NetBSD

History

christos f8ad0818e5 Unloading objects, can cause other objects whose reference count becomes 0 to be unloaded. Make sure that when we unload those objects we remove any references to them from the globals list... This fixes SIGSEGV with apache+mod_php+mysql. XXX: This fix should be pulled up. christos		2001-05-10 20:19:25 +00:00
..
arch	Sync with <sys/exec_elf.h> rev. 1.45: ElfNN_RelA -> ElfNN_Rela.	2001-04-25 12:24:50 +00:00
Makefile	back out previous commit; I found a better way of handling the missing	2001-01-14 09:39:26 +00:00
README	reflect reality	1999-08-20 21:12:47 +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
load.c	Make ldd(1) build again.	2000-11-10 23:53:04 +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	Fix linked-list botch with sysctl-based library selection that meant	2000-11-10 18:19:06 +00:00
reloc.c	Sync with <sys/exec_elf.h> rev. 1.45: ElfNN_RelA -> ElfNN_Rela.	2001-04-25 12:24:50 +00:00
rtld.c	Unloading objects, can cause other objects whose reference count becomes	2001-05-10 20:19:25 +00:00
rtld.h	Sync with <sys/exec_elf.h> rev. 1.45: ElfNN_RelA -> ElfNN_Rela.	2001-04-25 12:24:50 +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	format warning fixes from he, after testing on 64-bit elf (alpha)	2000-10-11 20:46:07 +00:00
sysident.h	More cruft.	2000-12-15 06:49:19 +00:00
xmalloc.c	KNF	1999-03-01 16:40:07 +00:00
xprintf.c	Treat short and byte print formats as and cast to the right size.	2000-07-03 03:32:57 +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