static void parse_elf()

in boot/compressed/misc.c [233:279]

• 40 lines of code
• 8 McCabe index (conditional complexity)

static void parse_elf(void *output)
{
#ifdef CONFIG_64BIT
	Elf64_Ehdr ehdr;
	Elf64_Phdr *phdrs, *phdr;
#else
	Elf32_Ehdr ehdr;
	Elf32_Phdr *phdrs, *phdr;
#endif
	void *dest;
	int i;

	memcpy(&ehdr, output, sizeof(ehdr));
	if (ehdr.e_ident[EI_MAG0] != ELFMAG0 ||
	   ehdr.e_ident[EI_MAG1] != ELFMAG1 ||
	   ehdr.e_ident[EI_MAG2] != ELFMAG2 ||
	   ehdr.e_ident[EI_MAG3] != ELFMAG3) {
		error("Kernel is not a valid ELF file");
		return;
	}

#ifdef DEBUG
	printf("Parsing ELF... ");
#endif

	phdrs = malloc(sizeof(*phdrs) * ehdr.e_phnum);
	if (!phdrs)
		error("Failed to allocate space for phdrs");

	memcpy(phdrs, output + ehdr.e_phoff, sizeof(*phdrs) * ehdr.e_phnum);

	for (i = 0; i < ehdr.e_phnum; i++) {
		phdr = &phdrs[i];

		switch (phdr->p_type) {
		case PT_LOAD:
			dest = (void *)((unsigned long) phdr->p_paddr &
					(__PAGE_OFFSET_DEFAULT-1));
			memmove(dest, output + phdr->p_offset, phdr->p_filesz);
			break;
		default:
			break;
		}
	}

	free(phdrs);
}