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https://github.com/torvalds/linux.git
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57 lines
1.2 KiB
C
57 lines
1.2 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <elf.h>
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int
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main(int argc, char **argv)
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{
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unsigned char ei[EI_NIDENT];
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union { short s; char c[2]; } endian_test;
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if (fread(ei, 1, EI_NIDENT, stdin) != EI_NIDENT) {
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fprintf(stderr, "Error: input truncated\n");
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return 1;
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}
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if (memcmp(ei, ELFMAG, SELFMAG) != 0) {
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fprintf(stderr, "Error: not ELF\n");
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return 1;
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}
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switch (ei[EI_CLASS]) {
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case ELFCLASS32:
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printf("#define KERNEL_ELFCLASS ELFCLASS32\n");
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break;
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case ELFCLASS64:
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printf("#define KERNEL_ELFCLASS ELFCLASS64\n");
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break;
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default:
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exit(1);
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}
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switch (ei[EI_DATA]) {
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case ELFDATA2LSB:
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printf("#define KERNEL_ELFDATA ELFDATA2LSB\n");
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break;
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case ELFDATA2MSB:
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printf("#define KERNEL_ELFDATA ELFDATA2MSB\n");
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break;
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default:
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exit(1);
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}
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if (sizeof(unsigned long) == 4) {
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printf("#define HOST_ELFCLASS ELFCLASS32\n");
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} else if (sizeof(unsigned long) == 8) {
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printf("#define HOST_ELFCLASS ELFCLASS64\n");
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}
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endian_test.s = 0x0102;
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if (memcmp(endian_test.c, "\x01\x02", 2) == 0)
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printf("#define HOST_ELFDATA ELFDATA2MSB\n");
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else if (memcmp(endian_test.c, "\x02\x01", 2) == 0)
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printf("#define HOST_ELFDATA ELFDATA2LSB\n");
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else
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exit(1);
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return 0;
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}
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