2 # SPDX-License-Identifier: GPL-2.0
4 # Usage: unwcheck.py FILE
6 # This script checks the unwind info of each function in file FILE
7 # and verifies that the sum of the region-lengths matches the total
8 # length of the function.
10 # Based on a shell/awk script originally written by Harish Patil,
11 # which was converted to Perl by Matthew Chapman, which was converted
12 # to Python by David Mosberger.
18 if len(sys.argv) != 2:
19 print("Usage: %s FILE" % sys.argv[0])
22 readelf = os.getenv("READELF", "readelf")
24 start_pattern = re.compile("<([^>]*)>: \[0x([0-9a-f]+)-0x([0-9a-f]+)\]")
25 rlen_pattern = re.compile(".*rlen=([0-9]+)")
27 def check_func (func, slots, rlen_sum):
31 if not func: func = "[%#x-%#x]" % (start, end)
32 print("ERROR: %s: %lu slots, total region length = %lu" % (func, slots, rlen_sum))
40 for line in os.popen("%s -u %s" % (readelf, sys.argv[1])):
41 m = start_pattern.match(line)
43 check_func(func, slots, rlen_sum)
46 start = int(m.group(2), 16)
47 end = int(m.group(3), 16)
48 slots = 3 * (end - start) / 16
52 m = rlen_pattern.match(line)
54 rlen_sum += int(m.group(1))
55 check_func(func, slots, rlen_sum)
58 print("No errors detected in %u functions." % num_funcs)
64 print("%u %s detected in %u functions." % (num_errors, err, num_funcs))