HelenOS sources

EI_DATA            90 boot/generic/src/kernel.c 	if (header->e_ident[EI_DATA] != ELF_DATA_ENCODING ||
EI_DATA            73 kernel/generic/src/lib/elf.c 	if ((header->e_ident[EI_DATA] != ELF_DATA_ENCODING) ||
EI_DATA           153 uspace/app/taskdump/elf_core.c 	elf_hdr.e_ident[EI_DATA] = ELF_DATA_ENCODING;
EI_DATA            53 uspace/lib/c/generic/elf/elf.c 	if (header->e_ident[EI_DATA] != ELF_DATA_ENCODING ||
EI_DATA           155 uspace/lib/c/generic/elf/elf_mod.c 	if (header->e_ident[EI_DATA] != ELF_DATA_ENCODING ||
HelenOS homepage, sources at GitHub