Board index Linux development

Sparc problem: userspace 32 bit, kernel 64 bit

Sparc problem: userspace 32 bit, kernel 64 bit

Post by bart.de.schuy.. » Wed, 30 Jan 2002 08:24:46



Hello,

I have a kernel module and a user tool that interacts with it. Someone
wants to run this on a sparc and it's not working. Turns out the sparc
has a 32 bit userspace and 64 bit kernel.
The userspace/kernel interaction is done with a "struct info" (and
getsockopt/setsockopt). When I print the size of this struct info I
get 28 for userspace and 40 in the kernel! Ofcourse sh*t happens then.
How to solve this? Is there a compiler option for the userspace
program?
Or do I have to go work with annoying "#ifdef" stuff in my header file
that is used by both kernel and userspace. And if yes, can you say
how?

cheers,
Bart

 
 
 
Top

Sparc problem: userspace 32 bit, kernel 64 bit

Post by Pete Zaitc » Wed, 30 Jan 2002 08:52:35


Quote:> The userspace/kernel interaction is done with a "struct info" (and
> getsockopt/setsockopt). When I print the size of this struct info I
> get 28 for userspace and 40 in the kernel! Ofcourse sh*t happens then.
> How to solve this? Is there a compiler option for the userspace
> program?

There is a conversion code somewhere, try to find it.
It re-marshalls setsockopt arguments.

Quote:> Or do I have to go work with annoying "#ifdef" stuff in my header file
> that is used by both kernel and userspace. And if yes, can you say
> how?

You have to maintain two copies of that on Linux, even if
you only build on 32-bitters. The diff(1) and patch(1) are
your friends. Kernel headers must not be included in applications.

-- Pete

 
 
 
Top

1. Userspaces 32-bit and 64-bit on Solaris Ultra Sparc

Hi guys,

Thanks for your feedback on the performance
issue.

I wanted to know two things about userspaces.

1) How does one know which userspace one is working
on from the $ prompt.

2) Can we run a 64-bit application on a 32-bit
userspace with 64-bit Kernel?

Might be trivial for you guys but it would
really help me out.

Thanks.
ASG

2. What Y2K problems are there with SCO Unix 3.2.4.2?

3. Upgrading from 32-Bit Sparc-Kernel to 64-Bit sparcv9-Kernel??

4. problems to compile X11-Appplications

5. performance of runing 32/64 bit program in 64 bit kernel.

6. changing file copy to support extended attributes

7. 64-bit kernel vs. 32-bit kernel

8. PRINTCAP HAS "SH"(Suppress header) BUT DOES NOT SUPPRESS: HELP.

9. Can I downgrade 64-bit kernel to 32-bit kernel

10. Why is my 32 bit executable faster than 64 bit build on ultra sparc.

11. Solaris 9 installed with 32 & 64 bit supports but boots in 32 bit mode

12. 32 bit driver in 64 bit kernel

13. SBus-based drivers (32-bit vs 64-bit Solais Kernels)


All times are UTC
Board index