scripts/mod/mk_elfconfig.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4 #include <elf.h>
   5
   6 int
   7 main(int argc, char **argv)
   8 {
   9         unsigned char ei[EI_NIDENT];
  10         union { short s; char c[2]; } endian_test;
  11
  12         if (argc != 2) {
  13                 fprintf(stderr, "Error: no arch\n");
  14         }
  15         if (fread(ei, 1, EI_NIDENT, stdin) != EI_NIDENT) {
  16                 fprintf(stderr, "Error: input truncated\n");
  17                 return 1;
  18         }
  19         if (memcmp(ei, ELFMAG, SELFMAG) != 0) {
  20                 fprintf(stderr, "Error: not ELF\n");
  21                 return 1;
  22         }
  23         switch (ei[EI_CLASS]) {
  24         case ELFCLASS32:
  25                 printf("#define KERNEL_ELFCLASS ELFCLASS32\n");
  26                 break;
  27         case ELFCLASS64:
  28                 printf("#define KERNEL_ELFCLASS ELFCLASS64\n");
  29                 break;
  30         default:
  31                 exit(1);
  32         }
  33         switch (ei[EI_DATA]) {
  34         case ELFDATA2LSB:
  35                 printf("#define KERNEL_ELFDATA ELFDATA2LSB\n");
  36                 break;
  37         case ELFDATA2MSB:
  38                 printf("#define KERNEL_ELFDATA ELFDATA2MSB\n");
  39                 break;
  40         default:
  41                 exit(1);
  42         }
  43
  44         if (sizeof(unsigned long) == 4) {
  45                 printf("#define HOST_ELFCLASS ELFCLASS32\n");
  46         } else if (sizeof(unsigned long) == 8) {
  47                 printf("#define HOST_ELFCLASS ELFCLASS64\n");
  48         }
  49
  50         endian_test.s = 0x0102;
  51         if (memcmp(endian_test.c, "\x01\x02", 2) == 0)
  52                 printf("#define HOST_ELFDATA ELFDATA2MSB\n");
  53         else if (memcmp(endian_test.c, "\x02\x01", 2) == 0)
  54                 printf("#define HOST_ELFDATA ELFDATA2LSB\n");
  55         else
  56                 exit(1);
  57
  58         if ((strcmp(argv[1], "h8300") == 0)
  59             || (strcmp(argv[1], "blackfin") == 0))
  60                 printf("#define MODULE_SYMBOL_PREFIX \"_\"\n");
  61         else
  62                 printf("#define MODULE_SYMBOL_PREFIX \"\"\n");
  63
  64         return 0;
  65 }
  66