cmake: build arm sel_ldr and nacl_helper_bootstrap with 64K page size

Build arm sel_ldr and nacl_helper_bootstrap with 64K page size alignment.
Makes it compatible with 16k page size kernels.
CMake plumbing.

Author: illwieckz

cmake/NaClFlags.cmake

@@ -1,5 +1,11 @@
 option(USE_WERROR "Tell the compiler to make the build fail when warnings are present." OFF)
 
+if (YOKAI_TARGET_SYSTEM_LINUX_COMPATIBILITY)
+	if (YOKAI_TARGET_ARCH_ARMHF)
+		option(USE_ARMHF_LARGE_PAGESIZE "Build armhf binaries with large page size." ON)
+	endif()
+endif()
+
 macro(set_ASM_flag FLAG)
 	set(lang ASM)
 	if (${ARGC} GREATER 1)
@@ -84,6 +90,16 @@ macro(set_linker_flag FLAG)
 	endforeach()
 endmacro()
 
+if (YOKAI_TARGET_SYSTEM_LINUX_COMPATIBILITY)
+	if (USE_ARMHF_LARGE_PAGESIZE)
+		set(MAX_PAGE_SIZE 0x10000)
+	else()
+		set(MAX_PAGE_SIZE 0x1000)
+	endif()
+
+	set_linker_flag("-Wl,-z,max-page-size=${MAX_PAGE_SIZE}")
+endif()
+
 #TODO: Import from SetUpClang() from (root)/SConstruct.
 #TODO: This is mostly ASAN configurations.
 

src/trusted/service_runtime/linux/CMakeLists.txt

@@ -111,7 +111,7 @@ add_custom_target(nacl_bootstrap_raw
 		-m "${LD_EMUL}"
 		--build-id
 		-static
-		-z "max-page-size=0x1000"
+		-z "max-page-size=${MAX_PAGE_SIZE}"
 		--defsym RESERVE_TOP="${RESERVE_TOP}"
 		--orphan-handling=discard
 		--script "${CMAKE_CURRENT_LIST_DIR}/nacl_bootstrap.x"