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authorRobin Getz <robin.getz@analog.com>2009-06-03 18:58:26 +0000
committerMike Frysinger <vapier@gentoo.org>2009-06-12 06:15:28 -0400
commit81f7f45606812f1d15d618c2646d0f33ca111f87 (patch)
tree5b105be6f9b8bcac9172690ffc62d02ad8199391 /arch/blackfin/kernel/traps.c
parent0a990614264f04879d9608da1cfcf9a6596efe08 (diff)
Blackfin: export the last exception cause via debugfs
We have some test code that runs in userspace that exercises the exception handling of the Blackfin pretty thoroughly. Part of the validation process is checking the exact exception triggered, so export the last one seen to userspace via debugfs when debugging is enabled for the test code to check. Signed-off-by: Robin Getz <robin.getz@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'arch/blackfin/kernel/traps.c')
-rw-r--r--arch/blackfin/kernel/traps.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/blackfin/kernel/traps.c b/arch/blackfin/kernel/traps.c
index 35f675f5ca16..63ccb283acdc 100644
--- a/arch/blackfin/kernel/traps.c
+++ b/arch/blackfin/kernel/traps.c
@@ -68,6 +68,13 @@
({ if (0) printk(fmt, ##arg); 0; })
#endif
+#if defined(CONFIG_DEBUG_MMRS) || defined(CONFIG_DEBUG_MMRS_MODULE)
+u32 last_seqstat;
+#ifdef CONFIG_DEBUG_MMRS_MODULE
+EXPORT_SYMBOL(last_seqstat);
+#endif
+#endif
+
/* Initiate the event table handler */
void __init trap_init(void)
{
@@ -245,6 +252,9 @@ asmlinkage void trap_c(struct pt_regs *fp)
unsigned long trapnr = fp->seqstat & SEQSTAT_EXCAUSE;
trace_buffer_save(j);
+#if defined(CONFIG_DEBUG_MMRS) || defined(CONFIG_DEBUG_MMRS_MODULE)
+ last_seqstat = (u32)fp->seqstat;
+#endif
/* Important - be very careful dereferncing pointers - will lead to
* double faults if the stack has become corrupt