| #!/usr/bin/env python3 |
| # SPDX-License-Identifier: GPL-2.0 |
| # |
| # Usage: unwcheck.py FILE |
| # |
| # This script checks the unwind info of each function in file FILE |
| # and verifies that the sum of the region-lengths matches the total |
| # length of the function. |
| # |
| # Based on a shell/awk script originally written by Harish Patil, |
| # which was converted to Perl by Matthew Chapman, which was converted |
| # to Python by David Mosberger. |
| # |
| import os |
| import re |
| import sys |
| |
| if len(sys.argv) != 2: |
| print("Usage: %s FILE" % sys.argv[0]) |
| sys.exit(2) |
| |
| readelf = os.getenv("READELF", "readelf") |
| |
| start_pattern = re.compile("<([^>]*)>: \[0x([0-9a-f]+)-0x([0-9a-f]+)\]") |
| rlen_pattern = re.compile(".*rlen=([0-9]+)") |
| |
| def check_func (func, slots, rlen_sum): |
| if slots != rlen_sum: |
| global num_errors |
| num_errors += 1 |
| if not func: func = "[%#x-%#x]" % (start, end) |
| print("ERROR: %s: %lu slots, total region length = %lu" % (func, slots, rlen_sum)) |
| return |
| |
| num_funcs = 0 |
| num_errors = 0 |
| func = False |
| slots = 0 |
| rlen_sum = 0 |
| for line in os.popen("%s -u %s" % (readelf, sys.argv[1])): |
| m = start_pattern.match(line) |
| if m: |
| check_func(func, slots, rlen_sum) |
| |
| func = m.group(1) |
| start = int(m.group(2), 16) |
| end = int(m.group(3), 16) |
| slots = 3 * (end - start) / 16 |
| rlen_sum = 0 |
| num_funcs += 1 |
| else: |
| m = rlen_pattern.match(line) |
| if m: |
| rlen_sum += int(m.group(1)) |
| check_func(func, slots, rlen_sum) |
| |
| if num_errors == 0: |
| print("No errors detected in %u functions." % num_funcs) |
| else: |
| if num_errors > 1: |
| err="errors" |
| else: |
| err="error" |
| print("%u %s detected in %u functions." % (num_errors, err, num_funcs)) |
| sys.exit(1) |
