Reconnect db_elf.c to the build (now under "options DDB_NOKLDSYM"). It

doesn't actually build yet.

sys/conf/NOTES

@@ -185,6 +185,14 @@ options 	SYSVMSG
 #
 options 	DDB
 
+#
+# Use direct symbol lookup routines for ddb instead of the kernel linker
+# ones, so that symbols (mostly) work before the kernel linker has been
+# initialized.  This is not the default because it breaks ddb's lookup of
+# symbols in loaded modules.
+#
+#!options 	DDB_NOKLDSYM
+
 #
 # Don't drop into DDB for a panic. Intended for unattended operation
 # where you may want to drop to DDB from the console, but still want

sys/conf/files

@@ -177,6 +177,7 @@ crypto/sha2/sha2.c	optional ipsec
 ddb/db_access.c		optional ddb
 ddb/db_break.c		optional ddb
 ddb/db_command.c	optional ddb
+ddb/db_elf.c		optional ddb
 ddb/db_examine.c	optional ddb
 ddb/db_expr.c		optional ddb
 ddb/db_input.c		optional ddb

sys/conf/options

@@ -62,6 +62,7 @@ COMPAT_SUNOS	opt_compat.h
 COMPILING_LINT	opt_global.h
 CY_PCI_FASTINTR
 DDB
+DDB_NOKLDSYM	opt_ddb.h
 DDB_UNATTENDED	opt_ddb.h
 GDB_REMOTE_CHAT	opt_ddb.h
 NODEVFS		opt_devfs.h

sys/ddb/db_elf.c

@@ -38,10 +38,12 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 
-#if defined(__ELF__) && defined(__alpha__)
+#ifdef __ELF__
 
 #include "opt_ddb.h"
 
+#ifdef DDB_NOKLDSYM
+
 #include <sys/types.h>
 #include <sys/param.h>
 #include <sys/systm.h>  
@@ -378,4 +380,6 @@ kdb_init(void)
 		X_db_sym_init(ksym_start, ksym_end, "kernel");
 }
 
-#endif
+#endif /* DDB_NOKLDSYM */
+
+#endif /* __ELF__ */

sys/ddb/db_kld.c

@@ -35,6 +35,10 @@
  * Symbol table routines for kld maintained kernels.
  */
 
+#include "opt_ddb.h"
+
+#ifndef DDB_NOKLDSYM
+
 #include <sys/param.h>
 #include <sys/systm.h>
 #include <sys/linker.h>
@@ -124,3 +128,5 @@ kdb_init()
 {
 	db_add_symbol_table(0, 0, "kernel", 0);
 }
+
+#endif /* !DDB_NOKLDSYM */