1 files changed, 69 insertions, 0 deletions
diff --git a/common/kallsyms.c b/common/kallsyms.c
new file mode 100644
index 0000000000..4069f4b701
--- /dev/null
+++ b/common/kallsyms.c
@@ -0,0 +1,69 @@
+#include <common.h>
+#include <init.h>
+#include <kallsyms.h>
+
+/* These will be re-linked against their real values during the second link stage */
+extern const unsigned long kallsyms_addresses[] __attribute__((weak));
+extern const unsigned long kallsyms_num_syms __attribute__((weak));
+extern const u8 kallsyms_names[] __attribute__((weak));
+
+extern const u8 kallsyms_token_table[] __attribute__((weak));
+extern const u16 kallsyms_token_index[] __attribute__((weak));
+
+extern const unsigned long kallsyms_markers[] __attribute__((weak));
+
+/* expand a compressed symbol data into the resulting uncompressed string,
+   given the offset to where the symbol is in the compressed stream */
+static unsigned int kallsyms_expand_symbol(unsigned int off, char *result)
+{
+	int len, skipped_first = 0;
+	const u8 *tptr, *data;
+
+	/* get the compressed symbol length from the first symbol byte */
+	data = &kallsyms_names[off];
+	len = *data;
+	data++;
+
+	/* update the offset to return the offset for the next symbol on
+	 * the compressed stream */
+	off += len + 1;
+
+	/* for every byte on the compressed symbol data, copy the table
+	   entry for that byte */
+	while(len) {
+		tptr = &kallsyms_token_table[ kallsyms_token_index[*data] ];
+		data++;
+		len--;
+
+		while (*tptr) {
+			if(skipped_first) {
+				*result = *tptr;
+				result++;
+			} else
+				skipped_first = 1;
+			tptr++;
+		}
+	}
+
+	*result = '\0';
+
+	/* return to offset to the next symbol */
+	return off;
+}
+
+/* Lookup the address for this symbol. Returns 0 if not found. */
+unsigned long kallsyms_lookup_name(const char *name)
+{
+	char namebuf[KSYM_NAME_LEN];
+	unsigned long i;
+	unsigned int off;
+
+	for (i = 0, off = 0; i < kallsyms_num_syms; i++) {
+		off = kallsyms_expand_symbol(off, namebuf);
+
+		if (strcmp(namebuf, name) == 0)
+			return kallsyms_addresses[i];
+	}
+//	return module_kallsyms_lookup_name(name);
+	return 0;
+}