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xtensa: add irq flags trace support

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Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Chris Zankel <chris@zankel.net>
This commit is contained in:
Max Filippov 2013-03-31 06:32:42 +04:00 committed by Chris Zankel
parent 3ae908c99e
commit c92931b200
2 changed files with 35 additions and 0 deletions
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3
arch/xtensa/Kconfig
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@ -55,6 +55,9 @@ source "kernel/Kconfig.freezer"
config STACKTRACE_SUPPORT
def_bool y
config TRACE_IRQFLAGS_SUPPORT
def_bool y
config MMU
def_bool n

32
arch/xtensa/kernel/entry.S
View File

@ -389,6 +389,22 @@ common_exception:
save_xtregs_opt a1 a2 a4 a5 a6 a7 PT_XTREGS_OPT
#ifdef CONFIG_TRACE_IRQFLAGS
l32i a4, a1, PT_DEPC
/* Double exception means we came here with an exception
* while PS.EXCM was set, i.e. interrupts disabled.
*/
bgeui a4, VALID_DOUBLE_EXCEPTION_ADDRESS, 1f
l32i a4, a1, PT_EXCCAUSE
bnei a4, EXCCAUSE_LEVEL1_INTERRUPT, 1f
/* We came here with an interrupt means interrupts were enabled
* and we've just disabled them.
*/
movi a4, trace_hardirqs_off
callx4 a4
1:
#endif
/* Go to second-level dispatcher. Set up parameters to pass to the
* exception handler and call the exception handler.
*/
@ -407,6 +423,22 @@ common_exception:
.global common_exception_return
common_exception_return:
#ifdef CONFIG_TRACE_IRQFLAGS
l32i a4, a1, PT_DEPC
/* Double exception means we came here with an exception
* while PS.EXCM was set, i.e. interrupts disabled.
*/
bgeui a4, VALID_DOUBLE_EXCEPTION_ADDRESS, 1f
l32i a4, a1, PT_EXCCAUSE
bnei a4, EXCCAUSE_LEVEL1_INTERRUPT, 1f
/* We came here with an interrupt means interrupts were enabled
* and we'll reenable them on return.
*/
movi a4, trace_hardirqs_on
callx4 a4
1:
#endif
/* Jump if we are returning from kernel exceptions. */
1: l32i a3, a1, PT_PS