NetBSD

History

thorpej 240ebfc364 * Move The Alpha R(RELATIVE) handling into an Alpha-specific code block, thus isolating the "iffy hueristic" from the rest of the relocation code. * In the "iffy hueristic", use _GOT_END_, not _DYNAMIC. * Include the addend in Alpha R(RELATIVE) relocations.		2001-12-16 08:23:25 +00:00
..
arch	Don't put compiler options into CPPFLAGS.	2001-12-14 22:21:45 +00:00
Makefile	Don't put compiler options into CPPFLAGS.	2001-12-14 22:21:45 +00:00
README	Garbage-collect the OLD_GOT stuff.	2001-12-14 21:25:22 +00:00
debug.c	KNF	1999-03-01 16:40:07 +00:00
debug.h	KNF	1999-03-01 16:40:07 +00:00
headers.c	Sync with <sys/exec_elf.h> rev. 1.45: ElfNN_RelA -> ElfNN_Rela.	2001-04-25 12:24:50 +00:00
ld.elf_so.1	Allow both space and colon as a separator in LD_PRELOAD. Document this and	2001-11-02 15:28:36 +00:00
load.c	Allow both space and colon as a separator in LD_PRELOAD. Document this and	2001-11-02 15:28:36 +00:00
malloc.c	MAP_COPY -> MAP_PRIVATE	1999-06-17 21:09:47 +00:00
map_object.c	Return an error when there are too many segments rather than abort()ing.	2000-11-26 05:22:15 +00:00
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
reloc.c	* Move The Alpha R(RELATIVE) handling into an Alpha-specific code block,	2001-12-16 08:23:25 +00:00
rtld.c	Garbage-collect the OLD_GOT stuff.	2001-12-14 21:25:22 +00:00
rtld.h	Add code to peek into the PLT and determine which PLT entry format	2001-12-14 00:53:06 +00:00
rtldenv.h	KNF	1999-03-01 16:40:07 +00:00
search.c	Adjust a comment after the Great Renaming.	2000-07-27 10:44:39 +00:00
symbol.c	Fix how underfined weak symbols are treated -- before, ld.so would do nothing	2001-10-14 23:13:21 +00:00
sysident.h	Don't use multi-line string literals.	2001-06-19 12:07:21 +00:00
xmalloc.c	KNF	1999-03-01 16:40:07 +00:00
xprintf.c	Pointers are NULL. Characters are '\0'.	2001-08-14 20:13:56 +00:00

README

$NetBSD: README,v 1.7 2001/12/14 21:25:22 thorpej 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.

* 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