aboutsummaryrefslogtreecommitdiff
path: root/source/Plugins/Process/elf-core/ProcessElfCore.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'source/Plugins/Process/elf-core/ProcessElfCore.cpp')
-rw-r--r--source/Plugins/Process/elf-core/ProcessElfCore.cpp496
1 files changed, 259 insertions, 237 deletions
diff --git a/source/Plugins/Process/elf-core/ProcessElfCore.cpp b/source/Plugins/Process/elf-core/ProcessElfCore.cpp
index 71eb6437ceed..7d6a0c9ad2df 100644
--- a/source/Plugins/Process/elf-core/ProcessElfCore.cpp
+++ b/source/Plugins/Process/elf-core/ProcessElfCore.cpp
@@ -32,8 +32,7 @@
#include "Plugins/DynamicLoader/POSIX-DYLD/DynamicLoaderPOSIXDYLD.h"
#include "Plugins/ObjectFile/ELF/ObjectFileELF.h"
-
-// Project includes
+#include "Plugins/Process/elf-core/RegisterUtilities.h"
#include "ProcessElfCore.h"
#include "ThreadElfCore.h"
@@ -101,10 +100,7 @@ bool ProcessElfCore::CanDebug(lldb::TargetSP target_sp,
ProcessElfCore::ProcessElfCore(lldb::TargetSP target_sp,
lldb::ListenerSP listener_sp,
const FileSpec &core_file)
- : Process(target_sp, listener_sp), m_core_module_sp(),
- m_core_file(core_file), m_dyld_plugin_name(),
- m_os(llvm::Triple::UnknownOS), m_thread_data_valid(false),
- m_thread_data(), m_core_aranges() {}
+ : Process(target_sp, listener_sp), m_core_file(core_file) {}
//----------------------------------------------------------------------
// Destructor
@@ -193,9 +189,8 @@ Status ProcessElfCore::DoLoadCore() {
// Parse thread contexts and auxv structure
if (header->p_type == llvm::ELF::PT_NOTE) {
- error = ParseThreadContextsFromNoteSegment(header, data);
- if (error.Fail())
- return error;
+ if (llvm::Error error = ParseThreadContextsFromNoteSegment(header, data))
+ return Status(std::move(error));
}
// PT_LOAD segments contains address map
if (header->p_type == llvm::ELF::PT_LOAD) {
@@ -404,7 +399,6 @@ size_t ProcessElfCore::DoReadMemory(lldb::addr_t addr, void *buf, size_t size,
void ProcessElfCore::Clear() {
m_thread_list.Clear();
- m_os = llvm::Triple::UnknownOS;
SetUnixSignals(std::make_shared<UnixSignals>());
}
@@ -427,43 +421,10 @@ lldb::addr_t ProcessElfCore::GetImageInfoAddress() {
return LLDB_INVALID_ADDRESS;
}
-/// Core files PT_NOTE segment descriptor types
-enum {
- NT_PRSTATUS = 1,
- NT_FPREGSET,
- NT_PRPSINFO,
- NT_TASKSTRUCT,
- NT_PLATFORM,
- NT_AUXV,
- NT_FILE = 0x46494c45,
- NT_PRXFPREG = 0x46e62b7f,
- NT_SIGINFO = 0x53494749,
- NT_OPENBSD_PROCINFO = 10,
- NT_OPENBSD_AUXV = 11,
- NT_OPENBSD_REGS = 20,
- NT_OPENBSD_FPREGS = 21,
-};
-
-namespace FREEBSD {
-
-enum {
- NT_PRSTATUS = 1,
- NT_FPREGSET,
- NT_PRPSINFO,
- NT_THRMISC = 7,
- NT_PROCSTAT_AUXV = 16,
- NT_PPC_VMX = 0x100
-};
-}
-
-namespace NETBSD {
-
-enum { NT_PROCINFO = 1, NT_AUXV, NT_AMD64_REGS = 33, NT_AMD64_FPREGS = 35 };
-}
-
// Parse a FreeBSD NT_PRSTATUS note - see FreeBSD sys/procfs.h for details.
