NetBSD

History

mycroft 7ff3aa31e8 Reorganize PowerPC cold a little. The return value from _rtld_bind_pltgot() was ambiguous in the case of a weak symbol that was not defined. This caused RTLD_NOW to fail badly with shared libraries linked against the new crtbegin.o.		2001-09-10 06:09:41 +00:00
..
arch	Reorganize PowerPC cold a little. The return value from _rtld_bind_pltgot()	2001-09-10 06:09:41 +00:00
debug.c
debug.h
headers.c
load.c	s/warn/xwarnx/ cuts down size by 50% by not pulling in stdio.	2001-05-27 23:26:47 +00:00
Makefile	Enable arm if OBJECT_FMT is ELF. Initialize first few GOT entries for ARM.	2001-07-15 03:09:22 +00:00
malloc.c
map_object.c
paths.c	Don't include <uvm/uvm_param.h>. It does not appear to be needed by anything.	2001-05-24 17:41:42 +00:00
README
reloc.c	Reorganize PowerPC cold a little. The return value from _rtld_bind_pltgot()	2001-09-10 06:09:41 +00:00
rtld.c	Unloading objects, can cause other objects whose reference count becomes	2001-05-10 20:19:25 +00:00
rtld.h
rtldenv.h
search.c
symbol.c
sysident.h	Don't use multi-line string literals.	2001-06-19 12:07:21 +00:00
xmalloc.c
xprintf.c	Pointers are NULL. Characters are '\0'.	2001-08-14 20:13:56 +00:00

README

$NetBSD: README,v 1.6 1999/08/20 21:12:47 christos Exp $

BUGS/PROBLEMS:

* rtld.c around line 184:

	#iffdef __alpha__
	/* XXX XXX XXX */
	_rtld_objself.pltgot = NULL;
	#endif

  It's a workaround for a linker bug, and will go away when the linker is
  fixed.

* Formerly, _DYNAMIC was _GLOBAL_OFFSET_TABLE_[0], but that isn't true with
  newer snapshots of gas/binutils (at least on the Alpha), which support
  multiple GOTs.  That's what the OLD_GOT #ifdefs are about.
  
* The method used to relocate ld.so is shoddy and fragile.  Currently it's
  something like:

  alpha, powerpc:
	(1) assembly code relocates RELATIVE relocations in the GOT
	    (on some ports, all relative relocations; this will probably
	    have to be #ifdef'd in reloc.c), assuming that everything
	    in the GOT is a RELATIVE relocation.

	(2) C code relocates the rest of the loader, excluding those
	    RELATIVE relocations already done (via an ... iffy heuristic).

  i386, m68k, sparc:
	(1) C code relocates RELATIVE relocations in _rtld_init() carefully
	    so that it does not touch any globals.

	(2) C code relocates the rest of the loader, excluding those
	    RELATIVE relocations already done (via an ... iffy heuristic).

  mips:
	(1) loads ld.elf_so at 0, so no relocating is necessary.

  Something better (like that the glibc ELF ld.so does) should be done
  eventually, where a single set of C code is compiled twice, once for
  normal use, and once to be used to relocate the shared linker.  No
  relocations should be processed in assembly language.

* On the Alpha, this code Really needs to be checked to be sure that
  it doesn't make calls that could use FP, while doing lazy binding.

TO DO:

* Support for other platforms

* Support for coexistance of 32-bit and 64-bit ELF on platforms that can
  do that.

* Possible support for ldd (standalone operation) and program loading
  a la the glibc shared loader.

* Support for relocating ld.elf_so on mips