yesterday on powerpc broke overnight. Apparently adding one more
function before the call to dlsym() fixes things again. I hope
I don't have to add another one tomorrow ....
libgcc_s's __register_frame_info gets called from libc's CSU code before
the libc constructors are run. __register_frame_info in turn calls
pthread_mutex_lock. libpthread is not initialised at this point and
therefore pthread__self() traps when deferencing the thread register.
This worked before because the garbage from pthread__self() is
effectively ignored.
function call instead of a call through a function pointer.
Apparently powerpc ld.elf_so gets __hackish_return_address() wrong
if the call is done through a function pointer (digging deeper into
that stuff is beyond my interest).
Thanks to riz for providing access to a macppc for debugging.
Unthanks to the broken toolchain in the default installation which
wasted approximately 4 hours of time last night.
on all platforms except VAX and IA64. Add fast access via register for
AMD64, i386 and SH3 ports. Use this fast access in libpthread to replace
the stack based pthread_self(). Implement skeleton support for Alpha,
HPPA, PowerPC, SPARC and SPARC64, but leave it disabled.
Ports that support this feature provide __HAVE____LWP_GETPRIVATE_FAST in
machine/types.h and a corresponding __lwp_getprivate_fast in
machine/mcontext.h.
This material is based upon work partially supported by
The NetBSD Foundation under a contract with Joerg Sonnenberger.
module which is compiled -fno-optimize-sibling-calls instead of
trying to fool the optimizer in various ways in the trampoline.
thanks to yamt for the tip
for weak references. GCC 4.2+ and Clang require static, older GCC wants
extern. Change __weak_reference to include sym. This requires changes
the existing users to not reuse the name of the symbol, but avoids
further differences between GCC 4.1 and GCC 4.2+/clang.
open for the fd. Prevents collision with rumphijack.
Also, prevent potential hyperspace memory access.
Does someone want to write tests for this facility?
be hijacked. If it's not specified, the default is
"path=/rump,socket=all:nolocal".
So, if you're moof and want to relive your domain/os days (??),
you can do this:
pain-rustique:51:~> setenv RUMPHIJACK 'path=//'
pain-rustique:52:~> df //dev
Filesystem 1K-blocks Used Avail %Cap Mounted on
rumpfs 1 1 0 100% /
pain-rustique:53:~> df /dev
Filesystem 1K-blocks Used Avail %Cap Mounted on
/dev/wd0a 1019864 280640 688232 28% /
where you can mount a file system with a userspace server *without*
it having to go through puffs.
Say, you first start a server with ffs capability and map a host
ffs image into it:
rump_server -lrumpvfs -lrumpfs_ffs \
-d key=/ffsimg,hostpath=ffs2.img,size=e unix:///tmp/ffsserv
Then, configure your shell to talk to the rump server:
setenv RUMP_SERVER unix:///tmp/ffsserv
setenv LD_PRELOAD /usr/lib/librumphijack.so
Create a mountpoint and mount the file system:
pain-rustique:60:~> sh
$ cd /rump
$ ls
dev
$ ls -l
total 1
drwxr-xr-x 2 root wheel 512 Feb 17 18:00 dev
$ mkdir mnt
$ mount_ffs /ffsimg /rump/mnt
mount_ffs: Warning: realpath /ffsimg: No such file or directory
$ df -h mnt
Filesystem Size Used Avail %Cap Mounted on
/ffsimg 496M 380M 91M 80% /mnt
$ du -sckh *
192K dev
380M mnt
381M total
$ umount -R mnt
$ df -h mnt
Filesystem Size Used Avail %Cap Mounted on
rumpfs 1.0K 1.0K 0B 100% /
$
(note, you need -R to umount due to various degrees of unsuccesful
magic it attempts to perform without it)