-static void ParseFreeBSDPrStatus(ThreadData &thread_data, DataExtractor &data,
- ArchSpec &arch) {
+static void ParseFreeBSDPrStatus(ThreadData &thread_data,
+ const DataExtractor &data,
+ const ArchSpec &arch) {
lldb::offset_t offset = 0;
bool lp64 = (arch.GetMachine() == llvm::Triple::aarch64 ||
arch.GetMachine() == llvm::Triple::mips64 ||
@@ -492,12 +453,8 @@ static void ParseFreeBSDPrStatus(ThreadData &thread_data, DataExtractor &data,
thread_data.gpregset = DataExtractor(data, offset, len);
}
-static void ParseFreeBSDThrMisc(ThreadData &thread_data, DataExtractor &data) {
- lldb::offset_t offset = 0;
- thread_data.name = data.GetCStr(&offset, 20);
-}
-
-static void ParseNetBSDProcInfo(ThreadData &thread_data, DataExtractor &data) {
+static void ParseNetBSDProcInfo(ThreadData &thread_data,
+ const DataExtractor &data) {
lldb::offset_t offset = 0;
int version = data.GetU32(&offset);
@@ -508,7 +465,8 @@ static void ParseNetBSDProcInfo(ThreadData &thread_data, DataExtractor &data) {
thread_data.signo = data.GetU32(&offset);
}
-static void ParseOpenBSDProcInfo(ThreadData &thread_data, DataExtractor &data) {
+static void ParseOpenBSDProcInfo(ThreadData &thread_data,
+ const DataExtractor &data) {
lldb::offset_t offset = 0;
int version = data.GetU32(&offset);
@@ -519,202 +477,263 @@ static void ParseOpenBSDProcInfo(ThreadData &thread_data, DataExtractor &data) {
thread_data.signo = data.GetU32(&offset);
}
-/// Parse Thread context from PT_NOTE segment and store it in the thread list
-/// Notes:
-/// 1) A PT_NOTE segment is composed of one or more NOTE entries.
-/// 2) NOTE Entry contains a standard header followed by variable size data.
-/// (see ELFNote structure)
-/// 3) A Thread Context in a core file usually described by 3 NOTE entries.
-/// a) NT_PRSTATUS - Register context
-/// b) NT_PRPSINFO - Process info(pid..)
-/// c) NT_FPREGSET - Floating point registers
-/// 4) The NOTE entries can be in any order
-/// 5) If a core file contains multiple thread contexts then there is two data
-/// forms
-/// a) Each thread context(2 or more NOTE entries) contained in its own
-/// segment (PT_NOTE)
-/// b) All thread context is stored in a single segment(PT_NOTE).
-/// This case is little tricker since while parsing we have to find where
-/// the
-/// new thread starts. The current implementation marks beginning of
-/// new thread when it finds NT_PRSTATUS or NT_PRPSINFO NOTE entry.
-/// For case (b) there may be either one NT_PRPSINFO per thread, or a single
-/// one that applies to all threads (depending on the platform type).
-Status ProcessElfCore::ParseThreadContextsFromNoteSegment(
- const elf::ELFProgramHeader *segment_header, DataExtractor segment_data) {
- assert(segment_header && segment_header->p_type == llvm::ELF::PT_NOTE);
-
+llvm::Expected<std::vector<CoreNote>>
+ProcessElfCore::parseSegment(const DataExtractor &segment) {
lldb::offset_t offset = 0;
- std::unique_ptr<ThreadData> thread_data(new ThreadData);
+ std::vector<CoreNote> result;
+
+ while (offset < segment.GetByteSize()) {
+ ELFNote note = ELFNote();
+ if (!note.Parse(segment, &offset))
+ return llvm::make_error<llvm::StringError>(
+ "Unable to parse note segment", llvm::inconvertibleErrorCode());
+
+ size_t note_start = offset;
+ size_t note_size = llvm::alignTo(note.n_descsz, 4);
