kdb: core for kgdb back end (2 of 2)

This patch contains the hooks and instrumentation into kernel which
live outside the kernel/debug directory, which the kdb core
will call to run commands like lsmod, dmesg, bt etc...

CC: linux-arch@vger.kernel.org
Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
Signed-off-by: Martin Hicks <mort@sgi.com>

1 files changed, 21 insertions, 0 deletions

diff --git a/kernel/kallsyms.c b/kernel/kallsyms.c
index 13aff293f4de..6f6d091b5757 100644
--- a/kernel/kallsyms.c
+++ b/kernel/kallsyms.c
@@ -16,6 +16,7 @@
 #include <linux/init.h>
 #include <linux/seq_file.h>
 #include <linux/fs.h>
+#include <linux/kdb.h>
 #include <linux/err.h>
 #include <linux/proc_fs.h>
 #include <linux/sched.h>        /* for cond_resched */
@@ -516,6 +517,26 @@ static int kallsyms_open(struct inode *inode, struct file *file)
         return ret;
 }
 
+#ifdef  CONFIG_KGDB_KDB
+const char *kdb_walk_kallsyms(loff_t *pos)
+{
+        static struct kallsym_iter kdb_walk_kallsyms_iter;
+        if (*pos == 0) {
+                memset(&kdb_walk_kallsyms_iter, 0,
+                       sizeof(kdb_walk_kallsyms_iter));
+                reset_iter(&kdb_walk_kallsyms_iter, 0);
+        }
+        while (1) {
+                if (!update_iter(&kdb_walk_kallsyms_iter, *pos))
+                        return NULL;
+                ++*pos;
+                /* Some debugging symbols have no name.  Ignore them. */
+                if (kdb_walk_kallsyms_iter.name[0])
+                        return kdb_walk_kallsyms_iter.name;
+        }
+}
+#endif  /* CONFIG_KGDB_KDB */
+
 static const struct file_operations kallsyms_operations = {
         .open = kallsyms_open,
         .read = seq_read,