misc: Add routine to generate backtrace from within the application
E.g. to analyze the subscr_get/subscr_put behavior one can place
the generate_backtrace into the functions, recompile and then filter
the output with contrib/bt.py to get the function name, file and line.
diff --git a/openbsc/contrib/bt.py b/openbsc/contrib/bt.py
new file mode 100755
index 0000000..1b111ef
--- /dev/null
+++ b/openbsc/contrib/bt.py
@@ -0,0 +1,33 @@
+#!/usr/bin/env python
+
+import os
+
+f = open("unbalanced")
+lines = []
+for line in f:
+ lines.append(line)
+
+filenames = {}
+
+output = []
+for line in lines:
+ if "[0x" in line:
+ start = line.find("[")
+ end = line.find("]")
+ addr = line[start+1:end]
+ try:
+ file = filenames[addr]
+ except KeyError:
+ r = os.popen("addr2line -fs -e ./bsc_hack %s" % addr)
+ all = r.read().replace("\n", ",")
+ file = all
+ filenames[addr] = file
+
+ line = line.replace(addr, file)
+ output.append(line)
+
+g = open("unbalanced.2", "w")
+g.write("".join(output))
+
+
+
diff --git a/openbsc/include/openbsc/gsm_utils.h b/openbsc/include/openbsc/gsm_utils.h
index 7cd0578..1bd1bc5 100644
--- a/openbsc/include/openbsc/gsm_utils.h
+++ b/openbsc/include/openbsc/gsm_utils.h
@@ -32,4 +32,6 @@
int ms_pwr_ctl_lvl(enum gsm_band band, unsigned int dbm);
int ms_pwr_dbm(enum gsm_band band, u_int8_t lvl);
+
+void generate_backtrace();
#endif
diff --git a/openbsc/src/gsm_utils.c b/openbsc/src/gsm_utils.c
index de18dba..ddfd7f3 100644
--- a/openbsc/src/gsm_utils.c
+++ b/openbsc/src/gsm_utils.c
@@ -23,8 +23,10 @@
#include <openbsc/gsm_data.h>
#include <openbsc/gsm_utils.h>
+#include <execinfo.h>
#include <stdlib.h>
#include <string.h>
+#include <stdio.h>
#include <errno.h>
/* GSM 03.38 6.2.1 Charachter packing */
@@ -148,4 +150,21 @@
return -EINVAL;
}
+void generate_backtrace()
+{
+ int i, nptrs;
+ void *buffer[100];
+ char **strings;
+ nptrs = backtrace(buffer, ARRAY_SIZE(buffer));
+ printf("backtrace() returned %d addresses\n", nptrs);
+
+ strings = backtrace_symbols(buffer, nptrs);
+ if (!strings)
+ return;
+
+ for (i = 1; i < nptrs; i++)
+ printf("%s\n", strings[i]);
+
+ free(strings);
+}