lpc: Initial lpcxpresso bits

[fw/altos] / src / lpc / figure-checksum

diff --git a/src/lpc/figure-checksum b/src/lpc/figure-checksum
new file mode 100755 (executable)
index 0000000..0b1de57
--- /dev/null
+++ b/src/lpc/figure-checksum
@@ -0,0 +1,39 @@
+#!/usr/bin/env nickle
+
+autoimport Process;
+
+int byteflip(int x) {
+       return ((x >> 24) & 0xff) | ((x >> 8) & 0xff00) | ((x << 8) & 0xff0000) | ((x << 24) & 0xff000000);
+}
+
+void main () {
+       file    input = popen(popen_direction.read, true, "objdump",
+                             "objdump", "-j", ".text",
+                             "--start-address=0",
+                             "--stop-address=0x20",
+                             "-s", argv[1]);
+       int sum = 0;
+
+       void add_in(int addr, int value) {
+               if (addr < 0x1c) {
+                       sum += value;
+               } else if (addr == 0x1c) {
+                       printf ("-DCKSUM=0x%08x\n", -sum & 0xffffffff);
+                       exit(0);
+               }
+       }
+       while (!File::end(input)) {
+               string line = File::fgets(input);
+               string[] words = String::wordsplit(line, " ");
+
+               if (dim(words) < 5)
+                   continue;
+               if (words[0] == "0000" || words[0] == "0010") {
+                       int addr = string_to_integer(words[0], 16);
+                       for (int i = 0; i < 4; i++)
+                               add_in(addr + i * 4, byteflip(string_to_integer(words[i+1], 16)));
+               }
+       }
+}
+
+main();