PR6866: First pass at translating addresses to symbol names through vma.

1 files changed, 41 insertions, 0 deletions

diff --git a/testsuite/systemtap.context/usymbols.c b/testsuite/systemtap.context/usymbols.c
new file mode 100644
index 00000000..f8ee05b5
--- /dev/null
+++ b/testsuite/systemtap.context/usymbols.c
@@ -0,0 +1,41 @@
+/* usymbol test case
+ * Copyright (C) 2008, Red Hat Inc.
+ *                                                          
+ * This file is part of systemtap, and is free software.  You can
+ * redistribute it and/or modify it under the terms of the GNU General
+ * Public License (GPL); either version 2, or (at your option) any
+ * later version.
+ *
+ * Uses signal to tranfer user space addresses into the kernel where a
+ * probe on sigaction will extract them and produce the symbols.  To
+ * poke into the executable we get the sa_handler, to poke into glibc
+ * we get the sa_restorer fields in the stap script.
+ *
+ * XXX - Seems sa_restorer isn't set on all architectures.  should use
+ * our own shared library and set signal handler from there.  Also
+ * need to handle @plt symbols (setting a handler in the main
+ * executable that is in a shared library will have the @plt address,
+ * not the address inside the shared library).
+ */
+
+#include <signal.h>
+typedef void (*sighandler_t)(int);
+
+void
+handler (int signum)
+{
+  /* dummy handler, just used for the address... */
+}
+
+sighandler_t
+libc_handler (void *func)
+{
+  return (sighandler_t) func;
+}
+
+int
+main (int argc, char *argv[], char *envp[])
+{
+  // Use SIGFPE since we never expect that to be triggered.
+  signal(SIGFPE, handler);
+}