1 // SPDX-License-Identifier: GPL-2.0
2 #include <stdio.h>
3 #include <stdlib.h>
4 #include <string.h>
5 #include <elf.h>
6
7 int
8 main(int argc, char **argv)
9 {
10 unsigned char ei[EI_NIDENT];
11 union { short s; char c[2]; } endian_test;
12
13 if (fread(ei, 1, EI_NIDENT, stdin) != EI_NIDENT) {
14 fprintf(stderr, "Error: input truncated\n");
15 return 1;
16 }
17 if (memcmp(ei, ELFMAG, SELFMAG) != 0) {
18 fprintf(stderr, "Error: not ELF\n");
19 return 1;
20 }
21 switch (ei[EI_CLASS]) {
22 case ELFCLASS32:
23 printf("#define KERNEL_ELFCLASS ELFCLASS32\n");
24 break;
25 case ELFCLASS64:
26 printf("#define KERNEL_ELFCLASS ELFCLASS64\n");
27 break;
28 default:
29 exit(1);
30 }
31 switch (ei[EI_DATA]) {
32 case ELFDATA2LSB:
33 printf("#define KERNEL_ELFDATA ELFDATA2LSB\n");
34 break;
35 case ELFDATA2MSB:
36 printf("#define KERNEL_ELFDATA ELFDATA2MSB\n");
37 break;
38 default:
39 exit(1);
40 }
41
42 if (sizeof(unsigned long) == 4) {
43 printf("#define HOST_ELFCLASS ELFCLASS32\n");
44 } else if (sizeof(unsigned long) == 8) {
45 printf("#define HOST_ELFCLASS ELFCLASS64\n");
46 }
47
48 endian_test.s = 0x0102;
49 if (memcmp(endian_test.c, "\x01\x02", 2) == 0)
50 printf("#define HOST_ELFDATA ELFDATA2MSB\n");
51 else if (memcmp(endian_test.c, "\x02\x01", 2) == 0)
52 printf("#define HOST_ELFDATA ELFDATA2LSB\n");
53 else
54 exit(1);
55
56 return 0;
57 }
58
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