Add BTI enablement in TS
Add BTI_ENABLED option which enables bti in the sp,
opteesp and arm-linux environments.
Signed-off-by: Gabor Toth <gabor.toth2@arm.com>
Change-Id: I2ed477f52000839c61d4f0631c5fd19465c5b7a3
diff --git a/environments/arm-linux/default_toolchain_file.cmake b/environments/arm-linux/default_toolchain_file.cmake
index d5efc4c..308c2a7 100644
--- a/environments/arm-linux/default_toolchain_file.cmake
+++ b/environments/arm-linux/default_toolchain_file.cmake
@@ -22,6 +22,19 @@
set(TS_WARNING_FLAGS "-Wall -Werror" CACHE STRING "Compiler flags affecting generating warning messages.")
set(TS_MANDATORY_LINKER_FLAGS "" CACHE STRING "Linker flags needed for correct builds.")
+set(BTI_ENABLED unset CACHE STRING "Enable Branch Target Identification (BTI)")
+set_property(CACHE BTI_ENABLED PROPERTY STRINGS unset OFF ON)
+
+if(BTI_ENABLED STREQUAL "ON")
+ # branch-protection enables bti while compile force-bti tells the linker to
+ # warn if some object files lack the .note.gnu.property section with the BTI
+ # flag, and to turn on the BTI flag in the output anyway.
+ set(TS_MANDATORY_AARCH_FLAGS "${TS_MANDATORY_AARCH_FLAGS} -mbranch-protection=bti")
+ set(TS_MANDATORY_LINKER_FLAGS "${TS_MANDATORY_LINKER_FLAGS} -zforce-bti")
+elseif(BTI_ENABLED STREQUAL "OFF")
+ set(TS_MANDATORY_AARCH_FLAGS "${TS_MANDATORY_AARCH_FLAGS} -mbranch-protection=none")
+endif()
+
# Set flags affecting all build types
string(APPEND CMAKE_C_FLAGS_INIT " ${TS_MANDATORY_AARCH_FLAGS}")
string(APPEND CMAKE_CXX_FLAGS_INIT " ${TS_MANDATORY_AARCH_FLAGS}")