util/cbfstool/fmaptool: Generate list of terminal sections

This change adds support in fmaptool to generate a macro in C header
file that provides a list of section names that do not have any
subsections. This is useful for performing build time tests on these
sections.

BUG=b:171534504

Change-Id: Ie32bb8af4a722d329f9d4729722b131ca352d47a
Signed-off-by: Furquan Shaikh <furquan@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/47883
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>

1 files changed, 24 insertions, 0 deletions

diff --git a/util/cbfstool/fmaptool.c b/util/cbfstool/fmaptool.c
index 9f5803d8ee15..4ba5967b8469 100644
--- a/util/cbfstool/fmaptool.c
+++ b/util/cbfstool/fmaptool.c
@@ -14,6 +14,12 @@
 #define HEADER_FMAP_OFFSET "FMAP_OFFSET"
 #define HEADER_FMAP_SIZE "FMAP_SIZE"
 
+/*
+ * Macro name used in the generated C header file to provide list of section names that do not
+ * have any sub-sections.
+ */
+#define HEADER_FMAP_TERMINAL_SECTIONS "FMAP_TERMINAL_SECTIONS"
+
 enum fmaptool_return {
 	FMAPTOOL_EXIT_SUCCESS = 0,
 	FMAPTOOL_EXIT_BAD_ARGS,
@@ -71,6 +77,20 @@ static void list_cbfs_section_names(FILE *out)
 	fputc('\n', out);
 }
 
+static void write_header_fmap_terminal_section_names(FILE *header,
+						     const struct flashmap_descriptor *root)
+{
+	assert(root);
+
+	if (root->list_len == 0) {
+		fprintf(header, "%s ", root->name);
+		return;
+	}
+
+	fmd_foreach_child(child, root)
+		write_header_fmap_terminal_section_names(header, child);
+}
+
 static void write_header_fmap_sections(FILE *header, const struct flashmap_descriptor *root,
 				       unsigned int offset)
 {
@@ -116,6 +136,10 @@ static bool write_header(const char *out_fname,
 	fprintf(header, "#define %s %#x\n", HEADER_FMAP_OFFSET, fmap_offset);
 	fprintf(header, "#define %s %#x\n\n", HEADER_FMAP_SIZE, fmap_size);
 
+	fprintf(header, "#define %s \"", HEADER_FMAP_TERMINAL_SECTIONS);
+	write_header_fmap_terminal_section_names(header, root);
+	fprintf(header, "\"\n\n");
+
 	write_header_fmap_sections(header, root, 0);
 	fputs("\n", header);