panic.c

   1 /*
   2  * panic.c --
   3  *
   4  *      Panic - print a message to the screen and bail.
   5  */
   6
   7 #include <marmot.h>
   8
   9 static char *types[] = {
  10    "Assertion failed:",
  11    "Unimplemented feature:",
  12    "Miscellaneous failure:"
  13 };
  14
  15
  16 /*
  17  * formatDec --
  18  *
  19  *      Limited decimal number formatter that only handles unsigned
  20  *      numbers less than 10,000,000.
  21  */
  22
  23 void
  24 formatDec(char s[], uint64 n)
  25 {
  26    uint64 p, k;
  27
  28    if (n >= 10000000) {
  29       return;
  30    }
  31
  32    for (p = 0; n; p++) {
  33       s[p] = '0' + n % 10;
  34       n /= 10;
  35    }
  36
  37    for (k = 0; k < p / 2; k++) {
  38       char c;
  39       c = s[k];
  40       s[k] = s[p - k - 1];
  41       s[p - k - 1] = c;
  42    }
  43 }
  44
  45 void
  46 Bug(uint64 type, char *cond, char *file, uint64 line)
  47 {
  48    Point p0, p1;
  49    uint64 maxStr = ((uint64)xResolution - 8) / 8;
  50    char lineStr[] = {'L', 'i', 'n', 'e', ':', ' ', 0, 0, 0, 0, 0, 0, 0, 0};
  51
  52    /*
  53     * Bug message looks like:
  54     *
  55     * Type message:
  56     * cond
  57     * file
  58     * Line line
  59     *
  60     * Type message can be:
  61     *
  62     *      BUG_ASSERT Assertion failed
  63     *      BUG_UNIMPL Unimplemented feature
  64     *      BUG_MISC   Miscellaneous failure
  65     *
  66     */
  67
  68    p0.x = 0;
  69    p0.y = 0;
  70    p1.x = 1280;
  71    p1.y = 4 * 16 + 5 * 4;
  72    ColorRectangle(COLOR_RED, p0, p1);
  73
  74    p0.x = 4;
  75    p0.y = 4;
  76    PrintMessage(COLOR_BLACK, p0, types[type]);
  77
  78    p0.y += 20;
  79    if (strlen(cond) > maxStr) {
  80       cond[maxStr - 1] = '\0';
  81    }
  82    PrintMessage(COLOR_BLACK, p0, cond);
  83
  84    p0.y += 20;
  85    if (strlen(file) > maxStr) {
  86       file[maxStr - 1] = '\0';
  87    }
  88    PrintMessage(COLOR_BLACK, p0, file);
  89
  90    p0.y += 20;
  91    formatDec(lineStr + 6, line);
  92    PrintMessage(COLOR_BLACK, p0, lineStr);
  93
  94    cli();
  95    asm("hlt");
  96 }