コード例 #1
0
ファイル: a2coff.c プロジェクト: orumin/openbsd-efivars
/*
 * Convert an ELF binary into BCS ECOFF format.
 * We merge all program headers into a single ECOFF section for simplicity.
 * However, PROM version 01.14 on AV4300 will fail to load a BCS binary
 * unless it has a non-empty data section, so we put the smallest possible
 * bunch of zeroes as a second section to appease it.
 */
void
convert_elf(const char *infile, int infd, int outfd, Elf_Ehdr *ehdr)
{
	struct ecoff_exechdr ehead;
	struct ecoff_scnhdr escn[2];
	Elf_Phdr *phdr;
	off_t outpos;
	uint delta, ptload;
	Elf_Addr minaddr, maxaddr;
	int n, last;

	phdr = calloc(ehdr->e_phnum, sizeof(Elf_Phdr));
	if (phdr == NULL)
		err(1, "calloc");

	for (n = 0; n < ehdr->e_phnum; n++) {
		if (lseek(infd, ehdr->e_phoff + n * ehdr->e_phentsize,
		    SEEK_SET) == (off_t) -1)
			err(1, "seek");
		if (read(infd, phdr + n, sizeof *phdr) != sizeof(*phdr))
			err(1, "read");
	}

	ptload = 0;
	for (n = 0; n < ehdr->e_phnum; n++)
		if (phdr[n].p_type == PT_LOAD)
			ptload++;
	if (ptload > 3)
		errx(1, "%s: too many PT_LOAD program headers", infile);

	maxaddr = 0;
	minaddr = (Elf_Addr)-1;

	for (n = 0; n < ehdr->e_phnum; n++) {
		if (phdr[n].p_type != PT_LOAD)
			continue;
		if (phdr[n].p_paddr < minaddr)
			minaddr = phdr[n].p_paddr;
		if (phdr[n].p_paddr + phdr[n].p_memsz > maxaddr)
			maxaddr = phdr[n].p_paddr + phdr[n].p_memsz;
	}
	maxaddr = round(maxaddr, MINIMAL_ALIGN);

	/*
	 * Header
	 */

	memset(&ehead, 0, sizeof ehead);
	memset(&escn, 0, sizeof escn);

	ehead.f.f_magic = 0x016d;		/* MC88OMAGIC */
	ehead.f.f_nscns = 2;
	ehead.f.f_opthdr = sizeof ehead.a;
	ehead.f.f_flags = 0x020f;
		/* F_RELFLG | F_EXEC | F_LNNO | 8 | F_AR16WR */

	ehead.a.magic = ZMAGIC;
	ehead.a.tsize = maxaddr - minaddr;			/* ignored */
	ehead.a.dsize = MINIMAL_ALIGN;				/* ignored */
	ehead.a.bsize = 0;					/* ignored */
	ehead.a.entry = ehdr->e_entry;
	ehead.a.text_start = minaddr;				/* ignored */
	ehead.a.data_start = maxaddr;				/* ignored */

	n = write(outfd, &ehead, sizeof(ehead));
	if (n != sizeof(ehead))
		err(1, "write");

	/*
	 * Sections
	 */

	strncpy(escn[0].s_name, ".text", sizeof escn[0].s_name);
	escn[0].s_paddr = minaddr;		/* ignored, 1:1 mapping */
	escn[0].s_size = maxaddr - minaddr;
	escn[0].s_scnptr = round(sizeof(ehead) + sizeof(escn), MINIMAL_ALIGN);
	escn[0].s_flags = 0x20;	/* STYP_TEXT */

	strncpy(escn[1].s_name, ".data", sizeof escn[1].s_name);
	escn[1].s_paddr = escn[0].s_paddr + escn[0].s_size;
	escn[1].s_size = MINIMAL_ALIGN;
	escn[1].s_scnptr = escn[0].s_scnptr + escn[0].s_size;
	escn[1].s_flags = 0x40;	/* STYP_DATA */

