cregit-Linux how code gets into the kernel

Release 4.10 scripts/mod/mk_elfconfig.c

Directory: scripts/mod
#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; }


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Directory: scripts/mod
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