1 files changed, 127 insertions, 0 deletions
diff --git a/roms/skiboot/core/gcov-profiling.c b/roms/skiboot/core/gcov-profiling.c
new file mode 100644
index 000000000..fdad51ed9
--- /dev/null
+++ b/roms/skiboot/core/gcov-profiling.c
@@ -0,0 +1,127 @@
+// SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
+/*
+ * libgcov skeleton reimplementation to build skiboot with gcov support
+ *
+ * Copyright 2015-2018 IBM Corp.
+ */
+
+#include <skiboot.h>
+#include <compiler.h>
+#include <stdio.h>
+
+typedef long gcov_type;
+
+/*
+ * This is GCC internal data structure. See GCC libgcc/libgcov.h for
+ * details.
+ *
+ * If gcc changes this, we have to change it.
+ */
+
+typedef unsigned int gcov_unsigned_int;
+
+#if __GNUC__ == 4 && __GNUC_MINOR__ >= 9
+#define GCOV_COUNTERS                   9
+#else
+#define GCOV_COUNTERS                   8
+#endif
+
+struct gcov_info
+{
+        gcov_unsigned_int version;
+        struct gcov_info *next;
+        gcov_unsigned_int stamp;
+        const char *filename;
+        void (*merge[GCOV_COUNTERS])(gcov_type *, unsigned int);
+        unsigned int n_functions;
+        struct gcov_fn_info **functions;
+};
+
+/* We have a list of all gcov info set up at startup */
+struct gcov_info *gcov_info_list;
+
+void __gcov_init(struct gcov_info* f);
+void skiboot_gcov_done(void);
+void __gcov_flush(void);
+void __gcov_merge_add(gcov_type *counters, unsigned int n_counters);
+void __gcov_merge_single(gcov_type *counters, unsigned int n_counters);
+void __gcov_merge_delta(gcov_type *counters, unsigned int n_counters);
+void __gcov_merge_ior(gcov_type *counters, unsigned int n_counters);
+void __gcov_merge_time_profile(gcov_type *counters, unsigned int n_counters);
+void __gcov_exit(void);
+
+void __gcov_init(struct gcov_info* f)
+{
+	static gcov_unsigned_int version = 0;
+
+	if (version == 0) {
+		printf("GCOV version: %u\n", f->version);
+		version = f->version;
+	}
+
+	if (gcov_info_list)
+		f->next = gcov_info_list;
+
+	gcov_info_list = f;
+	return;
+}
+
+void skiboot_gcov_done(void)
+{
+	struct gcov_info *i = gcov_info_list;
+
+	if (i->filename)
+		printf("GCOV: gcov_info_list looks sane (first file: %s)\n",
+		       i->filename);
+	else
+		prlog(PR_WARNING, "GCOV: gcov_info_list doesn't look sane. "
+		      "i->filename == NULL.");
+
+	printf("GCOV: gcov_info_list at 0x%p\n", gcov_info_list);
+}
+
+void __gcov_merge_add(gcov_type *counters, unsigned int n_counters)
+{
+	(void)counters;
+	(void)n_counters;
+
+	return;
+}
+
+void __gcov_flush(void)
+{
+	return;
+}
+
+void __gcov_merge_single(gcov_type *counters, unsigned int n_counters)
+{
+	(void)counters;
+	(void)n_counters;
+
+	return;
+}
+
+void __gcov_merge_delta(gcov_type *counters, unsigned int n_counters)
+{
+	(void)counters;
+	(void)n_counters;
+
+	return;
+}
+
+void __gcov_merge_ior(gcov_type *counters, unsigned int n_counters)
+{
+	(void)counters;
+	(void)n_counters;
+	return;
+}
+
+void __gcov_merge_time_profile(gcov_type *counters, unsigned int n_counters)
+{
+	(void)counters;
+	(void)n_counters;
+}
+
+void __gcov_exit(void)
+{
+}