> > On a related note, I don't know if people use xanim, a movie viewer in
> > the ports collection, but it's recently been upgraded to support
> > dynamically loadable codecs. The problem is that none of the codecs
> > are compiled for FreeBSD, although there are three Linux versions :-).
> > To use them (really to use the program at all) you have to compile a
> > Linux version of xanim and run under emulation (which works really well,
> > thanks
> > emulation guys!).
> >
> > Yes, I've tried using the Linux codecs on the FreeBSD binary. No dice.
> >
> > The author is perfectly willing to compile these codecs for FreeBSD,
> > but because he's under NDA for the codecs he can only release compiled
> > versions. He's only willing to compile versions for other OSes under
> > Linux (i.e. compile the codecs for FreeBSD on his Linux machine) or on
> > a donated machine. (His reasoning for this, which IMHO is rational,
> > is on http://xanim.va.pubnix.com/xa_dlls.html )
> >
> > Given that he's running Linux, is a "cross-compiling environment" any
> > more complex than having him link against our libc? If not can
> > someone give me an idea what he does need.
> >
> > I'm delighted to act as a contact point and a tester for the xanim
> > author, but I just don't know enough about our link environment.
> >
> > Anyone want to enlighten me? (I tried this on multimedia, and got no
> > response).
> >
> > - ----------------------------------------------------------------------
> > Ted Faber [email protected]
> > USC/ISI Computer Scientist http://www.isi.edu/~faber
> > (310) 822-1511 x190 PGP Key: http://www.isi.edu/~faber/pubkey.asc
> >
> The only reason some of the linux codecs are not useable on FreeBSD is
> the reference of symbol __IO_stderr, it should be quite easy to convert
> them to references to &__sF[2].
>
> -lq
>
Compile this little program, use it to process the linux .xa files, and they
should be useable on FreeBSD.
-lq
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <stdio.h>
#include <elf.h>
#include <fcntl.h>
main(int argc, char **argv)
{
int fd, i;
void *addr;
Elf_Ehdr *eh;
Elf_Phdr *ph;
Elf_Dyn *ed;
Elf_Rel *reltab, *er;
Elf_Sym *symtab;
char *strtab, *name;
int relsz, relent;
struct stat stb;
if (argc < 2)
exit(1);
fd = open(argv[1], O_RDWR);
if (fd < 0)
err(1, "%s", argv[1]);
if (fstat(fd, &stb) < 0) {
close(fd);
err(-1, "fstat: %s", argv[1]);
}
addr = mmap(0, stb.st_size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
close(fd);
if ((int)addr == -1)
err(-1, "mmap");
eh = (Elf_Ehdr *)addr;
if (!IS_ELF(*eh))
err(1, "%s: not an ELF file", argv[1]);
ph = (Elf_Phdr *)((unsigned)addr + eh->e_phoff);
for (i = 0; i < eh->e_phnum; i++, ph++) {
if (ph->p_type == PT_DYNAMIC)
break;
}
if (i >= eh->e_phnum)
err(-1, "no dynamic section");
ed = (Elf_Dyn *)((unsigned)addr + ph->p_offset);
for (; ed->d_tag != DT_NULL; ed++) {
if (ed->d_tag == DT_STRTAB)
strtab = (char *)((unsigned)addr + ed->d_un.d_val);
if (ed->d_tag == DT_SYMTAB)
symtab = (Elf_Sym *)((unsigned)addr + ed->d_un.d_val);
if (ed->d_tag == DT_REL)
reltab = (Elf_Rel *)((unsigned)addr + ed->d_un.d_val);
if (ed->d_tag == DT_RELSZ)
relsz = ed->d_un.d_val;
if (ed->d_tag == DT_RELENT)
relent = ed->d_un.d_val;
}
for (i = 0, er = reltab; i < relsz / relent; i++, er++) {
name = &strtab[symtab[ELF_R_SYM(er->r_info)].st_name];
if (strcmp("_IO_stderr_", name))
continue;
strcpy(name, "__sF");
*(unsigned long *)((unsigned)addr + er->r_offset) +=
(unsigned)stderr - (unsigned)stdin;
}
munmap(addr, stb.st_size);
}
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