8d5a6007f9
On macOS, a process will be launched with /usr/lib/dyld (the dynamic linker) and the main binary by the kernel. The first thing the standalone dyld will do is call into the dyld in the shared cache image. This patch tracks the transition between the dyld's at the very beginning of process startup. In DynamicLoaderMacOS::NotifyBreakpointHit() there are two new cases handled: `dyld_image_dyld_moved` which is the launch /usr/lib/dyld indicating that it is about call into the shared cache dyld ane evict itself. lldb will remove the notification breakpoint it set, clear the binary image list entirely, get the notification function pointer value out of the dyld_all_image_infos struct (which is the notification fptr in the to-be-run shared-cache dyld) and put an address breakpoint there. `dyld_notify_adding` is then called by shared-cache dyld, and we detect this case by noticing that we have an empty binary image list, normally impossibe, and treating this as if we'd just started a process attach/launch. Differential Revision: https://reviews.llvm.org/D127247 rdar://84222158
112 lines
4.0 KiB
C++
112 lines
4.0 KiB
C++
//===-- DynamicLoaderMacOS.h -------------------------------*- C++ -*-===//
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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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// This is the DynamicLoader plugin for Darwin (macOS / iPhoneOS / tvOS /
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// watchOS / BridgeOS)
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// platforms late 2016 and newer, where lldb will call dyld SPI functions to get
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// information about shared libraries, information about the shared cache, and
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// the _dyld_debugger_notification function we put a breakpoint on give us an
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// array of load addresses for solibs loaded and unloaded. The SPI will tell us
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// about both dyld and the executable, in addition to all of the usual solibs.
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#ifndef LLDB_SOURCE_PLUGINS_DYNAMICLOADER_MACOSX_DYLD_DYNAMICLOADERMACOS_H
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#define LLDB_SOURCE_PLUGINS_DYNAMICLOADER_MACOSX_DYLD_DYNAMICLOADERMACOS_H
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#include <mutex>
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#include <vector>
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#include "lldb/Target/DynamicLoader.h"
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#include "lldb/Target/Process.h"
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#include "lldb/Utility/FileSpec.h"
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#include "lldb/Utility/StructuredData.h"
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#include "lldb/Utility/UUID.h"
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#include "DynamicLoaderDarwin.h"
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class DynamicLoaderMacOS : public lldb_private::DynamicLoaderDarwin {
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public:
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DynamicLoaderMacOS(lldb_private::Process *process);
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~DynamicLoaderMacOS() override;
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// Static Functions
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static void Initialize();
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static void Terminate();
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static llvm::StringRef GetPluginNameStatic() { return "macos-dyld"; }
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static llvm::StringRef GetPluginDescriptionStatic();
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static lldb_private::DynamicLoader *
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CreateInstance(lldb_private::Process *process, bool force);
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/// Called after attaching a process.
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///
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/// Allow DynamicLoader plug-ins to execute some code after
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/// attaching to a process.
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bool ProcessDidExec() override;
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lldb_private::Status CanLoadImage() override;
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bool GetSharedCacheInformation(
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lldb::addr_t &base_address, lldb_private::UUID &uuid,
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lldb_private::LazyBool &using_shared_cache,
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lldb_private::LazyBool &private_shared_cache) override;
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// PluginInterface protocol
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llvm::StringRef GetPluginName() override { return GetPluginNameStatic(); }
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protected:
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void PutToLog(lldb_private::Log *log) const;
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void DoInitialImageFetch() override;
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bool NeedToDoInitialImageFetch() override;
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bool DidSetNotificationBreakpoint() override;
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bool SetDYLDHandoverBreakpoint(lldb::addr_t notification_address);
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void ClearDYLDHandoverBreakpoint();
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void AddBinaries(const std::vector<lldb::addr_t> &load_addresses);
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void DoClear() override;
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static bool
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NotifyBreakpointHit(void *baton,
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lldb_private::StoppointCallbackContext *context,
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lldb::user_id_t break_id, lldb::user_id_t break_loc_id);
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bool SetNotificationBreakpoint() override;
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void ClearNotificationBreakpoint() override;
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void UpdateImageInfosHeaderAndLoadCommands(ImageInfo::collection &image_infos,
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uint32_t infos_count,
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bool update_executable);
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lldb::addr_t
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GetDyldLockVariableAddressFromModule(lldb_private::Module *module);
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uint32_t m_image_infos_stop_id; // The Stop ID the last time we
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// loaded/unloaded images
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lldb::user_id_t m_break_id;
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lldb::user_id_t m_dyld_handover_break_id;
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mutable std::recursive_mutex m_mutex;
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lldb::addr_t m_maybe_image_infos_address; // If dyld is still maintaining the
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// all_image_infos address, store it
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// here so we can use it to detect
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// exec's when talking to
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// debugservers that don't support
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// the "reason:exec" annotation.
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};
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#endif // LLDB_SOURCE_PLUGINS_DYNAMICLOADER_MACOSX_DYLD_DYNAMICLOADERMACOS_H
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