First attempt at FreeBSD & Linux ELF support.

Compile and link a new kernel, that will give native ELF support, and
provide the hooks for other ELF interpreters as well.

To make native ELF binaries use John Polstras elf-kit-1.0.1..
For the time being also use his ld-elf.so.1 and put it in
/usr/libexec.

The Linux emulator has been enhanced to also run ELF binaries, it
is however in its very first incarnation.
Just get some Linux ELF libs (Slackware-3.0) and put them in the
prober place (/compat/linux/...).
I've ben able to run all the Slackware-3.0 binaries I've tried
so far.
(No it won't run quake yet :)

2 files changed, 15 insertions, 3 deletions

diff --git a/lkm/linux/Makefile b/lkm/linux/Makefile
index 7c7074c..e544b7f 100644
--- a/lkm/linux/Makefile
+++ b/lkm/linux/Makefile
@@ -1,4 +1,4 @@
-#	$Id: Makefile,v 1.5 1996/01/27 23:57:06 rgrimes Exp $
+#	$Id: Makefile,v 1.6 1996/03/02 20:00:35 peter Exp $
 
 .PATH:	${.CURDIR}/../../sys/i386/linux
 KMOD=	linux_mod
@@ -11,7 +11,7 @@ NOMAN=
 
 CFLAGS+= -DLKM -I. -DCOMPAT_43 -DCOMPAT_LINUX #-DDEBUG
 CPPFLAGS= -I. -I${.CURDIR}/../../sys
-
+EXPORT_SYMS=_linux_mod
 CLEANFILES+= vnode_if.h vnode_if.c linux_genassym.o linux_genassym machine \
 	linux_assym.h
 
diff --git a/lkm/linux/linux.c b/lkm/linux/linux.c
index 67faa18..dbd319f 100644
--- a/lkm/linux/linux.c
+++ b/lkm/linux/linux.c
@@ -25,7 +25,7 @@
  * (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: linux.c,v 1.3 1995/11/13 07:18:38 bde Exp $
+ *	$Id: linux.c,v 1.4 1995/11/14 07:34:18 bde Exp $
  */
 
 #include <sys/param.h>
@@ -34,14 +34,24 @@
 #include <sys/conf.h>
 #include <sys/sysent.h>
 #include <sys/lkm.h>
+#include <sys/imgact_elf.h>
+#include "i386/linux/linux.h"
 
 extern const struct execsw linux_execsw;
 
 MOD_EXEC(linux, -1, (struct execsw*)&linux_execsw);
 
+static Elf32_Interp_info linux_interp = {
+						&elf_linux_sysvec,
+						"/lib/ld-linux.so.1",
+						"/compat/linux"
+					};
+
 static int
 linux_load(struct lkm_table *lkmtp, int cmd)
 {
+	if (elf_insert_interp(&linux_interp))
+		uprintf("Could not install ELF interpreter entry\n");
 	uprintf("Linux emulator installed\n");
 	return 0;
 }
@@ -49,6 +59,8 @@ linux_load(struct lkm_table *lkmtp, int cmd)
 static int
 linux_unload(struct lkm_table *lkmtp, int cmd)
 {
+	if (elf_remove_interp(&linux_interp))
+		uprintf("Could not deinstall ELF interpreter entry\n");
 	uprintf("Linux emulator removed\n");
 	return 0;
 }