blob: 639bca7ba559198f4b3013e72556e0e24ba557c6 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001#include <stdio.h>
2#include <stdlib.h>
3#include <string.h>
4#include <elf.h>
5
6int
7main(int argc, char **argv)
8{
Sam Ravnborg62070fa2006-03-03 16:46:04 +01009 unsigned char ei[EI_NIDENT];
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 union { short s; char c[2]; } endian_test;
11
Linus Torvalds1da177e2005-04-16 15:20:36 -070012 if (fread(ei, 1, EI_NIDENT, stdin) != EI_NIDENT) {
13 fprintf(stderr, "Error: input truncated\n");
14 return 1;
15 }
16 if (memcmp(ei, ELFMAG, SELFMAG) != 0) {
17 fprintf(stderr, "Error: not ELF\n");
18 return 1;
19 }
20 switch (ei[EI_CLASS]) {
21 case ELFCLASS32:
22 printf("#define KERNEL_ELFCLASS ELFCLASS32\n");
23 break;
24 case ELFCLASS64:
25 printf("#define KERNEL_ELFCLASS ELFCLASS64\n");
26 break;
27 default:
Sam Ravnborg6803dc02006-06-24 23:46:54 +020028 exit(1);
Linus Torvalds1da177e2005-04-16 15:20:36 -070029 }
30 switch (ei[EI_DATA]) {
31 case ELFDATA2LSB:
32 printf("#define KERNEL_ELFDATA ELFDATA2LSB\n");
33 break;
34 case ELFDATA2MSB:
35 printf("#define KERNEL_ELFDATA ELFDATA2MSB\n");
36 break;
37 default:
Sam Ravnborg6803dc02006-06-24 23:46:54 +020038 exit(1);
Linus Torvalds1da177e2005-04-16 15:20:36 -070039 }
40
41 if (sizeof(unsigned long) == 4) {
42 printf("#define HOST_ELFCLASS ELFCLASS32\n");
43 } else if (sizeof(unsigned long) == 8) {
44 printf("#define HOST_ELFCLASS ELFCLASS64\n");
45 }
46
47 endian_test.s = 0x0102;
48 if (memcmp(endian_test.c, "\x01\x02", 2) == 0)
49 printf("#define HOST_ELFDATA ELFDATA2MSB\n");
50 else if (memcmp(endian_test.c, "\x02\x01", 2) == 0)
51 printf("#define HOST_ELFDATA ELFDATA2LSB\n");
52 else
Sam Ravnborg6803dc02006-06-24 23:46:54 +020053 exit(1);
Linus Torvalds1da177e2005-04-16 15:20:36 -070054
Linus Torvalds1da177e2005-04-16 15:20:36 -070055 return 0;
56}
57