1 files changed, 36 insertions, 0 deletions
diff --git a/kexec/symbols.c b/kexec/symbols.c
new file mode 100644
index 0000000..04377ca
--- /dev/null
+++ b/kexec/symbols.c
@@ -0,0 +1,36 @@
+#include <stdio.h>
+#include <string.h>
+#include "kexec.h"
+
+/* Retrieve kernel symbol virtual address from /proc/kallsyms */
+unsigned long long get_kernel_sym(const char *symbol)
+{
+	const char *kallsyms = "/proc/kallsyms";
+	char sym[128];
+	char line[128];
+	FILE *fp;
+	unsigned long long vaddr;
+	char type;
+
+	fp = fopen(kallsyms, "r");
+	if (!fp) {
+		fprintf(stderr, "Cannot open %s\n", kallsyms);
+		return 0;
+	}
+
+	while (fgets(line, sizeof(line), fp) != NULL) {
+		if (sscanf(line, "%llx %c %s", &vaddr, &type, sym) != 3)
+			continue;
+		if (strcmp(sym, symbol) == 0) {
+			dbgprintf("kernel symbol %s vaddr = %16llx\n",
+					symbol, vaddr);
+			fclose(fp);
+			return vaddr;
+		}
+	}
+
+	dbgprintf("Cannot get kernel %s symbol address\n", symbol);
+
+	fclose(fp);
+	return 0;
+}