root/scripts/mod/mk_elfconfig.c

DEFINITIONS

1. main

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <elf.h>

int
main(int argc, char **argv)
{
        unsigned char ei[EI_NIDENT];
        union { short s; char c[2]; } endian_test;

        if (fread(ei, 1, EI_NIDENT, stdin) != EI_NIDENT) {
                fprintf(stderr, "Error: input truncated\n");
                return 1;
        }
        if (memcmp(ei, ELFMAG, SELFMAG) != 0) {
                fprintf(stderr, "Error: not ELF\n");
                return 1;
        }
        switch (ei[EI_CLASS]) {
        case ELFCLASS32:
                printf("#define KERNEL_ELFCLASS ELFCLASS32\n");
                break;
        case ELFCLASS64:
                printf("#define KERNEL_ELFCLASS ELFCLASS64\n");
                break;
        default:
                exit(1);
        }
        switch (ei[EI_DATA]) {
        case ELFDATA2LSB:
                printf("#define KERNEL_ELFDATA ELFDATA2LSB\n");
                break;
        case ELFDATA2MSB:
                printf("#define KERNEL_ELFDATA ELFDATA2MSB\n");
                break;
        default:
                exit(1);
        }

        if (sizeof(unsigned long) == 4) {
                printf("#define HOST_ELFCLASS ELFCLASS32\n");
        } else if (sizeof(unsigned long) == 8) {
                printf("#define HOST_ELFCLASS ELFCLASS64\n");
        }

        endian_test.s = 0x0102;
        if (memcmp(endian_test.c, "\x01\x02", 2) == 0)
                printf("#define HOST_ELFDATA ELFDATA2MSB\n");
        else if (memcmp(endian_test.c, "\x02\x01", 2) == 0)
                printf("#define HOST_ELFDATA ELFDATA2LSB\n");
        else
                exit(1);

        return 0;
}