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| author | Jerome Forissier <jerome.forissier@linaro.org> | 2017-10-12 10:11:45 +0200 |
|---|---|---|
| committer | Jérôme Forissier <jerome.forissier@linaro.org> | 2017-10-12 10:59:49 +0200 |
| commit | 7411e0e1ebd42a8c649bdfb2e7dbf9958caf7af9 (patch) | |
| tree | 6763340510cba0d8051439e85558c7cc28fe0e99 /mk/config.mk | |
| parent | 3ff067c414d6b3039c6f4edaf9fc8972fadf62d2 (diff) | |
Add comment about CFG_UNWIND
Update the comment in the main configuration file to state that
CFG_UNWIND should be disabled in production builds.
Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org>
Suggested-by: Etienne Carriere <etienne.carriere@linaro.org>
Reviewed-by: Etienne Carriere <etienne.carriere@linaro.org>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>
Diffstat (limited to 'mk/config.mk')
| -rw-r--r-- | mk/config.mk | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/mk/config.mk b/mk/config.mk index 6038db7e..25625d72 100644 --- a/mk/config.mk +++ b/mk/config.mk @@ -152,13 +152,17 @@ CFG_LIBUTILS_WITH_ISOC ?= y # With CFG_TA_FLOAT_SUPPORT enabled TA code is free use floating point types CFG_TA_FLOAT_SUPPORT ?= y -# Stack unwinding: print a stack dump to the console on abort +# Stack unwinding: print a stack dump to the console on core or TA abort, or +# when a TA panics. # If CFG_UNWIND is enabled, both the kernel and user mode call stacks can be # unwound (not paged TAs, however). # Note that 32-bit ARM code needs unwind tables for this to work, so enabling # this option will increase the size of the 32-bit TEE binary by a few KB. # Similarly, TAs have to be compiled with -funwind-tables (default when the # option is set) otherwise they can't be unwound. +# Warning: since the unwind sequence for user-mode (TA) code is implemented in +# the privileged layer of OP-TEE, enabling this feature will weaken the +# user/kernel isolation. Therefore it should be disabled in release builds. ifeq ($(CFG_TEE_CORE_DEBUG),y) CFG_UNWIND ?= y endif |