Re: [PATCH, gdbserver] Further cleanup of FDPIC/DSBT divergences

[Yao Qi <yao@codesourcery.com>]

On 08/10/2013 01:20 AM, Luis Machado wrote:
> +/* Scan for DYNTAG in .dynamic section of ABFD.  If DYNTAG is found 1
> +   is returned and the corresponding PTR is set.  We only search in
> +   the BFD, not in the target's memory.  */
> +
> +static int
> +scan_dyntag_in_bfd (int dyntag, bfd *abfd, CORE_ADDR *ptr)

Luis,
We've already have a function scan_dyntag in solib-dsbt.c which reads
in both BFD and the target memory.  There are some duplications in
scan_dyntag and scan_dyntag_in_bfd.  We can combine them into one
function, probably.


> +/* Given a shared library filename, load it up and find
> +   out what is its dsbt index.  */
> +
> +static int
> +fetch_solib_dsbt_index (const char *filename)
> +{
> +  unsigned long dsbt_index;
> +  CORE_ADDR addr;
> +  bfd *solib_bfd = NULL;
> +  volatile struct gdb_exception ex;
> +
> +  if (filename == NULL)
> +    return -1;
> +
> +  /* Open the shared library.  */
> +  TRY_CATCH (ex, RETURN_MASK_ALL)
> +    {
> +      solib_bfd = solib_bfd_open ((char *) filename);
> +    }
> +  if (solib_bfd == NULL)
> +    {
> +      return -1;
> +    }

Unnecessary braces.

> +
> +  /* Fetch the DSBT_INDEX from the shared library file on disk.  */
> +  if (scan_dyntag_in_bfd (DT_TIC6X_DSBT_INDEX, solib_bfd, &addr) == 0)

I don't find the definition of DT_TIC6X_DSBT_INDEX.  In uclibc, I only
find DT_C6000_DSBT_INDEX.

> @@ -684,24 +795,50 @@ dsbt_current_sos (void)
>   					   sizeof lm_buf.l_addr.map,
>   					   byte_order);
>
> -      ret = target_read_memory (map_addr + 12, (gdb_byte *) &indexword,
> -				sizeof indexword);
> -      if (ret)
> +      /* Fetch the name.  */
> +      addr = extract_unsigned_integer (lm_buf.l_name,
> +				       sizeof (lm_buf.l_name),
> +				       byte_order);
> +      target_read_string (addr, &name_buf, SO_NAME_MAX_PATH_SIZE - 1,
> +			  &errcode);
> +
> +      if (errcode != 0)
>   	{
> -	  warning (_("dsbt_current_sos: Unable to read dsbt index."
> -		     "  Shared object chain may be incomplete."));
> -	  break;
> +	  warning (_("dsbt_current_sos: Can't read pathname for link "
> +		   "map entry: %s."), safe_strerror (errcode));
> +
> +	  /* Since we do not have a pathname, just assume that
> +	     dsbt_index equals a dummy value of 1.  This way we can
                                                ^^ -1?

-- 
Yao (齐尧)