Function write_elf

util/cbfstool/rmodule.c:497–669

}

static int
write_elf(const struct rmod_context *ctx, const struct buffer *in,
	  struct buffer *out)
{
	int ret;
	int bit64;
	size_t loc;
	size_t rmod_data_size;
	struct elf_writer *ew;
	struct buffer rmod_data;
	struct buffer rmod_header;
	struct buffer program;
	struct buffer relocs;
	Elf64_Xword total_size;
	Elf64_Addr addr;
	Elf64_Ehdr ehdr;

	if (ctx->nsegments != 1) {
		ERROR("Multiple loadable segments is not supported.\n");
		return -1;
	}

	bit64 = ctx->pelf.ehdr.e_ident[EI_CLASS] == ELFCLASS64;

	/*
	 * 3 sections will be added  to the ELF file.
	 * +------------------+
	 * |  rmodule header  |
	 * +------------------+
	 * |     program      |
	 * +------------------+
	 * |   relocations    |
	 * +------------------+
	 */

	/* Create buffer for header and relocations. */
	rmod_data_size = sizeof(struct rmodule_header);
	if (bit64)
		rmod_data_size += ctx->nrelocs * sizeof(Elf64_Addr);
	else
		rmod_data_size += ctx->nrelocs * sizeof(Elf32_Addr);

	if (buffer_create(&rmod_data, rmod_data_size, "rmod"))
		return -1;

	buffer_splice(&rmod_header, &rmod_data,
	              0, sizeof(struct rmodule_header));
	buffer_clone(&relocs, &rmod_data);
	buffer_seek(&relocs, sizeof(struct rmodule_header));

	/* Reset current location. */
	buffer_set_size(&rmod_header, 0);
	buffer_set_size(&relocs, 0);

	/* Program contents. */
	buffer_splice(&program, in, ctx->phdr->p_offset, ctx->phdr->p_filesz);

	/* Create ELF writer. Set entry point to 0 to match section offsets. */