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authorMatt Klein <mklein@twitter.com>2013-01-02 13:20:49 -0800
committerJason Wessel <jason.wessel@windriver.com>2013-03-02 08:52:17 -0600
commit00370b8f8dd6e3171b8202f9c5187a5f73e99497 (patch)
tree5d15f25177a0e4f92e664b27658a48dfeadbbab7 /kernel/debug
parent5f784f798c1a6367d314b3ea5d742a5dcc8dc7ca (diff)
downloadlwn-00370b8f8dd6e3171b8202f9c5187a5f73e99497.tar.gz
lwn-00370b8f8dd6e3171b8202f9c5187a5f73e99497.zip
kdb: Setup basic kdb state before invoking commands via kgdb
Although invasive kdb commands are not supported via kgdb, some useful non-invasive commands like bt* require basic kdb state to be setup before calling into the kdb code. Factor out some of this code and call it before and after executing kdb commands via kgdb. Signed-off-by: Matt Klein <mklein@twitter.com> Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
Diffstat (limited to 'kernel/debug')
-rw-r--r--kernel/debug/debug_core.h2
-rw-r--r--kernel/debug/gdbstub.c3
-rw-r--r--kernel/debug/kdb/kdb_debugger.c24
3 files changed, 23 insertions, 6 deletions
diff --git a/kernel/debug/debug_core.h b/kernel/debug/debug_core.h
index 3494c28a7e7a..2235967e78b0 100644
--- a/kernel/debug/debug_core.h
+++ b/kernel/debug/debug_core.h
@@ -72,6 +72,8 @@ extern int dbg_kdb_mode;
#ifdef CONFIG_KGDB_KDB
extern int kdb_stub(struct kgdb_state *ks);
extern int kdb_parse(const char *cmdstr);
+extern int kdb_common_init_state(struct kgdb_state *ks);
+extern int kdb_common_deinit_state(void);
#else /* ! CONFIG_KGDB_KDB */
static inline int kdb_stub(struct kgdb_state *ks)
{
diff --git a/kernel/debug/gdbstub.c b/kernel/debug/gdbstub.c
index ce615e064482..ea5e3edb6915 100644
--- a/kernel/debug/gdbstub.c
+++ b/kernel/debug/gdbstub.c
@@ -782,7 +782,10 @@ static void gdb_cmd_query(struct kgdb_state *ks)
len = len / 2;
remcom_out_buffer[len++] = 0;
+ kdb_common_init_state(ks);
kdb_parse(remcom_out_buffer);
+ kdb_common_deinit_state();
+
strcpy(remcom_out_buffer, "OK");
}
break;
diff --git a/kernel/debug/kdb/kdb_debugger.c b/kernel/debug/kdb/kdb_debugger.c
index be7b33b73d30..d04a6ce2d3b7 100644
--- a/kernel/debug/kdb/kdb_debugger.c
+++ b/kernel/debug/kdb/kdb_debugger.c
@@ -34,6 +34,22 @@ EXPORT_SYMBOL_GPL(kdb_poll_idx);
static struct kgdb_state *kdb_ks;
+int kdb_common_init_state(struct kgdb_state *ks)
+{
+ kdb_initial_cpu = atomic_read(&kgdb_active);
+ kdb_current_task = kgdb_info[ks->cpu].task;
+ kdb_current_regs = kgdb_info[ks->cpu].debuggerinfo;
+ return 0;
+}
+
+int kdb_common_deinit_state(void)
+{
+ kdb_initial_cpu = -1;
+ kdb_current_task = NULL;
+ kdb_current_regs = NULL;
+ return 0;
+}
+
int kdb_stub(struct kgdb_state *ks)
{
int error = 0;
@@ -94,9 +110,7 @@ int kdb_stub(struct kgdb_state *ks)
}
/* Set initial kdb state variables */
KDB_STATE_CLEAR(KGDB_TRANS);
- kdb_initial_cpu = atomic_read(&kgdb_active);
- kdb_current_task = kgdb_info[ks->cpu].task;
- kdb_current_regs = kgdb_info[ks->cpu].debuggerinfo;
+ kdb_common_init_state(ks);
/* Remove any breakpoints as needed by kdb and clear single step */
kdb_bp_remove();
KDB_STATE_CLEAR(DOING_SS);
@@ -125,9 +139,7 @@ int kdb_stub(struct kgdb_state *ks)
* Upon exit from the kdb main loop setup break points and restart
* the system based on the requested continue state
*/
- kdb_initial_cpu = -1;
- kdb_current_task = NULL;
- kdb_current_regs = NULL;
+ kdb_common_deinit_state();
KDB_STATE_CLEAR(PAGER);
kdbnearsym_cleanup();
if (error == KDB_CMD_KGDB) {