/// 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).
void
ProcessElfCore::ParseThreadContextsFromNoteSegment(const elf::ELFProgramHeader *segment_header,
DataExtractor segment_data)
{
assert(segment_header && segment_header->p_type == llvm::ELF::PT_NOTE);
lldb::offset_t offset = 0;
ThreadData *thread_data = new ThreadData();
bool have_prstatus = false;
bool have_prpsinfo = false;
ArchSpec arch = GetArchitecture();
ELFLinuxPrPsInfo prpsinfo;
ELFLinuxPrStatus prstatus;
size_t header_size;
size_t len;
// Loop through the NOTE entires in the segment
while (offset < segment_header->p_filesz)
{
ELFNote note = ELFNote();
note.Parse(segment_data, &offset);
// 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);
// Add the new thread to thread list
m_thread_data.push_back(*thread_data);
thread_data = new ThreadData();
have_prstatus = false;
have_prpsinfo = false;
}
size_t note_start, note_size;
note_start = offset;
note_size = llvm::RoundUpToAlignment(note.n_descsz, 4);
// Store the NOTE information in the current thread
DataExtractor note_data (segment_data, note_start, note_size);
if (note.n_name == "FreeBSD")
{
switch (note.n_type)
{
case NT_FREEBSD_PRSTATUS:
have_prstatus = true;
ParseFreeBSDPrStatus(thread_data, note_data, arch);
break;
case NT_FREEBSD_FPREGSET:
thread_data->fpregset = note_data;
break;
case NT_FREEBSD_PRPSINFO:
have_prpsinfo = true;
break;
case NT_FREEBSD_THRMISC:
ParseFreeBSDThrMisc(thread_data, note_data);
break;
case NT_FREEBSD_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;
default:
break;
}
}
else
{
switch (note.n_type)
{
case NT_PRSTATUS:
have_prstatus = true;
prstatus.Parse(note_data, arch);
thread_data->signo = prstatus.pr_cursig;
header_size = ELFLinuxPrStatus::GetSize(arch);
len = note_data.GetByteSize() - header_size;
thread_data->gpregset = DataExtractor(note_data, header_size, len);
break;
case NT_FPREGSET:
thread_data->fpregset = note_data;
break;
case NT_PRPSINFO:
have_prpsinfo = true;
prpsinfo.Parse(note_data, arch);
thread_data->name = prpsinfo.pr_fname;
break;
case NT_AUXV:
m_auxv = DataExtractor(note_data);
break;
default:
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);
}
}
/// 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).
void
ProcessElfCore::ParseThreadContextsFromNoteSegment(const elf::ELFProgramHeader *segment_header,
DataExtractor segment_data)
{
assert(segment_header && segment_header->p_type == llvm::ELF::PT_NOTE);
lldb::offset_t offset = 0;
std::unique_ptr<ThreadData> thread_data(new ThreadData);
bool have_prstatus = false;
bool have_prpsinfo = false;
ArchSpec arch = GetArchitecture();
ELFLinuxPrPsInfo prpsinfo;
ELFLinuxPrStatus prstatus;
size_t header_size;
size_t len;
// Loop through the NOTE entires in the segment
while (offset < segment_header->p_filesz)
{
ELFNote note = ELFNote();
note.Parse(segment_data, &offset);
// 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);
// Add the new thread to thread list
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 == "CORE")
{
switch (note.n_type)
{
case NT_PRSTATUS:
have_prstatus = true;
prstatus.Parse(note_data, arch);
thread_data->signo = 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:
thread_data->fpregset = note_data;
break;
case NT_PRPSINFO:
have_prpsinfo = true;
prpsinfo.Parse(note_data, arch);
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;
default:
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);
}
}