[PATCH, MIPS] Support shared library debug with MIPS PIE (glibc)

[Joseph Myers]

On Tue, 23 Jun 2015, Matthew Fortune wrote:

> -/* If there is a DT_MIPS_RLD_MAP entry in the dynamic section, fill it in
> -   with the run-time address of the r_debug structure  */
> +/* If there is a DT_MIPS_RLD_MAP2 or DT_MIPS_RLD_MAP entry in the dynamic
> +   section, fill in the debug map pointer with the run-time address of the
> +   r_debug structure.  */
>  #define ELF_MACHINE_DEBUG_SETUP(l,r) \
> -do { if ((l)->l_info[DT_MIPS (RLD_MAP)]) \
> +do { if ((l)->l_info[DT_MIPS (RLD_MAP2)]) \
> +       { \
> +	 char *ptr = (char *)(l)->l_info[DT_MIPS (RLD_MAP2)]; \
> +	 ptr += (l)->l_info[DT_MIPS (RLD_MAP2)]->d_un.d_val; \
> +	 *(ElfW(Addr) *)ptr = (ElfW(Addr)) (r); \
> +       } \
> +     else if ((l)->l_info[DT_MIPS (RLD_MAP)]) \

What if there are both DT_MIPS_RLD_MAP2 and DT_MIPS_RLD_MAP?  Will that 
never happen?

-- 
Joseph S. Myers
joseph@codesourcery.com