	/* adjust load addresses */
	escn[0].s_vaddr = escn[0].s_paddr;
	escn[1].s_vaddr = escn[1].s_paddr;

	n = write(outfd, &escn, sizeof(escn));
	if (n != sizeof(escn))
		err(1, "write");

	/*
	 * Copy ``text'' section (all PT_LOAD program headers).
	 */

	outpos = escn[0].s_scnptr;
	if (lseek(outfd, outpos, SEEK_SET) == (off_t) -1)
		err(1, "seek");
	for (n = 0, last = -1; n < ehdr->e_phnum; n++) {
		if (phdr[n].p_type != PT_LOAD)
			continue;
		if (last >= 0) {
			delta = (phdr[n].p_paddr - phdr[last].p_paddr) -
			    phdr[last].p_memsz;
			if (delta != 0) {
				zerobits(outfd, delta);
				outpos += delta;
			}
		}
#ifdef DEBUG
		printf("copying %s: source %x dest %llx size %x\n",
		    escn[0].s_name, phdr[n].p_offset, outpos, phdr[n].p_filesz);
#endif
		if (lseek(infd, phdr[n].p_offset, SEEK_SET) == (off_t) -1)
			err(1, "seek");
		copybits(infd, outfd, phdr[n].p_filesz);
		delta = phdr[n].p_memsz - phdr[n].p_filesz;
		if (delta != 0)
			zerobits(outfd, delta);
		outpos += phdr[n].p_memsz;
		last = n;
	}

	free(phdr);

	/*
	 * Fill ``data'' section.
	 */

	zerobits(outfd, escn[1].s_size);
	outpos += escn[1].s_size;

	/*
	 * Round file to a multiple of 512 bytes, since ``recent'' PROM
	 * (such as rev 1.20 on AV530) will reject files not being properly
	 * rounded to a multiple of 512 bytes.
	 */

	if ((outpos % ECOFF_ALIGN) != 0)
		zerobits(outfd, ECOFF_ALIGN - (outpos % ECOFF_ALIGN));
}
コード例 #2
0
ファイル: a2coff.c プロジェクト: alenichev/openbsd-kernel
int
main(int argc, char *argv[])
{
	struct exec head;
	struct ecoff_exechdr ehead;
	struct ecoff_scnhdr escn[3];
	int infd, outfd;
	int n;

	if (argc != 3)
		usage();

	infd = open(argv[1], O_RDONLY);
	if (infd < 0)
		err(1, argv[1]);

	outfd = open(argv[2], O_WRONLY | O_TRUNC | O_CREAT, 0644);
	if (outfd < 0)
		err(1, argv[2]);

	n = read(infd, &head, sizeof(head));
	if (n < sizeof(head))
		err(1, "read");

	if (N_BADMAG(head)) {
		printf("%s: bad magic number\n", argv[1]);
		exit(1);
	}

	if (head.a_trsize || head.a_drsize) {
		printf("%s: has relocations\n", argv[1]);
		exit(1);
	}

	/*
	 * Header
	 */

	ehead.f.f_magic = 0x016d;		/* MC88OMAGIC */
	ehead.f.f_nscns = 3;
	ehead.f.f_timdat = 0;			/* ignored */
	ehead.f.f_symptr = 0;			/* ignored */
	ehead.f.f_nsyms = 0;			/* ignored */
	ehead.f.f_opthdr = sizeof ehead.a;
	ehead.f.f_flags = 0x020f;
		/* F_RELFLG | F_EXEC | F_LNNO | 8 | F_AR16WR */

	ehead.a.magic = N_GETMAGIC(head);
	ehead.a.vstamp = 0;			/* ignored */
	ehead.a.tsize = head.a_text;		/* ignored */
	ehead.a.dsize = head.a_data;		/* ignored */
	ehead.a.bsize = head.a_bss;		/* ignored */
	ehead.a.entry = head.a_entry;
	ehead.a.text_start = N_TXTADDR(head);	/* ignored */
	ehead.a.data_start = N_DATADDR(head);	/* ignored */

	n = write(outfd, &ehead, sizeof(ehead));
	if (n != sizeof(ehead))
		err(1, "write");

