The script runs addresses through addr2line to get file names and line
numbers. Also prints out source code lines if files are available.
For example
0x004013f5: ac_test_exec at x86/access.c:818
}
> ac_test_setup_pte(at, pool);
r = ac_test_do_access(at);
0x004014dd: ac_test_run at x86/access.c:852
++tests;
> successes += ac_test_exec(&at, &pool);
} while (ac_test_bump(&at));
0x0040157d: main at x86/access.c:873
printf("starting test\n\n");
> r = ac_test_run();
return r ? 0 : 1;
0x0040028e: start64 at x86/cstart64.S:206
lea __argv(%rip), %rsi
> call main
mov %eax, %edi
Signed-off-by: Peter Feiner <pfeiner@xxxxxxxxxx>
---
scripts/pretty_print_stacks.py | 89 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 89 insertions(+)
create mode 100755 scripts/pretty_print_stacks.py
diff --git a/scripts/pretty_print_stacks.py b/scripts/pretty_print_stacks.py
new file mode 100755
index 0000000..ee5a52e
--- /dev/null
+++ b/scripts/pretty_print_stacks.py
@@ -0,0 +1,89 @@
+#!/usr/bin/env python
+
+import re
+import subprocess
+import sys
+import traceback
+
+# Subvert output buffering.
+def puts(string):
+ sys.stdout.write(string)
+ sys.stdout.flush()
+
+def pretty_print_stack(binary, line):
+ addrs = line.split()[1:]
+ # Addresses are return addresses unless preceded by a '@'. We want the
+ # caller address so line numbers are more intuitive. Thus we subtract 1
+ # from the address to get the call code.
+ for i in range(len(addrs)):
+ addr = addrs[i]
+ if addr.startswith('@'):
+ addrs[i] = addr[1:]
+ else:
+ addrs[i] = '%lx' % (int(addrs[i], 16) - 1)
+
+ # Output like this:
+ # 0x004002be: start64 at path/to/kvm-unit-tests/x86/cstart64.S:208
+ # (inlined by) test_ept_violation at path/to/kvm-unit-tests/x86/vmx_tests.c:1719 (discriminator 1)
+ cmd = ['addr2line', '-e', binary, '-i', '-f', '--pretty', '--address']
+ cmd.extend(addrs)
+
+ p = subprocess.Popen(cmd, stdout=subprocess.PIPE)
+ out, err = p.communicate()
+ if p.returncode != 0:
+ puts(line)
+ return
+
+ for line in out.splitlines():
+ m = re.match('(.*) at [^ ]*/kvm-unit-tests/([^ ]*):([0-9]+)(.*)', line)
+ if m is None:
+ puts('%s\n' % line)
+ return
+
+ head, path, line, tail = m.groups()
+ line = int(line)
+ puts('%s at %s:%d%s\n' % (head, path, line, tail))
+ try:
+ lines = open(path).readlines()
+ except IOError:
+ continue
+ if line > 1:
+ puts(' %s\n' % lines[line - 2].rstrip())
+ puts(' > %s\n' % lines[line - 1].rstrip())
+ if line < len(lines):
+ puts(' %s\n' % lines[line].rstrip())
+
+def main():
+ if len(sys.argv) != 2:
+ sys.stderr.write('usage: %s <kernel>\n' % sys.argv[0])
+ sys.exit(1)
+
+ binary = sys.argv[1]
+
+ try:
+ while True:
+ # Subvert input buffering.
+ line = sys.stdin.readline()
+ if line == '':
+ break
+
+ if not line.strip().startswith('STACK:'):
+ puts(line)
+ continue
+
+ try:
+ pretty_print_stack(binary, line)
+ except Exception:
+ puts('Error pretty printing stack:\n')
+ puts(traceback.format_exc())
+ puts('Continuing without pretty printing...\n')
+ while True:
+ puts(line)
+ line = sys.stdin.readline()
+ if line == '':
+ break
+ except:
+ sys.exit(1)
+
+if __name__ == '__main__':
+ main()
--
2.7.0.rc3.207.g0ac5344
--
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