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| author | Max Filippov <jcmvbkbc@gmail.com> | 2013-03-31 06:32:42 +0400 |
|---|---|---|
| committer | Chris Zankel <chris@zankel.net> | 2013-05-09 01:07:11 -0700 |
| commit | c92931b200156e304350e3e9f138e6abfb1f2913 (patch) | |
| tree | 0971196e9bd01c1aecc55753e28cdb80f1cda95b | |
| parent | 3ae908c99e944a7a5c4f4b2d8c603a6bc57b728b (diff) | |
| download | linux-3.10-c92931b200156e304350e3e9f138e6abfb1f2913.tar.gz linux-3.10-c92931b200156e304350e3e9f138e6abfb1f2913.tar.bz2 linux-3.10-c92931b200156e304350e3e9f138e6abfb1f2913.zip | |
xtensa: add irq flags trace support
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Chris Zankel <chris@zankel.net>
| -rw-r--r-- | arch/xtensa/Kconfig | 3 | ||||
| -rw-r--r-- | arch/xtensa/kernel/entry.S | 32 |
2 files changed, 35 insertions, 0 deletions
diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig index 13280f2780c..3eb543eacaa 100644 --- a/arch/xtensa/Kconfig +++ b/arch/xtensa/Kconfig @@ -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 diff --git a/arch/xtensa/kernel/entry.S b/arch/xtensa/kernel/entry.S index 63845f95079..3729b48d798 100644 --- a/arch/xtensa/kernel/entry.S +++ b/arch/xtensa/kernel/entry.S @@ -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 |