[lldb-dev] Target::ReadMemory query

Matthew Gardiner mg11 at csr.com
Tue Jun 10 00:14:04 PDT 2014

Greg Clayton wrote:

> Your embedded target should be using "<arch>-unknown-unknown" for a triple. This will cause your target at runtime to use the DynamicLoaderStatic plug-in which will set the "load" address for all of your binary images to match the "file" address in the file and should give you the result you are looking for.

Hi Greg,

The DynamicLoader fails to load my sections because GetEntryPoint 
returns invalid address:

     if (m_entry_point != LLDB_INVALID_ADDRESS)
         return m_entry_point;

     if (m_auxv.get() == NULL)
         return LLDB_INVALID_ADDRESS;

     AuxVector::iterator I = m_auxv->FindEntry(AuxVector::AT_ENTRY);

     if (I == m_auxv->end())
==>     return LLDB_INVALID_ADDRESS;

Is one of my problems, the fact that DynamicLoaderPOSIXDYLD is being 
used not DynamicLoaderStatic? (Of course my simple embedded target has 
no OS, processes, or loaders. However, I do have an ELF file, which I 
load prior to gdb-remote using "target create <elf-file>").

Incidentally the first part of my GDB-RSP is:

-> +
-> QStartNoAckMode
<- +
<- OK
-> +
-> QThreadSuffixSupported
-> QListThreadsInStopReply
-> qHostInfo
<- pid:1;endian:little;triple:kalimba-unknown-unknown;ptrsize:4;
-> vCont?
<- vCont;c;t
-> qVAttachOrWaitSupported
-> qProcessInfo
<- pid:1;endian:little;triple:kalimba-unknown-unknown;ptrsize:4;
-> ?
<- S05

(I get the DynamicLoaderPOSIXDYLD used, regardless of whether my triple 
string is kalimba-unknown-unknown or i386-unknown-unknown. kalimba is 
our chip's name).

I'll spend the rest of my day trying to figure out why 
DynamicLoaderStatic is not being used.


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