Build: Enable code sharing between bootloader and SPE
Add CMake functions to allow sharing regions of code between
independently linked binaries.
Signed-off-by: Tamas Ban <tamas.ban@arm.com>
Change-Id: I6a6132d6c1558b242d8da1dedab14f93a852f81a
diff --git a/cmake/Common/StripUnsharedCode.cmake b/cmake/Common/StripUnsharedCode.cmake
new file mode 100644
index 0000000..a2df391
--- /dev/null
+++ b/cmake/Common/StripUnsharedCode.cmake
@@ -0,0 +1,40 @@
+#-------------------------------------------------------------------------------
+# Copyright (c) 2020, Arm Limited. All rights reserved.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+#-------------------------------------------------------------------------------
+
+# A CMake script to strip that part of an executable which is not meant to be
+# shared among distinct binaries (code reuse). Only used by GNUARM tool chain.
+#
+# INPUT parameters:
+# SHARED_SYMBOLS_FILE - File which contains the list of shared symbols.
+# EXECUTABLE_TO_STRIP - A copy of the original executable, which contains the sharable code.
+# From this copy of the executable the unshared code and symbols
+# are removed.
+#
+# OUTPUTS produced by this script:
+# - EXECUTABLE_TO_STRIP - Output file (stripped) has the same name as input file.
+
+find_program(GNUARM_STRIP arm-none-eabi-strip)
+if (GNUARM_STRIP STREQUAL "GNUARM_STRIP-NOTFOUND")
+ message(FATAL_ERROR "StripUnsharedCode.cmake: mandatory tool '${GNUARM_STRIP}' is missing.")
+endif()
+
+# Want to strip all unwanted symbols in one go, so concatenate those which must be kept
+file(STRINGS ${SHARED_SYMBOLS_FILE} SHARED_SYMBOL_NAME)
+foreach(_SYMBOL IN LISTS SHARED_SYMBOL_NAME)
+ list(APPEND ARGUMENT "-K${_SYMBOL}")
+endforeach()
+
+execute_process(COMMAND ${GNUARM_STRIP} ${ARGUMENT} ${EXECUTABLE_TO_STRIP}
+ TIMEOUT 120
+ OUTPUT_VARIABLE _RES
+ ERROR_VARIABLE _RES
+ RESULT_VARIABLE _STATUS_CODE
+ OUTPUT_STRIP_TRAILING_WHITESPACE)
+
+if (_STATUS_CODE GREATER 0)
+ message(FATAL_ERROR "ERROR: Failed to execute ${GNUARM_STRIP} ${_RES}")
+endif()