+ DataExtractor note_data(segment, note_start, note_size);
+
+ result.push_back({note, note_data});
+ offset += note_size;
+ }
+
+ return std::move(result);
+}
+
+llvm::Error ProcessElfCore::parseFreeBSDNotes(llvm::ArrayRef<CoreNote> notes) {
bool have_prstatus = false;
bool have_prpsinfo = false;
+ ThreadData thread_data;
+ for (const auto &note : notes) {
+ if (note.info.n_name != "FreeBSD")
+ continue;
- ArchSpec arch = GetArchitecture();
- ELFLinuxPrPsInfo prpsinfo;
- ELFLinuxPrStatus prstatus;
- ELFLinuxSigInfo siginfo;
- size_t header_size;
- size_t len;
- Status error;
+ if ((note.info.n_type == FREEBSD::NT_PRSTATUS && have_prstatus) ||
+ (note.info.n_type == FREEBSD::NT_PRPSINFO && have_prpsinfo)) {
+ assert(thread_data.gpregset.GetByteSize() > 0);
+ // Add the new thread to thread list
+ m_thread_data.push_back(thread_data);
+ thread_data = ThreadData();
+ have_prstatus = false;
+ have_prpsinfo = false;
+ }
- // Loop through the NOTE entires in the segment
- while (offset < segment_header->p_filesz) {
- ELFNote note = ELFNote();
- note.Parse(segment_data, &offset);
+ switch (note.info.n_type) {
+ case FREEBSD::NT_PRSTATUS:
+ have_prstatus = true;
+ ParseFreeBSDPrStatus(thread_data, note.data, GetArchitecture());
+ break;
+ case FREEBSD::NT_PRPSINFO:
+ have_prpsinfo = true;
+ break;
+ case FREEBSD::NT_THRMISC: {
+ lldb::offset_t offset = 0;
+ thread_data.name = note.data.GetCStr(&offset, 20);
+ break;
+ }
+ case FREEBSD::NT_PROCSTAT_AUXV:
+ // FIXME: FreeBSD sticks an int at the beginning of the note
+ m_auxv = DataExtractor(note.data, 4, note.data.GetByteSize() - 4);
+ break;
+ default:
+ thread_data.notes.push_back(note);
+ break;
+ }
+ }
+ if (!have_prstatus) {
+ return llvm::make_error<llvm::StringError>(
+ "Could not find NT_PRSTATUS note in core file.",
+ llvm::inconvertibleErrorCode());
+ }
+ m_thread_data.push_back(thread_data);
+ return llvm::Error::success();
+}
+
+llvm::Error ProcessElfCore::parseNetBSDNotes(llvm::ArrayRef<CoreNote> notes) {
+ ThreadData thread_data;
+ for (const auto &note : notes) {
+ // NetBSD per-thread information is stored in notes named
+ // "NetBSD-CORE@nnn" so match on the initial part of the string.
+ if (!llvm::StringRef(note.info.n_name).startswith("NetBSD-CORE"))
+ continue;
- // Beginning of new thread
- if ((note.n_type == NT_PRSTATUS && have_prstatus) ||
- (note.n_type == NT_PRPSINFO && have_prpsinfo)) {
- assert(thread_data->gpregset.GetByteSize() > 0);
+ switch (note.info.n_type) {
+ case NETBSD::NT_PROCINFO:
+ ParseNetBSDProcInfo(thread_data, note.data);
+ break;
+ case NETBSD::NT_AUXV:
+ m_auxv = note.data;
+ break;
+
+ case NETBSD::NT_AMD64_REGS:
+ if (GetArchitecture().GetMachine() == llvm::Triple::x86_64)
+ thread_data.gpregset = note.data;
+ break;
+ default:
+ thread_data.notes.push_back(note);
+ break;
+ }
+ }
+ if (thread_data.gpregset.GetByteSize() == 0) {
+ return llvm::make_error<llvm::StringError>(
+ "Could not find general purpose registers note in core file.",
+ llvm::inconvertibleErrorCode());
+ }
+ m_thread_data.push_back(thread_data);
+ return llvm::Error::success();
+}
+
+llvm::Error ProcessElfCore::parseOpenBSDNotes(llvm::ArrayRef<CoreNote> notes) {
+ ThreadData thread_data;
+ for (const auto &note : notes) {
+ // OpenBSD per-thread information is stored in notes named
+ // "OpenBSD@nnn" so match on the initial part of the string.
