build: add a build-time check the builtins bundle fits
Check the size of the constructed cpio archive against the space allocated
to hold it at boot. This potentially avoids confusion if the boot process
does something stupid (e.g. like Renode blindly loading a file).
Change-Id: Ib4bc451bd5822ddf3ab3e06f6c0aaaeffae11d63
diff --git a/cantrip_builtins.mk b/cantrip_builtins.mk
index ba1c9a4..cf19c13 100644
--- a/cantrip_builtins.mk
+++ b/cantrip_builtins.mk
@@ -51,11 +51,26 @@
mkdir -p $@
cp $(CANTRIP_APPS_DEBUG) $(CANTRIP_MODEL_DEBUG) ${CANTRIP_SCRIPTS} $@
+# Dredge platform config for space allocated to hold builtins bundle;
+# this is used below to check the constructed bundle fits.
+CPIO_SIZE_BYTES=$(shell awk '/^#define[ \t]+CPIO_SIZE_BYTES/ { print strtonum($$3) }' \
+ $(CANTRIP_SRC_DIR)/apps/system/platforms/${PLATFORM}/platform.camkes)
+
$(EXT_BUILTINS_RELEASE): $(CANTRIP_OUT_RELEASE)/builtins
ls -1 $< | $(CPIO) -o -D $< $(BUILTINS_CPIO_OPTS) -O "$@"
+ builtins_size=$$(ls -l $@ | awk '{ print $$5; }'); \
+ test "$${builtins_size}" -gt "${CPIO_SIZE_BYTES}" && {\
+ echo "Builtins bundle too big: $${builtins_size} > ${CPIO_SIZE_BYTES}"; \
+ exit 1; \
+ } || { exit 0; }
$(EXT_BUILTINS_DEBUG): $(CANTRIP_OUT_DEBUG)/builtins
ls -1 $< | $(CPIO) -o -D $< $(BUILTINS_CPIO_OPTS) -O "$@"
+ builtins_size=$$(ls -l $@ | awk '{ print $$5; }'); \
+ test "$${builtins_size}" -gt "${CPIO_SIZE_BYTES}" && {\
+ echo "Builtins bundle too big: $${builtins_size} > ${CPIO_SIZE_BYTES}"; \
+ exit 1; \
+ } || { exit 0; }
## Generates cpio archive of Cantrip builtins with debugging suport
cantrip-builtins-debug: $(EXT_BUILTINS_DEBUG)
