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elf-core: Document offset constants in FreeBSD prstatus parser 

Also accomodate struct padding based on arch, for later i386 work.

llvm-svn: 187040
This commit is contained in:
Ed Maste 2013-07-24 14:23:37 +00:00
parent 4d76a21bc7
commit 197af31aba
1 changed files with 20 additions and 6 deletions
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26
lldb/source/Plugins/Process/elf-core/ProcessElfCore.cpp
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@ -435,17 +435,31 @@ struct ELFNote
}
};
// Parse a FreeBSD NT_PRSTATUS note - see FreeBSD sys/procfs.h for details.
static void
ParseFreeBSDPrStatus(ThreadData *thread_data, DataExtractor &data,
ArchSpec &arch)
{
lldb::offset_t offset;
size_t len;
lldb::offset_t offset = 0;
bool have_padding = (arch.GetMachine() == llvm::Triple::x86_64);
int pr_version = data.GetU32(&offset);
offset = 36;
thread_data->signo = data.GetU32(&offset);
offset = 48;
len = data.GetByteSize() - offset;
Log *log (ProcessPOSIXLog::GetLogIfAllCategoriesSet (POSIX_LOG_PROCESS));
if (log)
{
if (pr_version > 1)
log->Printf("FreeBSD PRSTATUS unexpected version %d", pr_version);
}
if (have_padding)
offset += 4;
offset += 28; // pr_statussz, pr_gregsetsz, pr_fpregsetsz, pr_osreldate
thread_data->signo = data.GetU32(&offset); // pr_cursig
offset += 4; // pr_pid
if (have_padding)
offset += 4;
size_t len = data.GetByteSize() - offset;
thread_data->gpregset = DataExtractor(data, offset, len);
}