Re: COMPAT_IRIX, N32, mmap for /dev/zero.

Hi.
Actually if I understand correct, the ktrace itself is
made for the NetBSD which may not have any information
about any emulated platforms like IRIX. As I
understand there are differences between the NetBSD &
IRIX the way the syscalls work. Anyways your tip was
very helpful. Thanks.

Firstly, I think there is parameter mismatch. I found
out that the O32 binaries work propely & pass all the
parameters correct to mmap(). But the N32 binaries
don't pass correct parameters to mmap(). The trace
dump shows /dev/zero is opened correctly & acquired
the fd as 3. However its not passed to mmap().
Could anyone please help me in understanding why this
would happen??

Secondly, whether we implement, mmap() for /dev/zero
device???

Many thanks & best regards,
Girish.


--- "GIRISH V. GULAWANI" <[email protected]> wrote:
> 
> hi.
> i checked N32 binary with ktrace+kdump on the
> command
> "mipscheck". it shows the shutdown() call has failed
> &
> that it has returned error as invalid argument. now
> what i don't understand is why /dev/zero would call
> shutdown which is a socket call. 
> after enabling the DEBUG_SYSCALLS, it is confirmed
> that rld_sbrk calls mmap() for /emul/irix/dev/zero &
> since it isn't there, it calls for /dev/zero. this
> mmap() infact has failed. perhaps because, it does
> not
> have handle on zero device. another problem here is,
> the device number passed by irix_mmap() through
> arguments to sys_mmap() is 0. i'd expect it to be
> (2,12). and that is the reason the uvm_mmap() has
> failed to see correctly mmmap() implementation for
> zero device. instead it returns error, which happens
> to match, had it been the zero device handle.
> i'd like to know is how to get the device handle &
> whether we can implement mmap() in the mem.c for the
> zero device?? then how to??
> thanks.
> girish.
> 
> 
> --- "GIRISH V. GULAWANI" <[email protected]> wrote:
> > 
> > yes i understand (37,0) is not the /dev/zero,
> > instead
> > its (2,12). infact i am using the latter one only.
> 
> > i am having a standlone init, with couple of basic
> > daemons. i am able to execute any O32 command
> either
> > compiled for NetBSD or IRIX. also a N32 command
> like
> > "sh" is also getting executed. 
> > i haven't done ktrace for these binaries. thanks
> for
> > suggestion.
> > btw, i am running this on Malta board with 64MB
> RAM.
> > is this alright??
> > 
> > --- Jaromir Dolecek <[email protected]> wrote:
> > > Device (37, 0) is pms0 under NetBSD/i386, it may
> > not
> > > be even
> > > assigned under sgimips. Thus, the
> > > /emul/irix/dev/zero device
> > > you created was most definitely not okay; if you
> > > really feel
> > > you need it, it should be softlinked to NetBSD
> > > /dev/zero.
> > > 
> > > Are your process limits bumped high enough? What
> > > does
> > > ktrace of the binary reveal?
> > > 
> > > GIRISH V. GULAWANI wrote:
> > > > 
> > > > Hello, all.
> > > > After adding COMPAT_IRIX option to the kernel
> I
> > am
> > > > able to bring up the shell "sh" of IRIX 6.3,
> > which
> > > I
> > > > suppose is N32 type. Some other commands
> > basically
> > > O32
> > > > are also okay. However commands like elfdump,
> > > > mipscheck fail. The error message appears as
> --
> > > > rld_sbrk: Can't map /dev/zero -- probably not
> > > enough
> > > > virtual memory.
> > > > As I understand its trying to mmap the device
> > > > /dev/zero but since mmap is not initialized &
> > also
> > > not
> > > > implemented, the sbrk fails to map. Please
> note
> > > that I
> > > > am just using lib & lib32. I am not emulating
> > IRIX
> > > > devices. If I add /emul/irix/dev/zero, device
> > > number
> > > > (37, 0), even the O32 binaries mentioned above
> > do
> > > not
> > > > work. For example "uname -a" does not work in
> > this
> > > > case, while it works if I dont add emulation
> > > device.
> > > > Could anybody please help me in trying to
> figure
> > > out
> > > > how to handle this situation?? 
> > > > Many thanks & regards,
> > > > Girish.


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