Commit Graph

9 Commits

Author SHA1 Message Date
John Polstra
d3980376e8 Add a new function dllockinit() for registering thread locking
functions to be used by the dynamic linker.  This can be called by
threads packages at start-up time.  I will add the call to libc_r
soon.

Also add a default locking method that is used up until dllockinit()
is called.  The default method works by blocking SIGVTALRM, SIGPROF,
and SIGALRM in critical sections.  It is based on the observation
that most user-space threads packages implement thread preemption
with one of these signals (usually SIGVTALRM).

The dynamic linker has never been reentrant, but it became less
reentrant in revision 1.34 of "src/libexec/rtld-elf/rtld.c".
Starting with that revision, multiple threads each doing lazy
binding could interfere with each other.  The usual symptom was
that a symbol was falsely reported as undefined at start-up time.
It was rare but not unseen.  This commit fixes it.
1999-12-27 04:44:04 +00:00
Peter Wemm
7f3dea244c $Id$ -> $FreeBSD$ 1999-08-28 00:22:10 +00:00
John Polstra
18cd0551a7 Add a MAINTAINER line naming myself. We control the vertical. We
control the horizontal.
1999-07-09 16:27:43 +00:00
John Polstra
d5b537d01a Eliminate all machine-dependent code from the main source body and
the Makefile, and move it down into the architecture-specific
subdirectories.

Eliminate an asm() statement for the i386.

Make the dynamic linker work if it is built as an executable instead
of as a shared library.  See i386/Makefile.inc to find out how to
do it.  Note, this change is not enabled and it might never be
enabled.  But it might be useful in the future.  Building the
dynamic linker as an executable should make it start up faster,
because it won't have any relocations.  But in practice I suspect
the difference is negligible.
1999-04-09 00:28:43 +00:00
Nate Williams
0b8dcbe23c - Set the system immutable flag when installing ld.so to avoid people
accidentally clobbering it.

Submitted by:	numberous people on -current
1999-02-15 05:02:54 +00:00
Doug Rabson
13575fc46f Add alpha support.
Submitted by: John Birrell <jb@cimlogic.com.au> (with extra hacks by me)
Obtained from: Probably NetBSD
1998-09-04 19:03:57 +00:00
John Polstra
9d5aee94a0 Add "-C" to INSTALLFLAGS to install atomically. An elf->elf
installworld dies at this point otherwise, leaving the system
without a dynamic linker.
1998-08-17 04:59:15 +00:00
Doug Rabson
2001f720ce Add GDB support. The method and some of the code came from NetBSD's elf
runtime linker.
1998-04-30 07:48:02 +00:00
John Polstra
3124c3e093 Import the ELF dynamic linker. This is the ElfKit version with
quite a few enhancements and bug fixes.  There are still some known
deficiencies, but it should be adequate to get us started with ELF.

Submitted by:	John Polstra <jdp@polstra.com>
1998-03-07 19:24:35 +00:00