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Commit 81f7f456 authored by Robin Getz's avatar Robin Getz Committed by Mike Frysinger
Browse files

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: default avatarRobin Getz <robin.getz@analog.com>
Signed-off-by: default avatarMike Frysinger <vapier@gentoo.org>
parent 0a990614

arch/blackfin/kernel/traps.c

+10 −0
Original line number Diff line number Diff line
@@ -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