Re: amd64 kernel, i386 userland

[Emmanuel Dreyfus <manu%netbsd.org@localhost>]

Hi

Any objections remaining against this being committed?

On Sat, Jan 25, 2014 at 05:18:16PM +0100, Emmanuel Dreyfus wrote:
> Index: sys/kern/kern_exec.c
> ===================================================================
> RCS file: /cvsroot/src/sys/kern/kern_exec.c,v
> retrieving revision 1.369
> diff -U 4 -r1.369 kern_exec.c
> --- sys/kern/kern_exec.c        3 Jan 2014 15:49:49 -0000       1.369
> +++ sys/kern/kern_exec.c        25 Jan 2014 16:13:13 -0000
> @@ -177,9 +177,13 @@
>  
>  /* NetBSD emul struct */
>  struct emul emul_netbsd = {
>         .e_name =               "netbsd",
> +#ifdef EMUL_NATIVEROOT
> +       .e_path =               EMUL_NATIVEROOT,
> +#else
>         .e_path =               NULL,
> +#endif
>  #ifndef __HAVE_MINIMAL_EMUL
>         .e_flags =              EMUL_HAS_SYS___syscall,
>         .e_errno =              NULL,
>         .e_nosys =              SYS_syscall,
> Index: share/man/man4/options.4
> ===================================================================
> RCS file: /cvsroot/src/share/man/man4/options.4,v
> retrieving revision 1.432
> diff -U 4 -r1.432 options.4
> --- share/man/man4/options.4    13 Oct 2013 22:34:13 -0000      1.432
> +++ share/man/man4/options.4    25 Jan 2014 16:13:13 -0000
> @@ -449,8 +449,23 @@
>  .Va struct stat
>  are adjusted and some binaries which use
>  .Xr sysctl 3
>  to retrieve network details would not work properly.
> +.It Cd options EMUL_NATIVEROOT=string
> +Just like emulated binaries first try to lookup files in 
> +an emulation root (e.g.:
> +.Pa /emul/linux )
> +before looking them up in real root, this option cause native
> +binaries to first look up files in an "emulation" directory too.
> +This can be useful to test an amd64 kernel on top of an i386 system
> +prior full migration: by unpacking the amd64 distribution in e.g.
> +.Pa /emul/netbsd64 
> +and specifying that location as
> +.Cd EMUL_NATIVEROOT ,
> +native amd64 binaries can be run while the root filesystem remains
> +populated with i386 binaries. Beware of 
> +.Pa /dev
> +incompatibilities between i386 and amd64 if you do this.
>  .It Cd options EXEC_ELF_NOTELESS
>  Run unidentified ELF binaries as
>  .Nx
>  binaries.
> 
> -- 
> Emmanuel Dreyfus
> http://hcpnet.free.fr/pubz
> manu%netbsd.org@localhost

-- 
Emmanuel Dreyfus
manu%netbsd.org@localhost