+ if (!llvm::StringRef(note.info.n_name).startswith("OpenBSD"))
+ continue;
+
+ switch (note.info.n_type) {
+ case OPENBSD::NT_PROCINFO:
+ ParseOpenBSDProcInfo(thread_data, note.data);
+ break;
+ case OPENBSD::NT_AUXV:
+ m_auxv = note.data;
+ break;
+ case OPENBSD::NT_REGS:
+ thread_data.gpregset = note.data;
+ break;
+ default:
+ thread_data.notes.push_back(note);
+ break;
+ }
+ }
+ if (thread_data.gpregset.GetByteSize() == 0) {
+ return llvm::make_error<llvm::StringError>(
+ "Could not find general purpose registers note in core file.",
+ llvm::inconvertibleErrorCode());
+ }
+ m_thread_data.push_back(thread_data);
+ return llvm::Error::success();
+}
+
+/// A description of a linux process usually contains the following NOTE
+/// entries:
+/// - NT_PRPSINFO - General process information like pid, uid, name, ...
+/// - NT_SIGINFO - Information about the signal that terminated the process
+/// - NT_AUXV - Process auxiliary vector
+/// - NT_FILE - Files mapped into memory
+///
+/// Additionally, for each thread in the process the core file will contain at
+/// least the NT_PRSTATUS note, containing the thread id and general purpose
+/// registers. It may include additional notes for other register sets (floating
+/// point and vector registers, ...). The tricky part here is that some of these
+/// notes have "CORE" in their owner fields, while other set it to "LINUX".
+llvm::Error ProcessElfCore::parseLinuxNotes(llvm::ArrayRef<CoreNote> notes) {
+ const ArchSpec &arch = GetArchitecture();
+ bool have_prstatus = false;
+ bool have_prpsinfo = false;
+ ThreadData thread_data;
+ for (const auto &note : notes) {
+ if (note.info.n_name != "CORE" && note.info.n_name != "LINUX")
+ continue;
+
+ if ((note.info.n_type == LINUX::NT_PRSTATUS && have_prstatus) ||
+ (note.info.n_type == LINUX::NT_PRPSINFO && have_prpsinfo)) {
+ assert(thread_data.gpregset.GetByteSize() > 0);
// Add the new thread to thread list
- m_thread_data.push_back(*thread_data);
- *thread_data = ThreadData();
+ m_thread_data.push_back(thread_data);
+ thread_data = ThreadData();
have_prstatus = false;
have_prpsinfo = false;
}
- size_t note_start, note_size;
- note_start = offset;
- note_size = llvm::alignTo(note.n_descsz, 4);
-
- // Store the NOTE information in the current thread
- DataExtractor note_data(segment_data, note_start, note_size);
- note_data.SetAddressByteSize(
- m_core_module_sp->GetArchitecture().GetAddressByteSize());
- if (note.n_name == "FreeBSD") {
- m_os = llvm::Triple::FreeBSD;
- switch (note.n_type) {
- case FREEBSD::NT_PRSTATUS:
- have_prstatus = true;
- ParseFreeBSDPrStatus(*thread_data, note_data, arch);
- break;
- case FREEBSD::NT_FPREGSET:
- thread_data->fpregset = note_data;
- break;
- case FREEBSD::NT_PRPSINFO:
- have_prpsinfo = true;
- break;
- case FREEBSD::NT_THRMISC:
- ParseFreeBSDThrMisc(*thread_data, note_data);
- break;
- case FREEBSD::NT_PROCSTAT_AUXV:
- // FIXME: FreeBSD sticks an int at the beginning of the note
- m_auxv = DataExtractor(segment_data, note_start + 4, note_size - 4);
- break;
- case FREEBSD::NT_PPC_VMX:
- thread_data->vregset = note_data;
- break;
- default:
- break;
- }
- } else if (note.n_name.substr(0, 11) == "NetBSD-CORE") {
- // NetBSD per-thread information is stored in notes named
- // "NetBSD-CORE@nnn" so match on the initial part of the string.
