time.
+  void Initialize(const timeval* snapshot_time);
+
+  // SystemSnapshot:
+
+  CPUArchitecture GetCPUArchitecture() const override;
+  uint32_t CPURevision() const override;
+  uint8_t CPUCount() const override;
+  std::string CPUVendor() const override;
+  void CPUFrequency(uint64_t* current_hz, uint64_t* max_hz) const override;
+  uint32_t CPUX86Signature() const override;
+  uint64_t CPUX86Features() const override;
+  uint64_t CPUX86ExtendedFeatures() const override;
+  uint32_t CPUX86Leaf7Features() const override;
+  bool CPUX86SupportsDAZ() const override;
+  OperatingSystem GetOperatingSystem() const override;
+  bool OSServer() const override;
+  void OSVersion(
+      int* major, int* minor, int* bugfix, std::string* build) const override;
+  std::string OSVersionFull() const override;
+  bool NXEnabled() const override;
+  std::string MachineDescription() const override;
+  void TimeZone(DaylightSavingTimeStatus* dst_status,
+                int* standard_offset_seconds,
+                int* daylight_offset_seconds,
+                std::string* standard_name,
+                std::string* daylight_name) const override;
+ private:
+  std::string os_version_full_;
+  const timeval* snapshot_time_;  // weak
+#if defined(ARCH_CPU_X86_FAMILY)
+  CpuidReader cpuid_;
+#endif  // ARCH_CPU_X86_FAMILY
+  InitializationStateDcheck initialized_;
+
+  DISALLOW_COPY_AND_ASSIGN(SystemSnapshotFuchsia);
+};
+
+}  // namespace internal
+}  // namespace crashpad
+
+#endif  // CRASHPAD_SNAPSHOT_FUCHSIA_SYSTEM_SNAPSHOT_FUCHSIA_H_

snapshot/system_snapshot.h

@@ -47,6 +47,9 @@ class SystemSnapshot {
 
     //! \brief Android.
     kOperatingSystemAndroid,
+
+    //! \brief Fuchsia.
+    kOperatingSystemFuchsia,
   };
 
   //! \brief A system’s daylight saving time status.