mk_elfconfig.c

 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
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
31	return 0;
32}