- m_os = llvm::Triple::NetBSD;
- if (note.n_type == NETBSD::NT_PROCINFO) {
- ParseNetBSDProcInfo(*thread_data, note_data);
- } else if (note.n_type == NETBSD::NT_AUXV) {
- m_auxv = DataExtractor(note_data);
- } else if (arch.GetMachine() == llvm::Triple::x86_64 &&
- note.n_type == NETBSD::NT_AMD64_REGS) {
- thread_data->gpregset = note_data;
- } else if (arch.GetMachine() == llvm::Triple::x86_64 &&
- note.n_type == NETBSD::NT_AMD64_FPREGS) {
- thread_data->fpregset = note_data;
- }
- } else if (note.n_name.substr(0, 7) == "OpenBSD") {
- // OpenBSD per-thread information is stored in notes named
- // "OpenBSD@nnn" so match on the initial part of the string.
- m_os = llvm::Triple::OpenBSD;
- switch (note.n_type) {
- case NT_OPENBSD_PROCINFO:
- ParseOpenBSDProcInfo(*thread_data, note_data);
- break;
- case NT_OPENBSD_AUXV:
- m_auxv = DataExtractor(note_data);
- break;
- case NT_OPENBSD_REGS:
- thread_data->gpregset = note_data;
- break;
- case NT_OPENBSD_FPREGS:
- thread_data->fpregset = note_data;
- break;
- }
- } else if (note.n_name == "CORE") {
- switch (note.n_type) {
- case NT_PRSTATUS:
- have_prstatus = true;
- error = prstatus.Parse(note_data, arch);
- if (error.Fail())
- return error;
- thread_data->prstatus_sig = prstatus.pr_cursig;
- thread_data->tid = prstatus.pr_pid;
- header_size = ELFLinuxPrStatus::GetSize(arch);
- len = note_data.GetByteSize() - header_size;
- thread_data->gpregset = DataExtractor(note_data, header_size, len);
- break;
- case NT_FPREGSET:
- // In a i386 core file NT_FPREGSET is present, but it's not the result
- // of the FXSAVE instruction like in 64 bit files.
- // The result from FXSAVE is in NT_PRXFPREG for i386 core files
- if (arch.GetCore() == ArchSpec::eCore_x86_64_x86_64)
- thread_data->fpregset = note_data;
- else if(arch.IsMIPS())
- thread_data->fpregset = note_data;
- break;
- case NT_PRPSINFO:
- have_prpsinfo = true;
- error = prpsinfo.Parse(note_data, arch);
- if (error.Fail())
- return error;
- thread_data->name = prpsinfo.pr_fname;
- SetID(prpsinfo.pr_pid);
- break;
- case NT_AUXV:
- m_auxv = DataExtractor(note_data);
- break;
- case NT_FILE: {
- m_nt_file_entries.clear();
- lldb::offset_t offset = 0;
- const uint64_t count = note_data.GetAddress(&offset);
- note_data.GetAddress(&offset); // Skip page size
- for (uint64_t i = 0; i < count; ++i) {
- NT_FILE_Entry entry;
- entry.start = note_data.GetAddress(&offset);
- entry.end = note_data.GetAddress(&offset);
- entry.file_ofs = note_data.GetAddress(&offset);
- m_nt_file_entries.push_back(entry);
- }
- for (uint64_t i = 0; i < count; ++i) {
- const char *path = note_data.GetCStr(&offset);
- if (path && path[0])
- m_nt_file_entries[i].path.SetCString(path);
- }
- } break;
- case NT_SIGINFO: {
- error = siginfo.Parse(note_data, arch);
- if (error.Fail())
- return error;
- thread_data->signo = siginfo.si_signo;
- } break;
- default:
- break;
+ switch (note.info.n_type) {
+ case LINUX::NT_PRSTATUS: {
+ have_prstatus = true;
+ ELFLinuxPrStatus prstatus;
+ Status status = prstatus.Parse(note.data, arch);
+ if (status.Fail())
+ return status.ToError();
+ thread_data.prstatus_sig = prstatus.pr_cursig;
+ thread_data.tid = prstatus.pr_pid;
+ uint32_t header_size = ELFLinuxPrStatus::GetSize(arch);
+ size_t len = note.data.GetByteSize() - header_size;
+ thread_data.gpregset = DataExtractor(note.data, header_size, len);
+ break;
+ }
+ case LINUX::NT_PRPSINFO: {
+ have_prpsinfo = true;
