arch/ia64/scripts/unwcheck.py

   1 #!/usr/bin/python
   2 # SPDX-License-Identifier: GPL-2.0
   3 #
   4 # Usage: unwcheck.py FILE
   5 #
   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.
   9 #
  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.
  13 #
  14 import os
  15 import re
  16 import sys
  17
  18 if len(sys.argv) != 2:
  19     print("Usage: %s FILE" % sys.argv[0])
  20     sys.exit(2)
  21
  22 readelf = os.getenv("READELF", "readelf")
  23
  24 start_pattern = re.compile("<([^>]*)>: \[0x([0-9a-f]+)-0x([0-9a-f]+)\]")
  25 rlen_pattern  = re.compile(".*rlen=([0-9]+)")
  26
  27 def check_func (func, slots, rlen_sum):
  28     if slots != rlen_sum:
  29         global num_errors
  30         num_errors += 1
  31         if not func: func = "[%#x-%#x]" % (start, end)
  32         print("ERROR: %s: %lu slots, total region length = %lu" % (func, slots, rlen_sum))
  33     return
  34
  35 num_funcs = 0
  36 num_errors = 0
  37 func = False
  38 slots = 0
  39 rlen_sum = 0
  40 for line in os.popen("%s -u %s" % (readelf, sys.argv[1])):
  41     m = start_pattern.match(line)
  42     if m:
  43         check_func(func, slots, rlen_sum)
  44
  45         func  = m.group(1)
  46         start = int(m.group(2), 16)
  47         end   = int(m.group(3), 16)
  48         slots = 3 * (end - start) / 16
  49         rlen_sum = 0
  50         num_funcs += 1
  51     else:
  52         m = rlen_pattern.match(line)
  53         if m:
  54             rlen_sum += int(m.group(1))
  55 check_func(func, slots, rlen_sum)
  56
  57 if num_errors == 0:
  58     print("No errors detected in %u functions." % num_funcs)
  59 else:
  60     if num_errors > 1:
  61         err="errors"
  62     else:
  63         err="error"
  64     print("%u %s detected in %u functions." % (num_errors, err, num_funcs))
  65     sys.exit(1)