/*
* 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));
}
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);
}