git.gag.com Git - fw/altos/blob - src/lpc/figure-checksum

   1 #!/usr/bin/env nickle
   2
   3 autoimport Process;
   4
   5 int byteflip(int x) {
   6         return ((x >> 24) & 0xff) | ((x >> 8) & 0xff00) | ((x << 8) & 0xff0000) | ((x << 24) & 0xff000000);
   7 }
   8
   9 void main () {
  10         file    input = popen(popen_direction.read, true, "objdump",
  11                               "objdump", "-j", ".text",
  12                               "--start-address=0",
  13                               "--stop-address=0x20",
  14                               "-s", argv[1]);
  15         int sum = 0;
  16
  17         void add_in(int addr, int value) {
  18                 if (addr < 0x1c) {
  19                         sum += value;
  20                 } else if (addr == 0x1c) {
  21                         printf ("-DCKSUM=0x%08x\n", -sum & 0xffffffff);
  22                         exit(0);
  23                 }
  24         }
  25         while (!File::end(input)) {
  26                 string line = File::fgets(input);
  27                 string[] words = String::wordsplit(line, " ");
  28
  29                 if (dim(words) < 5)
  30                     continue;
  31                 if (words[0] == "0000" || words[0] == "0010") {
  32                         int addr = string_to_integer(words[0], 16);
  33                         for (int i = 0; i < 4; i++)
  34                                 add_in(addr + i * 4, byteflip(string_to_integer(words[i+1], 16)));
  35                 }
  36         }
  37 }
  38
  39 main();