	/*
	 * Sections.
	 * Note that we merge .bss into .data since the PROM will not
	 * clear it and locore does not do this either.
	 */

	strncpy(escn[0].s_name, ".text", sizeof escn[0].s_name);
	escn[0].s_paddr = N_TXTADDR(head);	/* ignored, 1:1 mapping */
	escn[0].s_size = round(head.a_text, 8);
	escn[0].s_scnptr = round(sizeof(ehead) + sizeof(escn), 0x10);
	escn[0].s_relptr = 0;
	escn[0].s_lnnoptr = 0;
	escn[0].s_nlnno = 0;
	escn[0].s_flags = 0x20;	/* STYP_TEXT */

	strncpy(escn[1].s_name, ".data", sizeof escn[1].s_name);
	escn[1].s_paddr = N_DATADDR(head);		/* ignored, 1:1 mapping */
	escn[1].s_scnptr = escn[0].s_scnptr + escn[0].s_size;
	escn[1].s_size = round(head.a_data + head.a_bss, 8);
	escn[1].s_relptr = 0;
	escn[1].s_lnnoptr = 0;
	escn[1].s_nlnno = 0;
	escn[1].s_flags = 0x40;	/* STYP_DATA */

	strncpy(escn[2].s_name, ".bss", sizeof escn[2].s_name);
	escn[2].s_paddr = N_BSSADDR(head) + head.a_bss;	/* ignored, 1:1 mapping */
	escn[2].s_scnptr = 0;		/* nothing in the file */
	escn[2].s_size = 0;
	escn[2].s_relptr = 0;
	escn[2].s_lnnoptr = 0;
	escn[2].s_nlnno = 0;
	escn[2].s_flags = 0x80;	/* STYP_BSS */

	/* adjust load addresses */
	escn[0].s_paddr += (head.a_entry & ~(__LDPGSZ - 1)) - __LDPGSZ;
	escn[1].s_paddr += (head.a_entry & ~(__LDPGSZ - 1)) - __LDPGSZ;
	escn[2].s_paddr += (head.a_entry & ~(__LDPGSZ - 1)) - __LDPGSZ;
	escn[0].s_vaddr = escn[0].s_paddr;
	escn[1].s_vaddr = escn[1].s_paddr;
	escn[2].s_vaddr = escn[2].s_paddr;

	n = write(outfd, &escn, sizeof(escn));
	if (n != sizeof(escn))
		err(1, "write");

	/*
	 * Copy text section
	 */

#ifdef DEBUG
	printf("copying %s: source %lx dest %lx size %x\n",
	    escn[0].s_name, N_TXTOFF(head), escn[0].s_scnptr, head.a_text);
#endif
	lseek(outfd, escn[0].s_scnptr, SEEK_SET);
	lseek(infd, N_TXTOFF(head), SEEK_SET);
	copybits(infd, outfd, head.a_text);

	/*
	 * Copy data section
	 */

#ifdef DEBUG
	printf("copying %s: source %lx dest %lx size %x\n",
	    escn[1].s_name, N_DATOFF(head), escn[1].s_scnptr, head.a_data);
#endif
	lseek(outfd, escn[1].s_scnptr, SEEK_SET);
	lseek(infd, N_DATOFF(head), SEEK_SET);
	copybits(infd, outfd, head.a_data);

	/*
	 * ``Copy'' bss section
	 */

#ifdef DEBUG
	printf("copying %s: size %lx\n",
	    escn[2].s_name, round(head.a_data + head.a_bss, 8) - head.a_data);
#endif
	zerobits(outfd, round(head.a_data + head.a_bss, 8) - head.a_data);

	close(infd);
	close(outfd);
	exit(0);
}