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From: Jason Wessel on 5 Aug 2010 10:50
When an arch such as mips and microblaze does not implement either HW
or software single stepping the debug core should re-enter kdb. The
kdb code will properly ignore the single step operation. Attempting
to single step the kernel without software or hardware support causes
unpredictable kernel crashes.

Signed-off-by: Jason Wessel <jason.wessel(a)windriver.com>
---
kernel/debug/debug_core.c | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/kernel/debug/debug_core.c b/kernel/debug/debug_core.c
index 8bc5eef..9ed9307 100644
--- a/kernel/debug/debug_core.c
+++ b/kernel/debug/debug_core.c
@@ -605,6 +605,8 @@ cpu_master_loop:
if (dbg_kdb_mode) {
kgdb_connected = 1;
error = kdb_stub(ks);
+ if (error == -1)
+ continue;
kgdb_connected = 0;
} else {
error = gdb_serial_stub(ks);
--
1.6.3.3

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Prev: [PATCH 02/17] gdbstub: Optimize kgdb's "thread:" response for the gdb serial protocol
Next: [PATCH 09/17] arm,kgdb: Add ability to trap into debugger on notify_die