1 files changed, 64 insertions, 0 deletions
diff --git a/runtime/io.c b/runtime/io.c
index 3371df16..8756a48d 100644
--- a/runtime/io.c
+++ b/runtime/io.c
@@ -17,3 +17,67 @@ void dlog (const char *fmt, ...)
   va_end(args);
 }
 
+
+static const char * (*_stp_kallsyms_lookup)(unsigned long addr,
+			    unsigned long *symbolsize,
+			    unsigned long *offset,
+			    char **modname, char *namebuf)=(void *)KALLSYMS_LOOKUP;
+
+
+#define STP_BUF_LEN 8191
+
+/* FIXME. These need to be per-cpu */
+static char _stp_pbuf[STP_BUF_LEN+1];
+static int _stp_pbuf_len = STP_BUF_LEN;
+
+void _stp_print_buf (const char *fmt, ...)
+{
+  int num;
+  va_list args;
+  char *buf = _stp_pbuf + STP_BUF_LEN - _stp_pbuf_len;
+  va_start(args, fmt);
+  num = vscnprintf(buf, _stp_pbuf_len, fmt, args);
+  va_end(args);
+  if (num > 0)
+    _stp_pbuf_len -= num;
+}
+
+void _stp_print_buf_init (void)
+{
+  _stp_pbuf_len = STP_BUF_LEN;
+  _stp_pbuf[0] = 0;
+}
+
+void _stp_print_symbol(const char *fmt, unsigned long address)
+{
+        char *modname;
+        const char *name;
+        unsigned long offset, size;
+        char namebuf[KSYM_NAME_LEN+1];
+
+        name = _stp_kallsyms_lookup(address, &size, &offset, &modname, namebuf);
+
+        if (!name)
+                _stp_print_buf("0x%lx", address);
+        else {
+	  if (modname)
+	    _stp_print_buf("%s+%#lx/%#lx [%s]", name, offset,
+			   size, modname);
+	  else
+	    _stp_print_buf("%s+%#lx/%#lx", name, offset, size);
+        }
+}
+
+ 
+unsigned long cur_ret_addr (struct pt_regs *regs)
+{
+#ifdef __x86_64__
+  unsigned long *ra = (unsigned long *)regs->rsp;
+#else
+  unsigned long *ra = (unsigned long *)regs->esp;
+#endif
+  if (ra)
+    return *ra;
+  else
+    return 0;
+}