Function link_elf_init

freebsd/kern/link_elf.c:416–497

	&kern_relbase, 0, "Kernel relocated base address");

static void
link_elf_init(void* arg)
{
	Elf_Dyn *dp;
	Elf_Addr *ctors_addrp;
	Elf_Size *ctors_sizep;
	caddr_t modptr, baseptr, sizeptr;
	elf_file_t ef;
	const char *modname;

	linker_add_class(&link_elf_class);

	dp = (Elf_Dyn *)&_DYNAMIC;
	modname = NULL;
	modptr = preload_search_by_type("elf" __XSTRING(__ELF_WORD_SIZE) " kernel");
	if (modptr == NULL)
		modptr = preload_search_by_type("elf kernel");
	modname = (char *)preload_search_info(modptr, MODINFO_NAME);
	if (modname == NULL)
		modname = "kernel";
	linker_kernel_file = linker_make_file(modname, &link_elf_class);
	if (linker_kernel_file == NULL)
		panic("%s: Can't create linker structures for kernel",
		    __func__);

	ef = (elf_file_t) linker_kernel_file;
	ef->preloaded = 1;
#ifdef RELOCATABLE_KERNEL
	/* Compute relative displacement */
	ef->address = (caddr_t) (__startkernel - KERNBASE);
#else
	ef->address = 0;
#endif
#ifdef SPARSE_MAPPING
	ef->object = NULL;
#endif
	ef->dynamic = dp;

	if (dp != NULL)
		parse_dynamic(ef);
#ifdef RELOCATABLE_KERNEL
	linker_kernel_file->address = (caddr_t)__startkernel;
	linker_kernel_file->size = (intptr_t)(__endkernel - __startkernel);
	kern_relbase = (unsigned long)__startkernel;
#else
	linker_kernel_file->address += KERNBASE;
	linker_kernel_file->size = -(intptr_t)linker_kernel_file->address;
#endif

	if (modptr != NULL) {
		ef->modptr = modptr;
		baseptr = preload_search_info(modptr, MODINFO_ADDR);
		if (baseptr != NULL)
			linker_kernel_file->address = *(caddr_t *)baseptr;
		sizeptr = preload_search_info(modptr, MODINFO_SIZE);
		if (sizeptr != NULL)
			linker_kernel_file->size = *(size_t *)sizeptr;
		ctors_addrp = (Elf_Addr *)preload_search_info(modptr,