Function link_elf_link_preload

freebsd/kern/link_elf_obj.c:323–597

}

static int
link_elf_link_preload(linker_class_t cls, const char *filename,
    linker_file_t *result)
{
	Elf_Ehdr *hdr;
	Elf_Shdr *shdr;
	Elf_Sym *es;
	void *modptr, *baseptr, *sizeptr;
	char *type;
	elf_file_t ef;
	linker_file_t lf;
	Elf_Addr off;
	int error, i, j, pb, ra, rl, shstrindex, symstrindex, symtabindex;

	/* Look to see if we have the file preloaded */
	modptr = preload_search_by_name(filename);
	if (modptr == NULL)
		return ENOENT;

	type = (char *)preload_search_info(modptr, MODINFO_TYPE);
	baseptr = preload_search_info(modptr, MODINFO_ADDR);
	sizeptr = preload_search_info(modptr, MODINFO_SIZE);
	hdr = (Elf_Ehdr *)preload_search_info(modptr, MODINFO_METADATA |
	    MODINFOMD_ELFHDR);
	shdr = (Elf_Shdr *)preload_search_info(modptr, MODINFO_METADATA |
	    MODINFOMD_SHDR);
	if (type == NULL || (strcmp(type, "elf" __XSTRING(__ELF_WORD_SIZE)
	    " obj module") != 0 &&
	    strcmp(type, "elf obj module") != 0)) {
		return (EFTYPE);
	}
	if (baseptr == NULL || sizeptr == NULL || hdr == NULL ||
	    shdr == NULL)
		return (EINVAL);

	lf = linker_make_file(filename, &link_elf_class);
	if (lf == NULL)
		return (ENOMEM);

	ef = (elf_file_t)lf;
	ef->preloaded = 1;
	ef->address = *(caddr_t *)baseptr;
	lf->address = *(caddr_t *)baseptr;
	lf->size = *(size_t *)sizeptr;

	if (hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS ||
	    hdr->e_ident[EI_DATA] != ELF_TARG_DATA ||
	    hdr->e_ident[EI_VERSION] != EV_CURRENT ||
	    hdr->e_version != EV_CURRENT ||
	    hdr->e_type != ET_REL ||
	    hdr->e_machine != ELF_TARG_MACH) {
		error = EFTYPE;
		goto out;
	}
	ef->e_shdr = shdr;

	/* Scan the section header for information and table sizing. */
	symtabindex = -1;