+ ELFLinuxPrPsInfo prpsinfo;
+ Status status = prpsinfo.Parse(note.data, arch);
+ if (status.Fail())
+ return status.ToError();
+ thread_data.name = prpsinfo.pr_fname;
+ SetID(prpsinfo.pr_pid);
+ break;
+ }
+ case LINUX::NT_SIGINFO: {
+ ELFLinuxSigInfo siginfo;
+ Status status = siginfo.Parse(note.data, arch);
+ if (status.Fail())
+ return status.ToError();
+ thread_data.signo = siginfo.si_signo;
+ break;
+ }
+ case LINUX::NT_FILE: {
+ m_nt_file_entries.clear();
+ lldb::offset_t offset = 0;
+ const uint64_t count = note.data.GetAddress(&offset);
+ note.data.GetAddress(&offset); // Skip page size
+ for (uint64_t i = 0; i < count; ++i) {
+ NT_FILE_Entry entry;
+ entry.start = note.data.GetAddress(&offset);
+ entry.end = note.data.GetAddress(&offset);
+ entry.file_ofs = note.data.GetAddress(&offset);
+ m_nt_file_entries.push_back(entry);
}
- } else if (note.n_name == "LINUX") {
- switch (note.n_type) {
- case NT_PRXFPREG:
- thread_data->fpregset = note_data;
+ for (uint64_t i = 0; i < count; ++i) {
+ const char *path = note.data.GetCStr(&offset);
+ if (path && path[0])
+ m_nt_file_entries[i].path.SetCString(path);
}
+ break;
+ }
+ case LINUX::NT_AUXV:
+ m_auxv = note.data;
+ break;
+ default:
+ thread_data.notes.push_back(note);
+ break;
}
-
- offset += note_size;
}
// Add last entry in the note section
- if (thread_data && thread_data->gpregset.GetByteSize() > 0) {
- m_thread_data.push_back(*thread_data);
- }
+ if (have_prstatus)
+ m_thread_data.push_back(thread_data);
+ return llvm::Error::success();
+}
- return error;
+/// Parse Thread context from PT_NOTE segment and store it in the thread list
+/// A note segment consists of one or more NOTE entries, but their types and
+/// meaning differ depending on the OS.
+llvm::Error ProcessElfCore::ParseThreadContextsFromNoteSegment(
+ const elf::ELFProgramHeader *segment_header, DataExtractor segment_data) {
+ assert(segment_header && segment_header->p_type == llvm::ELF::PT_NOTE);
+
+ auto notes_or_error = parseSegment(segment_data);
+ if(!notes_or_error)
+ return notes_or_error.takeError();
+ switch (GetArchitecture().GetTriple().getOS()) {
+ case llvm::Triple::FreeBSD:
+ return parseFreeBSDNotes(*notes_or_error);
+ case llvm::Triple::Linux:
+ return parseLinuxNotes(*notes_or_error);
+ case llvm::Triple::NetBSD:
+ return parseNetBSDNotes(*notes_or_error);
+ case llvm::Triple::OpenBSD:
+ return parseOpenBSDNotes(*notes_or_error);
+ default:
+ return llvm::make_error<llvm::StringError>(
+ "Don't know how to parse core file. Unsupported OS.",
+ llvm::inconvertibleErrorCode());
+ }
}
uint32_t ProcessElfCore::GetNumThreadContexts() {
@@ -724,15 +743,18 @@ uint32_t ProcessElfCore::GetNumThreadContexts() {
}
ArchSpec ProcessElfCore::GetArchitecture() {
- ObjectFileELF *core_file =
- (ObjectFileELF *)(m_core_module_sp->GetObjectFile());
ArchSpec arch;
- core_file->GetArchitecture(arch);
+ m_core_module_sp->GetObjectFile()->GetArchitecture(arch);
ArchSpec target_arch = GetTarget().GetArchitecture();
-
- if (target_arch.IsMIPS())
+ arch.MergeFrom(target_arch);
+
+ // On MIPS there is no way to differentiate betwenn 32bit and 64bit core files
+ // and this information can't be merged in from the target arch so we fail
+ // back to unconditionally returning the target arch in this config.
+ if (target_arch.IsMIPS()) {
return target_arch;
+ }
return arch;
}
generated by cgit v1.3 (git 2.53.0) at 2026-04-07 14:32:39 +0000