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binutils 2.20.1 on irix 6.5.22 _rld_new_interface question

David E. Cross crossd@cs.rpi.edu
Fri Nov 5 17:39:00 GMT 2010 
Running binutils 2.20.1 on irix 6.5.22 with great success, moreso then 
native Irix ld in fact.

However I have come across one bug that I am scratching my head over how 
to fix.

Irix has no "dladdr" funtion, instead they tell you to call 
_rld_new_interface with certain parameters and it will do the same things. 
The problem is that _rld_new_interface is a special symbol that is within 
the runtime linker and not in any library.

There is some special handling in bfd/elfxx-mips.c for this already, that 
ammounts to basically ignoring the symble.  This works fine for the 99% of 
applications that don't acually use the symbol (and allows things to link 
with libc).. However for programs that DO use it, a  undef symbol needs to 
be inserted into the symbol table as a placeholder.  Like _I THINK_
is done with __rld_obj_head.  I have tried duplicating the part of the 
code that adds __rld_obj_head without success; (modifiying it to set 
BSF_FUNCTION and ST_FUNC).. I am obviously just stabbing in the dark here 
and I hope someone could help me out.. I have some symbol tables listed 
below:

Symbols from /lib32/libc.so.1:

[Index]   Value      Size    Type  Bind  Other     Shndx   Name

[6243]  |         0|       0|FUNC |GLOB |DEFAULT  |UNDEF  |_rld_new_interface


dso_dlfcn  (when linked with Irix ld)

[46]    | 268438512|       0|FUNC |GLOB |DEFAULT  |UNDEF  |_rld_new_interface

dso_dlfcn.o (when compiled with Irix cc)

[6]     |         0|       0|FUNC |GLOB |DEFAULT  |UNDEF  |_rld_new_interface


dso_dlfcn.o (when compiled with gcc)

[11]    |         0|       0|OBJT |GLOB |DEFAULT  |UNDEF  |_rld_new_interface


The 'OBJT' type is slightly disturbing, but it matches other functions, so 
I won't worry too much there. :)

Ideas, suggestions?

-- 
David E. Cross
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