1#include <stdio.h>
 2#include <stdlib.h>
 3#include <string.h>
 4#include <elf.h>
 5
 6int
 7main(int argc, char **argv)
 8{
 9	unsigned char ei[EI_NIDENT];
10	union { short s; char c[2]; } endian_test;
11
12	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:
28		exit(1);
29	}
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:
38		exit(1);
39	}
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
53		exit(1);
54
55	return 0;
56}

 1// SPDX-License-Identifier: GPL-2.0
 2#include <stdio.h>
 3#include <stdlib.h>
 4#include <string.h>
 5#include <elf.h>
 6
 7int
 8main(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}