scripts/check-localplt.awk

   1 # This is an awk script to process the output of elf/check-localplt.
   2 # The first file argument is the file of expected results.
   3 # Each line is either a comment starting with # or it looks like:
   4 #       libfoo.so: function
   5 # or
   6 #       libfoo.so: function + {RELA|REL} RELOC
   7 # or
   8 #       libfoo.so: function ?
   9 # The first entry means that one is required.
  10 # The second entry means that one is required and relocation may also be
  11 # {RELA|REL} RELOC.
  12 # The third entry means that a PLT entry for function is optional in
  13 # libfoo.so.
  14 # The second file argument is - and this (stdin) receives the output
  15 # of the check-localplt program.
  16
  17 BEGIN { result = 0 }
  18
  19 FILENAME != "-" && /^#/ { next }
  20
  21 FILENAME != "-" {
  22   if (NF == 5 && $3 == "+" && ($4 == "RELA" || $4 == "REL")) {
  23     accept_type[$1 " " $2] = $4;
  24     accept_reloc[$1 " " $2] = $5;
  25   } else if (NF != 2 && !(NF == 3 && $3 == "?")) {
  26     printf "%s:%d: bad data line: %s\n", FILENAME, FNR, $0 > "/dev/stderr";
  27     result = 2;
  28   } else {
  29     accept[$1 " " $2] = NF == 2;
  30   }
  31   next;
  32 }
  33
  34 NF != 2 && !(NF == 4 && ($3 == "RELA" || $3 == "REL")) {
  35   print "Unexpected output from check-localplt:", $0 > "/dev/stderr";
  36   result = 2;
  37   next
  38 }
  39
  40 {
  41   key = $1 " " $2
  42   if ($3 == "RELA" || $3 == "REL") {
  43     # Entries like:
  44     # libc.so: free + RELA R_X86_64_GLOB_DAT
  45     # may be ignored.
  46     if (key in accept_type && accept_type[key] == $3 && accept_reloc[key] == $4) {
  47       # Match
  48       # libc.so: free + RELA R_X86_64_GLOB_DAT
  49       delete accept_type[key]
  50     }
  51   } else if (NF == 2 && key in accept_reloc) {
  52     # Match
  53     # libc.so: free
  54     # against
  55     # libc.so: free + RELA R_X86_64_GLOB_DAT
  56     if (key in accept_type)
  57       delete accept_type[key]
  58   } else if (key in accept) {
  59     delete accept[key]
  60   } else {
  61     print "Extra PLT reference:", $0;
  62     if (result == 0)
  63       result = 1;
  64   }
  65 }
  66
  67 END {
  68   for (key in accept) {
  69     if (accept[key]) {
  70       # It's mandatory.
  71       print "Missing required PLT reference:", key;
  72       result = 1;
  73     }
  74   }
  75
  76   for (key in accept_type) {
  77     # It's mandatory.
  78     print "Missing required PLT or " accept_reloc[key] " reference:", key;
  79     result = 1;
  80   }
  81
  82   exit(result);
  83 }