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Add support for the LD_BIND_NOW environment variable. If it is set to a

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nonempty string, then function calls are relocated at program start-up
rather than lazily.  This variable is standard on Sun and SVR4 systems.

The dlopen() function now supports both lazy and immediate binding, as
determined by its "mode" argument, which can be either 1 (RTLD_LAZY) or
2 (RTLD_NOW).  I will add defines of these symbols to <dlfcn.h> as soon
as I've done a little more checking to make sure they won't cause
collisions or bootstrapping problems that would break "make world".
This commit is contained in:
John Polstra 1997-01-12 00:09:11 +00:00
parent 0604e65367
commit d3c677c7e0
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=21574
4 changed files with 42 additions and 4 deletions
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20
gnu/usr.bin/ld/i386/md.c
View File

@ -27,10 +27,11 @@
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $Id: md.c,v 1.12 1995/03/04 17:46:20 nate Exp $
* $Id: md.c,v 1.13 1996/10/01 01:27:56 peter Exp $
*/
#include <sys/param.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
@ -171,6 +172,23 @@ u_long addr;
sp->reloc_index = 0;
}
/*
* Bind a jmpslot to its target address. TARGET is where the jmpslot
* should jump to, and WHERE is a pointer to the jmpslot's address field.
* This is called by the dynamic linker when LD_BIND_NOW is set in the
* environment.
*/
void
md_bind_jmpslot(target, where)
u_long target;
caddr_t where;
{
jmpslot_t *sp =
(jmpslot_t *) (where - offsetof(jmpslot_t, addr[0]));
md_fix_jmpslot(sp, (long) sp, target);
}
/*
* Update the relocation record for a RRS jmpslot.
*/

3
gnu/usr.bin/ld/i386/md.h
View File

@ -27,7 +27,7 @@
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $Id: md.h,v 1.12 1995/03/04 17:46:21 nate Exp $
* $Id: md.h,v 1.13 1996/10/01 01:27:58 peter Exp $
*/
#ifndef __MD_H__
@ -232,6 +232,7 @@ long md_get_addend __P((struct relocation_info *, unsigned char *));
void md_relocate __P((struct relocation_info *, long, unsigned char *, int));
void md_make_jmpslot __P((jmpslot_t *, long, long));
void md_fix_jmpslot __P((jmpslot_t *, long, u_long));
void md_bind_jmpslot __P((u_long, caddr_t));
int md_make_reloc __P((struct relocation_info *, struct relocation_info *, int));
void md_make_jmpreloc __P((struct relocation_info *, struct relocation_info *, int));
void md_make_gotreloc __P((struct relocation_info *, struct relocation_info *, int));

20
libexec/rtld-aout/i386/md.c
View File

@ -27,10 +27,11 @@
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $Id: md.c,v 1.12 1995/03/04 17:46:20 nate Exp $
* $Id: md.c,v 1.13 1996/10/01 01:27:56 peter Exp $
*/
#include <sys/param.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
@ -171,6 +172,23 @@ u_long addr;
sp->reloc_index = 0;
}
/*
* Bind a jmpslot to its target address. TARGET is where the jmpslot
* should jump to, and WHERE is a pointer to the jmpslot's address field.
* This is called by the dynamic linker when LD_BIND_NOW is set in the
* environment.
*/
void
md_bind_jmpslot(target, where)
u_long target;
caddr_t where;
{
jmpslot_t *sp =
(jmpslot_t *) (where - offsetof(jmpslot_t, addr[0]));
md_fix_jmpslot(sp, (long) sp, target);
}
/*
* Update the relocation record for a RRS jmpslot.
*/

3
libexec/rtld-aout/i386/md.h
View File

@ -27,7 +27,7 @@
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $Id: md.h,v 1.12 1995/03/04 17:46:21 nate Exp $
* $Id: md.h,v 1.13 1996/10/01 01:27:58 peter Exp $
*/
#ifndef __MD_H__
@ -232,6 +232,7 @@ long md_get_addend __P((struct relocation_info *, unsigned char *));
void md_relocate __P((struct relocation_info *, long, unsigned char *, int));
void md_make_jmpslot __P((jmpslot_t *, long, long));
void md_fix_jmpslot __P((jmpslot_t *, long, u_long));
void md_bind_jmpslot __P((u_long, caddr_t));
int md_make_reloc __P((struct relocation_info *, struct relocation_info *, int));
void md_make_jmpreloc __P((struct relocation_info *, struct relocation_info *, int));
void md_make_gotreloc __P((struct relocation_info *, struct relocation_info *, int));