path: root/arch/arm/kernel/kgdb.c
diff options
authorJason Wessel <>2010-05-20 21:04:21 -0500
committerJason Wessel <>2010-05-20 21:04:21 -0500
commitdcc7871128e99458ca86186b7bc8bf27ff0c47b5 (patch)
treee10d252ccc4e990aac7dd09f44b94cfe045adc6b /arch/arm/kernel/kgdb.c
parent67fc4e0cb931d6b4ccf21248e4199b154478ecea (diff)
kgdb: core changes to support kdb
These are the minimum changes to the kgdb core in order to enable an API to connect a new front end (kdb) to the debug core. This patch introduces the dbg_kdb_mode variable controls where the user level I/O is routed. It will be routed to the gdbstub (kgdb) or to the kdb front end which is a simple shell available over the kgdboc connection. You can switch back and forth between kdb or the gdb stub mode of operation dynamically. From gdb stub mode you can blindly type "$3#33", or from the kdb mode you can enter "kgdb" to switch to the gdb stub. The logic in the debug core depends on kdb to look for the typical gdb connection sequences and return immediately with KGDB_PASS_EVENT if a gdb serial command sequence is detected. That should allow a reasonably seamless transition between kdb -> gdb without leaving the kernel exception state. The two gdb serial queries that kdb is responsible for detecting are the "?" and "qSupported" packets. CC: Ingo Molnar <> Signed-off-by: Jason Wessel <> Acked-by: Martin Hicks <>
Diffstat (limited to 'arch/arm/kernel/kgdb.c')
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/arm/kernel/kgdb.c b/arch/arm/kernel/kgdb.c
index a5b846b9895d..c868a8864117 100644
--- a/arch/arm/kernel/kgdb.c
+++ b/arch/arm/kernel/kgdb.c
@@ -98,6 +98,11 @@ sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *task)
gdb_regs[_CPSR] = thread_regs->ARM_cpsr;
+void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long pc)
+ regs->ARM_pc = pc;
static int compiled_break;
int kgdb_arch_handle_exception(int exception_vector, int signo,